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October 29, 2021 Evgeniy Kovalevskiy, MIPT, Moscow, Russia One-day training course in two parts: Part 1. Geological modeling based on geostatistics Part 2. Geological modeling in the light of Deep Oil Theory GeoEurasia, JSC Geological modeling in the light of Deep Oil Theory 1. What is the Deep Oil Theory? Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions The Deep Oil Theory is a theory of deep (abiogenic) oil origin. The author of this theory is considered to be N.A.Kudryavtsev. Initially, being an "organic", Nikolai Alexandrovich independently came to the conclusion about the inorganic origin of oil. Among his main arguments are the presence of oil deposits in rocks with a complete absence of organic matter (including in rocks of the crystalline basement) and almost universal "multi-storey" character of oil deposits. Nikolai Aleksandrovich formulated 1893 – 1971 the "Kudryavtsev's law": «The most important of the regularities is that in all oil-bearing regions, without exception, where oil or gas is present in any horizon of the section, they will be found in all underlying horizons (at least in the form of traces of migration along fractures)» (Kudryavtsev, 1973). Photo – site “wikipedia.org” Supporters and followers of N.A.Kudryavtsev became a significant number of Soviet scientists - V.B.Porfiriev, P.N.Kropotkin, E.B.Chekalyuk, K.A.Anikiev, V.V.Sozansky, V.A.Krayushkin and others. After that, recalling also D.I.Mendeleev, the abiogenic theory began to be called “Russian”. Recently, as part of the mentioned authors are Ukrainians, it has begun to be called "Russian-Ukrainian" (Kenney, 1996). Since 2012, the annual conference "Kudryavtsev Readings (KR)" held at the Central Geophysical Expedition (CGE, Moscow) has become the center of inorganic theory. The initiator of the conference and the permanent chairman of its organizing committee is A.I.Timurziev. Speakers at the KR were and are V.N.Larin, R.Kh.Muslimov, A.I.Timurziev, B.M.Valyaev, V.A.Trofimov, S.A.Marakushev, K.S.Ivanov, G.A.Belenitskaya, V.L.Syvorotkin, V.P.Polevanov and others. The materials of the conference are in the public domain on the website "deepoil.ru". At the same time, it is too early to talk about the universal recognition of the Deep Oil Theory. We, however, will not wait for universal recognition and will try to move forward. Today we will look at what changes will occur in geological modeling in the case of a “victory” of the Deep Oil Theory. Some answers to this question can already be given. About practical significance of our course. Yes, at present the Deep Oil Theory is not supported by special methods and technologies. And today we will not create them. Today we will only assert a new understanding. But this new understanding will allow us to see something different in our data, something that we did not notice in them before. And we will get completely new results, even with the help of quite traditional methods and technologies. We begin with a brief summary of the Deep Oil Theory. Our starting point will be the conferences “Kudryavtsev Readings”. Here are the topics of the Kudryavtsev Readings. The sections of the theory that arose after N.A.Kudryavtsev are highlighted in font color. Hydrocarbon deposits in crystalline basement rocks Explanation of large and super-large hydrocarbon deposits Synthesis of hydrocarbons in the conditions of the upper mantle and lithosphere of the Earth Colocation of naphthide and salt basins The nature of bitumen and coal Association of oil reservoirs with tectonic faults (including 3D seismic data) Hydrocarbons in meteorites, as well as on the planets and satellites of the solar system Replenishment of old deposits Phenomenon of super productive wells The nature of abnormally high formation pressure Data from superdeep wells Chimneys (according to 3D seismic data) Gas hydrate accumulations at the bottom of the oceans Shale oil Hydrogen degassing of the Earth Elemental composition of the Earth and other planets of the solar system Origin of water Each of these points leads to the conclusion about the deep (abiogenic) origin of oil. But which item in this list is the main one? Today we can state that the main item here is "Hydrogen degassing of the Earth". The central place in the Deep Oil Theory is occupied by the hypothesis of V.N.Larin about the hydride composition of the Earth. Moreover, according to V.N.Larin, the deep generation of hydrocarbons is only a small part of a much larger process of hydrogen degassing of the Earth. In this regard, it should be noted the increasing mutual convergence of the "revolutionary" conference "Kudryavtsev Readings" and the much larger conference "Degassing of the Earth". The latter has been going on since 1976. And it can not be called "revolutionary". This convergence is surprising because in the book of N.A.Kudryavtsev there is not a word about the hydrogen degassing of the Earth. Since the hypothesis of V.N.Larin occupies a central place in the Deep Oil Theory, we present its main provisions. Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions In 1975 V.N.Larin published the book "The Hypothesis of Primordial Hydride Earth" Frame from the documentary film "Hypothesis" about V.N.Larin (Hypothesis, 1984) Vladimir Nikolaevich Larin (1939 - 2019) The main provisions of the hypothesis of V.N.Larin (Larin, 2005) First. During the formation of the Earth and other planets of the solar system, the separation of ionized chemical elements in the magnetic field of the protoplanetary cloud took place. The elements were separated according to their ionization potential. The author of this hypothesis is the English astronomer Fred Hoyle. However, it was namely V.N.Larin who confirmed it with actual data. From the mentioned position it follows that the proportion of hydrogen in the composition of the Earth is 4.5% by mass or 59% by the number of atoms. Which is about 1000 times higher than the generally accepted view. Second. The Earth's core consists of superdense metal hydrides (compounds of metals with hydrogen). Third. Currently, the process of hydrogen degassing of the Earth's core is underway, accompanied by decompression and expansion of the Earth. Let us take a closer look at these provisions. Statement 1. Separation of ionized chemical elements in the magnetic field of a protoplanetary cloud The composition of the chemical elements that make up the Sun is well known (Wikipedia, article "Sun"). The main elements are hydrogen (≈73% by mass) and helium (≈25%). The remaining ≈2% of the mass is (in descending order) oxygen, carbon, neon, iron, nitrogen, silicon, magnesium, etc. However, the composition of the protoplanetary cloud in the Earth formation zone (according to V.N.Larin) was completely different. In particular, the proportion of hydrogen (by mass) was not 73%, but only 4.5%, while the proportion of silicon, on the contrary, was as much as 45%. The reason for this difference was that the atoms of chemical elements in the protoplanetary cloud were ionized to varying degrees (depending on their ionization potential), and the Sun's magnetic field worked as a "separator". Neutral atoms (with a high ionization potential, such as hydrogen and helium) could freely move away from the Sun, while ionized atoms (with a low ionization potential, such as silicon, iron, magnesium, and others) could not. Statement 1. Separation of ionized chemical elements in the magnetic field of a protoplanetary cloud Source: Larin, 2005 The fact of this separation is confirmed by the observed dependence of the content of chemical elements on the Earth (relative to their content on the Sun) on their ionization potential. The shown diagram was presented by V.N.Larin at the seminar of the famous Soviet astrophysicist I.S.Shklovsky, where he was “well supported”. Source: Larin, 2005 Consequence: the composition of the Earth according to V.N.Larin Table 1. Source: Larin, 2005. Supplement: Wikipedia, article "Earth" Explanation for the calculation of the separation diagram (text on the next slide) Table 2 (auxiliary) For reference: the ionization potential of helium is 24.7 eV The calculation of the separation diagram (on the left), as well as the calculation of the Table 1 resulting from it, requires explanation. For this purpose we use auxiliary Table 2 (previous slide). The second column of Table 2 shows the composition of the Sun as the number of atoms of chemical elements per one million of hydrogen atoms (Wikipedia, article "Earth"). Consider on the diagram a group of elements with an ionization potential of about 8 eV (iron, magnesium, silicon, and others). Apparently, they were completely ionized and could not move away from the Sun. That is, all these atoms remained in the Earth's zone (fourth column of Table 2). Accordingly, their ratio to the number of the same atoms on the Sun is approximately equal to 1 (shown in the third column of Table 2 and as the vertical coordinate of the symbols of the named elements in the diagram. Now consider elements with an ionization potential of 10-14 eV (sulfur, carbon, nitrogen) in the same diagram. They, as can be assumed, were partially ionized, and some of them could move away from the Sun.The observed number of atoms of these elements on the Earth (in comparison with the elements of the first group) is less by 3-4 orders of magnitude, which is shown by fractional values in the fourth column of Table 2. After that, you can calculate how much the proportion of these elements has decreased relative to their initial content on the Sun (shown in the third column of Table 2) and determine the vertical coordinate on the diagram of these elements. Repeating these arguments, we, knowing the proportions of chemical elements on the Sun and on the Earth, can place all chemical elements on the diagram. And see the dependence that expresses the separation of chemical elements in the Earth's zone according to their ionization potential. The only element that "knocks out" of the general dependence on the diagram is oxygen. V.N.Larin explains this by saying that the oxygen content shown on the diagram (on the Earth relative to the Sun) is overestimated by two orders of magnitude. The high oxygen content in the Earth's lithosphere is extended to the entire Earth composition. If we correct the oxygen content in the Earth's material (as shown by the dotted line), then everything converges. Looking ahead, we can say that hydrogen purging takes all the oxygen into the lithosphere. The main conclusion from the diagram shown concerns the content of hydrogen in the Earth's material. The ionization potential of the hydrogen atom is approximately equal to the ionization potential of the oxygen atom (13.6 eV). That is, relative to the content on the Sun, the number of hydrogen atoms in the Earth's zone also decreased by 10**4 times. But, since it was very large initially, hydrogen (according to Larin) still remains the main (in terms of the number of atoms) element in the material of the Earth. Which is shown in Table 1 (and in the last column of explanatory Table 2). Some discrepancy in the numbers of Table 1 and auxiliary Table 2 is explained by the estimated nature of calculations. The magnetic separation of chemical elements in the solar system is also confirmed by the chemical composition of meteorites from the asteroid belt. In the latter there are more (in comparison with the Earth) elements with a high ionization potential, in particular - carbon, sulfur, gold, mercury, beryllium. And fewer elements with low ionization potential - cesium, uranium, potassium, rubidium. Statement 2. The core of the Earth consists of metal hydrides As a result of magnetic separation silicon, magnesium, iron and hydrogen have become the main elements of our planet. In total they make up more than 90% of its mass. These elements were originally included in the planet in the form of hydrogen compounds - hydrides. An experimental fact when iron condenses in a hydrogen atmosphere, each atom of metal captures two atoms of hydrogen. The interaction of hydrogen with metals proceeds according to the following scheme: • adsorption on the surface; • dissolution in the volume of metal (occlusion); • chemical interaction (hydride formation). Pressure and temperature affect the interaction of hydrogen with metals in the opposite way. An increase in pressure leads first to occlusion and then to the formation of a hydride. Under a pressure of about 60 kbar, all metals saturated with hydrogen are transformed into hydrides. The formation of hydrides occurs with the absorption of heat. The density of magnesium and silicon hydrides at pressures of hundreds and thousands of kbar can be (according to V.N.Larin) 25 g/cm3. An increase in temperature, on the contrary, causes the decomposition of hydrides and the transition of hydrogen first into a dissolved state, and then its degassing. Properties of hydrides of some metals A. Compaction of metals in the form of ionic hydrides at room temperature and atmospheric pressure. B. Compressibility of potassium in the form of metal and hydride in conventional units. The unit is taken to be the density of potassium at zero pressure. Source: Larin, 2005 Density distribution in the mantle and core of the Earth A. Density distribution in the mantle: dotted line - in the light of traditional ideas about the silicate composition of the mantle, dashed line - according to our model. B. Density distribution in the Earth's core: dotted line - in the light of traditional ideas (iron core), dashed line - according to our model. Source: Larin, 2005 Statement 3. At present, the process of hydrogen degassing of the Earth's core is underway, accompanied by the expansion of the Earth At the end of the Archean, the radiogenic heating of the Earth triggered the decomposition of hydrides The internal structure of the Earth at various stages of its evolution: 1. Outer silicate-oxide shells 2. Oxygen-free intermetallic compounds (mainly silicides) 3. Metals with hydrogen dissolved in them 4. Metal hydrides Source: Larin, 2005 Statement 3. At present, the process of hydrogen degassing of the Earth's core is underway, accompanied by the expansion of the Earth The rate of expansion of the Earth in time and the nature of the change in gravity on its surface Source: Larin, 2005 Confirmation of the V.N. Larin hypothesis. About the expansion of the Earth The hypothesis of the Earth expanding appeared and began to develop in the beginning and middle of the 20th century (i.e., long before Larin). The main argument for the expansion of the Earth is the observation that the continents along their contours are able to assemble back into a ball approximately half of the original diameter. Globes by O. Hilgenberg (Wikipedia, article "Expanding Earth Hypothesis"). The inscription in German "Expanding Earth". But it was not clear where, with an increase in volume, the additional mass of the Earth is taken. Larin's hypothesis explains this. The mass of the Earth does not change, the increase in volume is due to a decrease in its density. Confirmation of the V.N.Larin hypothesis. About hydrogen degassing of the Earth As for the hydrogen degassing of the Earth, there is a large amount of data on this. Such data is collected, in particular, by Nikolai Vladimirovich Larin (he is the son, also a geologist). The areas of hydrogen release on the earth's surface have a characteristic shape - the so-called "ring-shaped structures of subsidence". They are found in large numbers throughout the world. Here are ring structures in North Carolina, USA (Zgonnik, Larin et al., 2015). Confirmation of the V.N.Larin hypothesis. About hydrogen degassing of the Earth Ring-shaped structures of subsidence in Central Russia, near Borisoglebsk-Novokhopersk (Larin et al., 2014). In the last article, in addition to Google images, are published the results of two profile surveys carried out by the authors through one of the ring structures. The surveys were carried out using a portable gas analyzer. Hydrogen release was recorded in the center of the structure (Larin et al., 2014). Explanation of the concentration graph: "ppm" means "parts per million". For volumetric concentrations, this is the number of cubic centimeters per cubic meter. An explosive concentration of hydrogen in the air is considered to be from 40,000 ppm. In some cases, the concentration of hydrogen emanated from the earth is so high that it burns. The most famous example of this kind is the burning Mount Chimera near the city of Kemer, Turkey. Many interesting examples of hydrogen emission (including filming on Mount Chimera) are contained in a video recording of the report by Larin N.V. et al., 2016 A large number of photographic materials about signs of hydrogen emanation on the earth's surface were collected by I.A. Dabakhov (Dabakhov, 2018). In particular, according to V.N. Larin, hydrogen outflows can activate karst processes Estimates of the amount of the Earth's hydrogen degassing Estimates of the amount of the Earth's hydrogen degassing vary greatly. There is practically no hydrogen in the Earth's atmosphere. This is due to the fact that it is not held by the earth's gravity and escapes into outer space. In a paper Catling et al., 2009, the Earth’s hydrogen emission is estimated as three kilograms per second. Which is approximately 100 thousand tons per year. V.L.Syvorotkin, relying on his own studies of the dynamics of the ozone layer, estimates the Earth's hydrogen emission as some thousands of terograms per year. Which is equal to several billion tons per year (Syvorotkin, 2013). V.N.Larin gives an estimate of 300-500 billion tons per year (Larin N.V. et al., 2016). For comparison, the total oil production on Earth in 2014 amounted about 4.4 billion tons (BP Annual Report, 2015). Vladimir Larin: The Earth's hydrogen emission is from 300 to 500 billion tons per year Source: Larin N.V. et al., 2016 Completion of the introductory part and transition to the main topic Hydrogen emission of the Earth, occurring, judging by many facts, in huge volumes, explains not only the origin of oil, but also the origin of water. As for oil, V.N. Larin himself believed that learning how to produce hydrogen is much more important than learning how to produce deep oil (Larin, 2005). But we, at least today, continue to produce oil. Therefore, we stop considering hydrogen emissions and move on to our main topic - deep oil. Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions A brief summary of the results of the "Kudryavtsev Readings" First. The main difference between organic and inorganic theories of oil generation is in the scale of oil generation. The scale difference can be estimated as the ratio of organic and inorganic matter in the Earth's material. The order of this ratio is one to a billion. That is, if the inorganic theory is true, then oil on Earth is one billion times more. See, for example, Sozansky, 1989. ……. From the standpoint of the deep inorganic origin of oil, its reserves on the globe should be huge, incomparable with those following from the organic hypothesis. So, according to the scheme of organic oil formation, the amount of oil that the entire organics of the globe can produce can be represented in the form of a 2.5 mm thick layer uniformly covering the surface of the Earth. In the case of the inorganic nature of oil, such a layer would be 10 km /14/, and thus the amount of oil on the globe, according to the inorganic theory of oil formation, is several million times higher than the reserves arising from ideas about its organic nature. A brief summary of the results of the "Kudryavtsev Readings" Second. As “inorganics”, we can conclude that modern giant fields (Gulf of Mexico, Tengiz, Samotlor, Romashkinskoye and others) should be considered only as prospecting signs of hydrocarbon generation zones and supplying channels, since under these fields they are definitely there. See, for example, Ivanov, 2018. …….. Where is it possible (and where is absolutely needless) to look for deep oil? ... ideas about the inorganic nature of oil give a very high probability of multi-storey deposits within oil fields, especially large and super-large ones. Therefore, the primary prospecting objects are the lower horizons of the sedimentary cover and the basement within the oil fields, especially with large deposits. A brief summary of the results of the "Kudryavtsev Readings" Third. About the supplying channels. It should be something like vertical faults or finger-like structures extending from the mantle (the upper boundary of the asthenosphere under the continents lies at a depth of about 100 km) to traditional natural reservoirs at depths of 2-5 km. And these channels, due to the scale and wide distribution of this phenomenon, should be known to us. What could be the search feature of such channels? Here we make a third conclusion. Since the channels come from the depths, that is, from the areas with high temperatures and pressures, their search feature is the well-known to us abnormally high formation pressure. See, for example, Anikiev, 1971. ... In general, there is a pulsating hindered vertical migration of high-pressure oils, gases and waters through the covers, especially along the weakened zones and along the zones of conductive faults. Consequently, abnormally high formation pressure reflects the ultra-high pressure of fluids periodically breaking through into the closed floors of deposits from deeper depths, as well as tectonic dislocation pressures compressing relatively closed elastic accumulations of fluids inside the seals [Anikiev, 1964; Dvali, Anikiev, 1966]. 5. Abnormally high formation pressure emerges as a result of the rise of deep fluids into the sedimentary cover, which are released in the process of differentiation and degassing of the Earth's mantle matter; moreover, the isolated mobile phase, which at a given depth has a pressure value close to geostatic, is able to create paths for itself to rise to the overlying horizons [Kropotkin, Valyaev, 1965]. What general conclusions can we draw from the materials of the Kudryavtsev Readings regarding the upcoming changes in geological modeling? There are two general conclusions: 1. Geological models will be built at great depths (up to several tens of kilometers). Their structure becomes more complex. 2. The objects of modeling, along with the reservoirs, will be the supplying channels. Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions In the most general, fundamental terms, a clear association of oil and gas bearing and saline basins of the world attracts attention (Belenitskaya, 2013). 1 - Mexican 2 - Caspian 3 - East Siberian 4 - West and East mediterranean 5 - Atlas-Northern Sahara, 6 - Atlantic 7 - Central European (North Sea) 8 - Persian Gulf 9 - Amu Darya 10 - Canadian Arctic archipelago 11 - Eastern Brazilian 12 - Western Canadian 13 - Kwanza Cameroon 14 - Krasnomorsky 15 - West Texas 16 - Pripyatsko-Dneprovsky 17 - Ciscarpathian 18 - Amazonian 19 - Sverdrup The inorganic theory explains this association by the joint upward migration of brine-salt masses and deep hydrocarbon systems from the bowels of the Earth (Marakushev et al., 2013). At the same time, G.A.Belenitskaya calls incomparably more voluminous and much denser salt masses “rams” that pave the way for deep hydrocarbons through impermeable covers. A.A.Marakushev and S.A.Marakushev (2013) indicate a possible joint synthesis of hydrocarbons and salts in the presence of hydrogen under conditions of the upper mantle. According to the above authors, salt-hydrocarbon paragenesis can be expressed by the following generalized reaction (to which we will return later): Geologo-mineragenic profile through the Pre-Caspian salt dome basin (Belenitskaya, 2013) Illustration and caption G.A. Belenitskaya. Symbols: 1 - cover complex (N2-Q); 2 – post-salt complex of terrigenous and terrigenous-carbonate deposits (Р2-N1); 3 – Kungur halogen formation of sulfate-potassium type (P1k) with deposits and manifestations of rock and potash salts; 4−6 - subsalt Upper Paleozoic (pre-Kungur, D-P1) sedimentary complex, deposits: 4 carbonate-reef, shelf, 5 - clayey-siliceous-carbonate Domanic type, deep water, 6 - essentially terrigenous; 7 - Riphean-Lower Paleozoic pre-plate terrigenous-carbonate complex of increased density (R-PZ1); 8 – “granite” layer; 9 – “basalt” (granulite-mafic) layer; 10 - upper mantle; 11 – deep faults (a) and thrust zones (b); 12 - fold-thrust complexes of the Urals; 13−16 - position of deposits and manifestations: 13 - bischofite, 14 - native sulfur, 15 - borates, 16 - gas sulfur; 17 - generalized intervals of oil and gas content. Submeridian profile of the Mexican salt dome basin (Belenitskaya, 2013) Illustration and caption from G.A.Belenitskaya. The stratigraphic base is modeled after McBride B., 1998. Symbols: 1 - salts: at the base of the sedimentary section - parent salts of Loanne, in the upper part in the composition of the Neogene-Quaternary deposits - allochthonous salt covers, torn off from parental salts; 2 - area of established oil and gas content (a, line above the profile) and the total interval of established and probable oil and gas content (b); 3 - the area of established modern intensive development of ascending discharges of oils, gases, brines, mud volcanoes, gas hydrates, and in the underlying section - salt and clay diapirs and multilevel hydrocarbon deposits; 4 - wells; 5 - approximate projections on the well profile: a emergency Deepwater Horizon, 2010, b - emergency 1 and 2 on the northern coast of the bay, c - Challenger-1, 1968, d - wells Jack (D) and St. Malo (S-M), exposed subsalt (undercover) oil and gas deposits on the continental slope; 6 – approximate position on the profile of the deep-water brine lake Orka; 7 - area of distribution of native sulfur deposits in caprocks of salt domes (Texas-Louisiana sulfur-bearing province). The main types of hydrocarbon deposits characteristic for traps associated with diapiric structures (Belenitskaya, 2013) Conclusion: the association of deposits with tectonic faults and salt diapirs is not accidental and requires the development of powerful structural modeling tools 1 - reservoir (oil and gas) horizons; 2 – salt stock; 3 - caprock; 4 - deposits of hydrocarbons; 5 - tectonic faults, arrows - directions of displacements; 6 - unconformity surfaces Modeling of faults. Salt diapir modeling is a more difficult problem Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions There are no words "supplying channels" in N.A.Kudryavtsev's book (there are only the words "vertical migration"). The term "supplying channels" appeared later. First of all, should be noted the work "Oil supplying channels: spatial position, methods of detection and methods of their activation" (Trofimov, Korchagin, 2002). Here is a quote from the titled work: “The actual oil supplying channels have not yet been discovered, despite the fact that their existence is confirmed by a number of fairly convincing, in our opinion, evidence (Korchagin, 2001). One of the most compelling arguments is the very long life of a number of oil fields sometimes this period lasts more than 100 years. These are the deposits of the Baku group in Azerbaijan (Subanchi, Bibiheybat), some deposits of the North Caucasus, Fergana (Mailisu, Selrokho, Izbaskent), Western Turkmenistan (Cheleken). In the old oil and gas regions, at the later stages of development, the production level decreases to 20-10% of the maximum and stabilizes. At this level, the volume of oil produced, obviously, was balanced by the inflow of new fluid portions through the channels. Further, the authors, considering the fields of Tatarstan, note the following criteria and prerequisites for determining the position of oil supplying channels: 1. Oil supplying channels are almost certainly within the area of the field itself, and they are vertical or sub-vertical. 2. The active or passive state of the channels usually manifests itself at a late stage of field development. At this stage, in fields where fluid inflow is expected, there are wells with increased total production and relatively high flow rates. In some cases, this fact can be explained by the structural features of the deposit itself. But of interest are those wells with anomalous productivity that are not related to the structure of the deposit. Their increased productivity and flow rates are probably due to their proximity to an active canal that feeds the field. 3. The oil that has filled the trap becomes heavier and more viscous over time, while the oil entering directly through the channel is lighter and less oxidized. Differences between the quality of oil coming directly from the channel and the oil that previously filled the trap can be quite significant and, therefore, can be detected by existing laboratory methods. In this case, one of the ways to determine the position of the oil supplying channel within the reservoir is to analyze the qualitative composition of oil in production wells. The authors (Trofimov, Korchagin, 2002) make the following prediction: “In the near future, we can expect the emergence of detailed seismic methods, as well as other geophysical methods, with which it will be possible to identify oil supplying channels.” And so it happened (see below). Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions Of great interest from the perspective of Deep Oil is the relatively recent discovery of so-called "chimneys". Connolly et al. (2008) learned how to detect hydrocarbon upflows in stacked seismic trace cubes from standard 3D seismic. Flow detection is performed using a neural network. The authors refer to the detected fluid flows as "seepage". They show that seepage very often follows tectonic faults. What is new and very important is that the proposed technology indicates which parts of the fault are migration routes and which are not. . Time slice. An overlay of two seismic attributes, each obtained using its own neural network. White color attribute "faults". The green to yellow color is a "chimney probability" attribute (Connolly et al., 2008). Gulf of Mexico. The interpreted amplitude cube is overlaid with the chimney probability attribute cube (Connolly, 2017A) Chimneys in a cube of stacked seismic traces (Singh et al., 2016) A large number of publications by Connolly et al. and their followers show that there are chimneys almost everywhere where there are oil fields Chimneys are found almost everywhere where there are oil fields Map from the site “https://dgbes.com/chimney_atlas/“ The “seepage” identified by the neural network corresponds well with areas of anomalous seismic amplitudes North Sea. On the left is a vertical section of the seismic trace cube after standard processing. On the right, the same with the “chimney probability” attribute overlaid (Connolly, 2017B). Most surprisingly, in demonstrating hydrocarbon upflows, Connolly et al. remain supporters of the organic theory. We ask them a simple question: "Where do the chimneys start?" They say that hydrocarbon migration goes “from deep thermally mature source rocks” (Connolly et al., 2008). But in all of the examples they showed, the primary sources of chimneys are not visible. You can always see the flow from below. Connolly et al. confirm the Kudryavtsev's law. As has just been said, chimneys correspond with dynamic anomalies in seismic amplitudes. On the materials of the unique “Tatseis” profile (record length 20 seconds, sampling 4 ms) chimneys (according to the method of Connolly et al.) were not explored. However, dynamic anomalies of seismic amplitudes are observed deep in the basement at depths of about 20 km (illustration on the right). Trofimov, 2014 Connolly et al. (2008) write "Gas chimneys are a means by which deep pressures can be transmitted into the shallow subsurface". Thus, they give the true answer to the question "Where do the chimneys start?". The outflow of hydrocarbons occurs from zones of abnormally high formation pressures. Conclusion: the detection of "chimneys" will become an indispensable part of the processing and interpretation of seismic survey data. Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions Studying the topic "Deep oil" one cannot ignore such a phenomenon as super-productive wells. G.A.Belenitskaya was one of the first to write about such wells in this context. We are talking about wells that unexpectedly showed fantastically high production rates (about 10,000 tons of oil per day or more). Which, as a rule, led to accidents and even catastrophes. Source: Belenitskaya, 2011 (fragment) More recent disasters (Well 37 at Tengiz and the Deepwater Horizon oil platform) are described in detail. There is every reason to say that emergency events were caused by wells entering the zone of a combination of two factors - abnormally high formation pressure (first) and high permeability (second). This combination is a sign of the supplying channel. As is known, normal reservoir pressure is close to hydrostatic pressure. It is determined by the fluid pressure, which is taken as, for example, mineralized water with a density of 1.05 g/cm3. During well drilling, formation pressure is balanced by drilling fluid pressure. As for rocks, they do not make any contribution to reservoir pressure. For example, when drilling the Kola superdeep well at a depth of more than 10 thousand meters, a drilling fluid with a density of 1.12 – 1.15 g/cm3 was used (Kola Superdeep, 1984). At the same time, when drilling wells (and more often at large depths), zones with abnormally high formation pressure are found. The anomalous coefficient Ka (which is the ratio of pressure to normal hydrostatic pressure) can reach two units or even more. Two alternative views on the nature of abnormally high formation pressure Above, a view on the nature of abnormally high formation pressure, shared by supporters of енить the inorganic theory, was outlined. "Organics" believe that abnormally high formation pressure is the result of rock compaction. The difference between the two mechanisms for the formation of abnormally pressure is the duration of the process. If in the first case the process occurs, by geological standards, instantly (as a breakthrough of high-pressure fluids, with the formation of a highly permeable channel), then in the second case it proceeds gradually and takes many thousands of years. But a pressure anomaly that persists for many thousands of years is nonsense. In thousands of years, any such anomaly will disappear due to the microscopic permeability of rocks, which is always exists. Risk factors when drilling in the abnormally high formation pressure zone Let us name three factors, the combination of which makes a disaster during drilling in the abnormally high formation pressure zone almost inevitable: 1. Drilling depth of 4000 m or more. 2. Pressure anomaly coefficient Ka equal to 1.7 or more. 3. High reservoir permeability. This paradoxical combination - abnormally high formation pressure and high permeability is a sign of a supplying channel. And it is also a condition for a catastrophe. An unexpected hit of a bit in a high permeability zone causes heavy drilling fluid to getting out into the formation, replacing it in the wellbore with a relatively light formation fluid and subsequent avalanche-like disturbance of hydrostatic equilibrium in the wellbore. In a matter of minutes, pressure equal to the difference between hydrostatic and formation pressure (recall that at a depth of 4000 m with Ka equal to 2.0 this difference is 400 atmospheres) comes to the wellhead. And disaster strikes. Risk factors when drilling in the abnormally high formation pressure zone Consider, in the light of this understanding, two well-described catastrophes Disaster at Well 37 of the Tengiz field Location of the accident Disaster at Well 37 of the Tengiz field Frame: Ak Beren, Professional Militarized Emergency Rescue Service, Kazakhstan Disaster at Well 37 of the Tengiz field The description of the catastrophe is given in the book "Fiery Year (a diary)" (Igrevsky, 1995). We read on page 9 and further: “... well No. 37-Tengiz has a bottomhole at 4467 m. A 245-mm intermediate column is cemented at a depth of 4403 m. During boring, drilling fluid with a density of 2020 - 2040 kg/m3 was absorbed ... The well absorbed at 20:06 on 24.06 .85 (local time) and began to kick into the annulus, then into the pipes. They screwed a pipe with a ball valve, which took 20 minutes due to disorganization. The valve could not be closed… The height of the fountain through the drill pipes is 15-20 m… It was decided to start plugging and try to close the ball valve… In total, 65-70 m3 of drilling fluid remained to be pumped until the plug approached the bit… When a loud bang was heard, he saw how ... a stream of fire was running. Instantly there was a strong explosion… The count of people showed that everyone was alive…”. Page 99, about the flow rate of the emergency well: "... the flow rate of products (oil + gas) is 10.8 thousand tons per day." End of citation. We see that the scenario described above has been realized. The well was extinguished for 400 days. No reduction in emergency flow rate was observed. Deepwater Horizon explosion Location of the accident Deepwater Horizon explosion Photo: Popular Mechanics magazine, November 2010 Deepwater Horizon explosion The description of the catastrophe is given in the publication (Final Report …, 2011). Let us go over the most important details. Page 19. Six months before the disaster, the Deepwater Horizon platform successfully completed the drilling of the world's deepest oil well in the Tiber area, with a total depth of 35,000 feet (10,668 m), with a sea depth of about 4,000 feet (1,219 m). Page 29. A well in Macondo Square (this is about a disaster) was drilled to a depth (from sea level) of 18360 feet (5596 m). Which was approximately 13,000 feet (3,962 m) below the seabed. Drilling has been completed. It remained to perform a series of final operations, after which the drilling platform was about to leave. Page 28. The density of the drilling mud was 14.17 ppg (1.7 g/cm3). That is, the drilling of the well took place in the conditions of abnormally high formation pressure. Page 38. After bottomhole cementing, a two-stage overpressure test was performed (successfully). However, later it was concluded that the test was carried out prematurely, before the time required for the cement to fully set had elapsed. Page 41. A test for depression was performed. The result was not positive, a leak was detected. The depression test was repeated. A minor leak was detected. At the end, the result of the depression test was considered as successful. The final operation was started - pumping out the heavy drilling mud from the wellbore and replacing it with sea water. When filling the well with sea water, formation fluids burst into the well, which led to a disaster and the death of the platform. We see that the scenario described above has been realized. The flow rate of the emergency well was, according to various estimates, from 60,000 to 100,000 barrels of oil per day (from 8,200 to 13,700 tons per day). In the two cases described, emergency wells were tried to be plugged as soon as possible. Considering them (primarily) as environmental disasters. Nobody was interested by phenomenon of super production of these wells. We did not learn anything about what was the nature of this super production, how long it could have continued, how it would have ended. In this regard, two similar cases dating back to the beginning of the 20th century are of great interest. At that time, no one tried to stop emergency wells, despite the approximately equal scale of environmental disasters. Thanks to this, we saw how it all ended. Lakeview Gusher (California, 1910-1911) … A roaring column of sand and oil twenty feet in diameter and two-hundred feet high gushed into the air, and issued a stream of oil at its base, dubbed the "Trout Stream" which flowed down every adjacent ditch and gully. Rather than diminishing in force, the gusher grew stronger each day and eventually buried the engine house in a mountain of sand. Although the wooden derrick remained standing a few weeks longer, eventually it too, and all the drilling equipment as well, were completely swallowed up by a huge crater that formed around the drill well. … Lakeview's roaring and spouting began to be measured, not in days, but months. It seemed little discouraged by the feeble efforts of humans to control it. Besides the labor of holding the oil, there was constant anxiety and fear. Adjacent landowners sued. Workmen cursed the sticky flood and labored in fear that spray from the well, carried on the wind for up to ten miles, could cause accidental fires. Preachers and their flocks prayed that oil might not cover the earth and bring about its flaming destruction. The entire oil industry wilted as this seemingly inexhaustible fountain brought crude prices down to 30 cents a barrel. Even Union Oil Company, with endless lawsuits, labor bills and low-priced crude on its hands, began to despair of having made the "richest" oil discovery in history. … When the bottom of the hole caved in on September 10, 1911, the well died. Although Lakeview No. 1 produced 9.4 million barrels during the 544 days it flowed, less than half of this oil was saved-the rest evaporating off or seeping into the ground. End of quote. Attempts to open the channel for the second time failed. What shows - it was vertical and came from a great depth. Sources: Text - San Joaquin Geological Society Photos - Wikipedia, article «Lakeview Gusher» Potrero Del Llano-4 (Mexico, 1910-1918) … In fact this was one of the biggest wells anyone anywhere in the world had ever worked on. Through the dark hours of Tuesday morning its terrific roar and gas (carbon dioxide, methane, hydrogen sulfide, butane, and propane) spread fear among the men in the camp that the entire field would explode. The night sky rained hot oil and chunks of hard, white, flinty limestone. The air because heavy, foul. By the early light the great gusher was finally visible. From up on the hillside, oil rain soaking into their skin, the constant roar in their ears, a choking stink in their nostrils, heads aching, eyes burning, the men saw an 8-inch column of black oil rising from No. 4 some 230 feet into a gigantic black plume of spray 425 feet high. Only parts of the derrick and rigging still stood. The bull wheels lay broken in two, blown from the floor 24-30 feet away. Oil slick covered everything for a mile around, and oil streams were running into the reservoir and down into the Buena Vista, covered from bank to bank by oil on its way down to the Tuxpan River and on to the Gulf. Measured later, the pressure at the casing head was 850 psi; the oil’s temperature, 147º. The pressure estimated in the pool 1,911 feet below was 1,555 lbs… The same day Águila’s general manager arrived. He calculated the well’s flow then at “over 100,000 barrels in 24 hours” … Source: Womack, 2004 Potrero Del Llano-4 (Mexico, 1910-1918) … Potrero went completely to salt water at the end of 1918, after producing almost 100 million barrels. Source: Gerali, Riguzzi, 2016 Thanks to Potrero Del Llano-4, we have seen what oil production from the supplying channel could be. We also said that during the mantle synthesis of hydrocarbons, salt and water can form. Photo: Petroleum History, 2016 Let us summarize the interim Above, we named five types of evidence indicating that the supplying channels are a reality (very long life of a number of oil fields, differences in quality of oil within the same field, chimneys, abnormally high formation pressure, super-productive wells). Can supplying channels (rather than reservoirs) be the target of well drilling? As we see, with the current technical level of drilling, this is dangerous. But they can (and should) become objects of research using seismic methods. First of all, we are interested in such a repeatedly mentioned search feature of channels as abnormally high formation pressure. Seismic exploration by the method of reflected waves does not see these abnormally zones. But they should be visible by passive seismic exploration, since these zones are sources of microseism. Further, from the viewpoint of deep oil, we will consider what are the real possibilities of passive seismic exploration. We will cite papers containing detailed descriptions of observation systems and the results obtained. Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions In oil and gas exploration, the following two types of passive seismic survey methods are used: 1. Analysis of the spectrum of natural seismic noise. Non-synchronous short-term recording of seismic noise at multiple points of the study area is used (Arutyunov et al., 1997, Dangel et al., 2003). An oil deposit changes the spectrum of seismic noise. 2. Location of subsurface emission centers of natural seismic noise. Synchronous long-term registration of seismic noise by a large number of receivers is used. Since we are interested in supplying channels (zones of abnormally high formation pressure), we will talk only about the second type of methods, i.e., the localization of underground emission centers. These technologies have long been well developed. First of all, in seismology (Chebotareva, 2010). Recently, they have been widely used in connection with the problem of hydraulic fracturing control (Alexandrov et al., 2015). And finally, they have already begun to be used for the purpose that we are talking about - to identify highly permeable vertical fluid flow channels in hydrocarbon deposits (Chebotareva, 2010, Kuznetsov, etc., 2016). Processing of data from seismic earthquake monitoring stations Layer-by-layer horizontal images of the lithosphere under the KNET network according to seismic noise records for depths 0-150 km (P-waves), preliminary frequency filtration in the band 0.1-2 Hz. The Kyrgyz seismological network KNET (created with the participation of the Russian Academy of Sciences) consists of 10 wide-range seismic stations located along the northern border of the Tien Shan and the Kazakh platform. Source: Chebotareva, 2010 Sources of seismic emission in an oil field (Chebotareva, 2010) The processing of records of natural noise seismoacoustic field in an oil field is described. The monitoring system consisted of 60 vertical sensors located in boreholes 5-7 m deep. (Records of 20 sensors out of the 60 named were rejected.) The geophones were placed in two areal groups, the maximum aperture was 3 km. Registration was continuous with a sampling rate of 2 ms. Several time intervals of 100 seconds each were selected for processing. The images of sources in the subsurface space of a cubic shape with an edge length of 6 km were calculated. On the left - area of field observations. Triangles mark the position of the receivers, circles - the position of the wells. On the right - images of emission sources in the subsurface space of a cubic shape. The picture allows interpretation in terms of "supplying channels". Average energy of microseismic emission (Chirkin et al., 2014) Observation area 14 km2, depth interval 2700–3300 m. Average energy of microseismic emission over 48 hours of continuous monitoring of the seismic wave field using the SLOE technology Monitoring of hydraulic fracturing (Aleksandrov, 2016). Epicenters of microseismic events Monitoring of a multi-stage hydraulic fracturing in a horizontal well at a depth of about 2400 m. The ground-based observation system included 52 three-component sensors installed in pits up to 0.5 m deep. The aperture size was 800x500 m. Observations continued continuously for 18 days, the recording was with a sampling rate of 1 ms. Data processing consisted in locating emission centers in 3D space. The area of induced microseismic activity (in projection onto the horizontal) covered an area of approximately 350x300 m Listening to the underground space with a 3D land seismic system Of great interest is a new method of passive seismic survey - listening to the geological environment by a 3D ground seismic survey system without the use of explosive or vibration sources (Lacazette et al., 2013, Sicking, Malin, 2019). The initial premise of the authors is that a fragile and fractured geological environment is in a stressed unstable state, such that even minor external influences (such as changes in atmospheric pressure or tidal forces) cause seismic emission from the fracture area. The registration time of natural noises can be several minutes, hours or even days. After that, the records are analyzed and the intervals with the least man-made interference are selected. The processing consists in the fact that for each elementary volume of the medium, the intensity of the signals outgoing from it is accumulated. Focusing the trace data (Sicking et al., 2015) The traces are focused sequentially for each elementary volume of the medium. The focusing lies in the fact that, using the velocity model of the medium, the travel times of the wave from the considered volume to each receiving device are calculated. After that, appropriate time corrections are introduced into the seismic traces. As a result, the hyperbolic hodographs of seismic events are aligned into horizontal lines (lower right), along which the amplitudes are summed (see the next slide). The number of receivers in one of the examples is 4650 Signal Intensity Accumulation Algorithm (Sicking, Malin, 2019) Amplitude summation is performed in two stages. First, by receiving points along horizontal hodographs for fixed moments of time, then by time within the specified time window A fragment of the cube of the accumulated intensity of seismic emission (Sicking, Vermilye, 2019) Fracture selection (Sicking, Malin, 2019) On the left - a picture before hydraulic fracturing On the right - a picture after hydraulic fracturing Fracture surfaces (Lacazette et al., 2013). Illustration from the presentation of the report Fracture surfaces are computed as ridges in the cube of the accumulated intensity. The edge of the cube is 2000 feet, the top of the cube is at a depth of 3500 feet. The calculation is done in the vicinity of a horizontal well Fracture surfaces in the reservoir volume (Copeland, Lacazette, 2015) Mapping of supplying channels by passive seismic methods Geological Modeling in the Light of Deep Oil Theory 1. Deep Oil, what is it. Conferences "Kudryavtsev Readings" 2. Hydrogen degassing of the Earth 3. Summary of the conferences "Kudryavtsev Readings". An overview of the upcoming changes in geological modeling with respect to oil and gas prospecting 4. New requirements for structural modeling 5. New target objects - supplying channels 6. Discovery of "chimneys" in the cube of stacked seismic traces 7. Disasters at oil fields as a search sign of supplying channels 8. About mapping of supplying channels by passive seismic methods 9. Resume and conclusions Conclusions ● Geological models will be built to a great depth (up to several tens of km). Their structure will become more complicated. ● The objects of modeling, along with the reservoirs, will be the supplying channels. ● Detection of "chimneys" will become a mandatory part of processing and interpretation of reflection seismic data. ● The use of passive seismic survey methods to map the supplying channels will be expanded. Unlimited depth of passive seismic survey methods will be used. ● Processing the materials of the Tatseis profile using the chimney detection method will make it possible to find out whether the anomalies of seismic amplitudes visible on this profile (at depths of up to 20 km or more) show channels for hydrocarbon inflow. Conclusions (continued) ● The combination of passive seismic survey and standard 3D land seismic is an extremely constructive idea. Firstly, because the oil reservoir (the target object of reflection seismic) is also a search sign of the oil supplying channel (which is the target object of passive seismic). Secondly, with minimal additional costs a powerful and well-developed 3D land seismic observation system is used for passive seismic. Thirdly, when processing passive seismic survey materials, we can use a velocity model obtained from reflection data. Fourth, you can immediately check whether the vertical fractured zones are chimneys (and vice versa). Fifth,... ● It is better to study channels where they are most developed. We have clues - several wells in the world with super production. The most informative may be passive seismic observations (better in combination with 3D reflection seismic) in the area of emergency well 37 of the Tengiz field (Kazakhstan). Or in Russia, at the site of a similar disaster near the village of Uritskoye, Saratov Region (see the supplement). ● Channel mapping will enable planned drilling of super productive wells. Supplement. Disaster near the village of Uritskoye, Saratov Region (1959-1962) Location of the accident Supplement. Disaster near the village of Uritskoye, Saratov Region (1959-1962) Crater from a well explosion. Source: Vince, 2019 Supplement. Disaster near the village of Uritskoye, Saratov Region (1959-1962) Crater from a well explosion. Source: Tourist Saratov, 2019 Supplement. Disaster near the village of Uritskoye, Saratov Region (1959-1962) Crater from a well explosion and scorched earth beyond Supplement. Disaster near the village of Uritskoye, Saratov Region (1959-1962) … there were planned drilling operations. The entire brigade of oil workers knew that on May 17, 1959, the drill would enter the productive formation. The pressure spat out the drill pipes, then the well pipes. Within a few hours there was a collapse. Earth, together with the well and the equipment, failed ... an uncontrolled release of oil, hydrogen sulfide water and gas began, the column was more than 40 meters. Small oil fountains were hammered all over the surface of the earth. The drillers were frightened, abandoned all their tools and equipment and ran away ... there was a plan to push concrete slabs onto the well, then they tried to drill pits and pump water with cement into them. Nothing succeeded. The problem was in the huge pressure, it was impossible to approach the well because of the fire ... … On one side of the crater, traces of a dam are visible, which was supposed to stop the oil spill. The defensive structures could not withstand the pressure. This is evidenced by the scorched earth outside the funnel. The soil resembles volcanic ash, and melted stones are found in it. Black bald spots stretch to the ravine leading to the Medveditsa River. A kilometer from the crater, the ravine is blocked by four earthen dams. Judging by the state of the embankments, they also broke through. We assumed that the oil from the well accumulated in natural storage for a long time, then went into the river ... … An explosion was heard 7 kilometers from the village where the derrick was located. Then they saw a fountain of oil pour into the sky. He was about 40 meters high. A few days later, a fire started there. The column of fire was observed for 3 years, until May 1962 … ... About half a million tons of oil went into the ravine and the Medveditsa River in 3 years. More burnt... Source: Vince, 2019. ... In search of natural gas, prospecting geologists drilled a well at a great depth. Suddenly, quite unexpectedly, a powerful fountain of water burst out of the ground. This was followed by a dull underground rumble. A dirty green column of water with a pungent odor rose high above the steppe. All drilling equipment, along with the heavy winch, instantly disappeared into the gaping abyss. Streams of poisoned bitter-salty water rushed rapidly to the Medveditsa River, which supplied water to the surrounding villages. The river could be poisoned. It was necessary to take urgent measures. Collective farmers built eight large dams in the shortest possible time. With their help, it was possible to divert the harmful flow to the side. The river has been saved. The fountain, throwing twenty-two thousand cubic meters of water a day, gradually subsided. But several days passed and the underground element raged again. A deafening explosion was heard over the steppe, after which giant flames burst out of the well. The fire spread more and more, and soon there was no trace of the well. Instead, there was a huge crater, spewing flames, with a diameter of up to two hundred meters. It was impossible to put out the fire by conventional means. His hearth was deep underground. Then they decided to drill five wells from different sides to the hearth and through them, under high pressure, bring jets of water, which would eliminate the fire. It was an extremely difficult, dangerous and unprecedented work in drilling practice. We had to act at a distance of no more than two hundred meters from the fire, in very hot air. People poured water on each other all the time so that their clothes would not catch fire. This heroic work has led to success. The flame gradually began to decrease, and then completely subsided. But for a long time thick clouds of steam, mixed with harmful gas, hovered in the sky. It was lit by rockets and thereby neutralized ... Source: Tourist Saratov, 2019. References Aleksandrov V. M. Application of the microseismic monitoring method in problems of oilfield geology // Tyumen: TIU. - 2016. - 93 p. [in Russian]. Aleksandrov S.I., Mishin V.A., Burov D.I. 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