Download 5-12-E-m

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Document related concepts

Plate tectonics wikipedia , lookup

Black Sea wikipedia , lookup

Post-glacial rebound wikipedia , lookup

Large igneous province wikipedia , lookup

Mantle plume wikipedia , lookup

Transcript
«ГЕОФИЗИЧЕСКИЙ ЖУРНАЛ», № 5, Т. 34, 2012
On the prospects of discovery of massive occurrences of hydrocarbons in heterogeneous traps
in the Black Sea
 V. I. Starostenko, A. E. Lukin, O. M. Rusakov, I. K. Pashkevich, R. I. Kutas, V. V. Gladun,
T. V. Lebed, P. Ya. Maksimchuk, O. V. Legostayeva, I. B. Makarenko, 2012
Due to well known economical and ecological reasons it is advisable to direct geological
prospecting and geophysical exploration, particularly in the Black Sea mega-depression towards
searching for considerable hydrocarbons fields within massive pools. The main prospects for
discovery of such major and gigantic oil and gas fields are related to: deep faults, disintegrated rocks
of basement (and also intermediate complex); biocarbonate buildups of different age reef-carbonate
Mesozoic and Cenozoic complexes and heterogeneous reservoirs (traps) related to their paragenetic
junctions. Availability of certain geodynamic, tectonic and oil-gas bearing analogies between
different segments of the Black sea region and the South-China sea (specifically, the Vietnamese
shelf where such well known fields as White Tiger, Dragon and other related to granite uplifts and
draping sedimentary complexes), the peculiarities of Black sea well-known knowledge of gas
regime (unprecedented intensity of gas flow through the sea bottom, huge methane accumulations in
gas-hydrates and its unique amount in water-dissolved state), together with interdisciplinary
geologic-geophysical investigations allow us to make high assessment of its hydrocarbon potential
and prospects for discovery of significant fields within massive pools.
Anomalous geomagnetic disturbances, induced by catastrophic tsunami producing
earthquakes in the area of Indonesia
 L. E. Sobisevich, A. L. Sobisevich, K. H. Kanonidi, 2012
Analysis of geomagnetic variations registered by the stations of the North-Caucasian geophysical
observatory (the Elbrus volcanic area) has been fulfilled. Anomalous “quasi-harmonic” magnetic
disturbances have been distinguished which were observed during all the stages of development of
catastrophic tsunami-producing earthquakes in the area of Indonesia and morphologic effects in
variation structure of geomagnetic field of the Earth have been described. Experimental results cited
permit to obtain general idea on geomagnetic activity and some features of induced geomagnetic
disturbances which we refer to tsunami-producing earthquakes. In all the observed cases seismic
events occurred under the conditions of specific ratios between the components of magnetic field; it
has been found that in the structure of magnetic variations we succeeded to distinguish ultra-lowfrequency quasi-harmonic wave forms of geomagnetic disturbances reflecting the conditions of
preparation and development of tsunami-producing earthquake in the studied region. We do not
consider in the paper the forecast of tsunamiproducing earthquakes because even if we can
distinguish in geomagnetic field some specific indications, in the source preceding the start of
seismic event its coordinates and time in the source are left uncertain so far.
Lithosphere structure of the Black Sea according to the results of 3D gravity analysis and
seismic tomography
 T. P. Yegorova, V. S. Gobarenko, T. B. Yanovskaya, K. P. Baranova, 2012
3D gravity analysis and local seismic tomography have been performed to study the lithosphere
structure of the Black Sea. Due to gravity analysis gravity effects of different layers and levels of the
model (sea water, four layers in sediments, consolidated crust) have been distinguished and residual
gravity anomalies of mantle origin have been obtained. Long-wave component of these anomalies
forms the vast area of positive values with small amplitude that indicates good isostatic balance of
deep structures of the Black Sea. Velocity structure of lithospheric mantle of the Black Sea (down to
the depth of 85 km) was studied by local seismic tomography which used travel times of P-waves
from the earthquakes occurred inside the region and recorded by a net of seismic stations around the
Black Sea. Results of seismic tomography study indicate heterogeneous structure of the upper
mantle of the Black Sea with dominant areas of increased velocities in the western and eastern parts
of the sea. Joining of two methods — gravity analysis and seismic tomography has been carried out
by calculation of gravity effect of the upper mantle heterogeneities obtained by seismic tomography.
Correspondence of the sign and order of magnitude of anomalous mantle gravity field obtained by
two mentioned independent methods gives us an opportunity to conclude on the presence of
sufficiently rigid continental lithosphere under the Black Sea.
2
Synergic tectonics. Physical nature of global cyclicities
 I. V. Karpenko, 2012
The main principles of synergic (self-organized) tectonics have been presented. Evolutionary
development of the Earth rotating around its own axis is considered as development of unbalanced
system terminating periodically by catastrophic process of orthogonal change of rotation axis. The
change of rotation axis occurs in the process of attaining but not violation of gravity-inertial
equilibrium that is a principal point because we do not need any additional energy impacts on the
system. Periodicity of geological processes (Wilson, Shtille cycles et al.) are related to
synchronizing effect of universal gravity-wave field, which nature is not force one, that is not
strength is in action but the changes of external conditions of terrestrial processes behavior. It has
been shown that in terms of the Universe structure, the basic periods of tectonic genesis of gravitywave nature are the Wilson period more than 400 million years long, the Shtille period in average
15 million years long, the Galaxy period with average duration 1,24 million years and the Stellar
period with a value of 11 years. They determine both tectonic and partly climatic history of the
Earth.
Paleostructure of the northwestern end of Antarctica and the Bransfield strait evolution
 Yu. V. Kozlenko, M. V. Kozlenko, 2012
In order to study evolution of the Bransfield Straight, reconstruction of paleostructure of
northwestern extremity of Antarctica has been conducted on the base of analysis of batimetric and
seismologic data as well as results of mapping of DSS and GPS observations. As a result of
conducted studies the limits of the Earth’s crust blocks of the northern extremity of the Antarctic
Peninsula, the North Shetland Islands and adjacent water area, which are different by their
characteristics and history of development have been found. A scheme has been proposed for the
mechanism of formation of up to-date structure of the region. It has been shown that earlier in this
region a single geomorphologic mega-structure existed. Expansion of the Earth’s crust in the central
part of the rift resulted in creation of the passive rift in the western sub-depression. The results
obtained testify to the fact that the leading role in formation of the North-Shetland trough was
played by the thrust of the South-Shetland block to the Phenix Plate as a result of spreading in the
Bransfield Straight. In such a way the concept of arising of this structure as a result of subduction of
the Plate Phenix under the Antarctic Peninsula is denied.
3
A model of seismic hazard of the northwestern part of the Black Sea
 B. G. Pustovitenko, V. E. Kulchitsky, A. A. Pustovitenko, 2012
Characteristics of seismic hazard assessment of marine areas have been considered. Modeling of
seismic hazard of northwestern part of the Black Sea shelf is made on the basis of the developed
models of seismicity, seismic sources, attenuation of the intensity and zones of earthquakes
occurrence. Maps of general seismic zoning of the shelf are presented for return periods of seismic
effects once in each 500 and 1000 years. According to these maps the entire territory of the shelf
refers to the seismically dangerous zone with estimated intensities of 6 and 7 points.
The nature and prediction of dynamic phenomena regional zoning in the mines of Donbass
 A. V. Antsiferov, M. M. Dovbnich, V. A. Kanin, I. A. Viktosenko, 2012
Principal propositions of the method and results of prediction of regional zones development of
dynamic phenomena in the mines of Donets Basin are considered on the basis of geo-logical
environment mechanical stresses estimation caused by disturbance of the equilibrium state
according to gravimetric data.
Earthquake effects in the behavior of ULF electromagnetic emissions
 B. V. Dovbnya, A. S. Potapov, R. A. Rakhmatulin, 2012
Anomalous changes in the behavior of Pc1 geomagnetic pulsations and oscillations with the
spectrum resonance structure (SRS) occurred a few minutes before or after an earthquake have been
found. In all cases the changes happened following the ULF electromagnetic pulse and were
observed either as a sudden stop of oscillations, or as their sharp intensification. SRS reflects the
ionosphere resonance properties that can be sharply modified due to impact of an earthquake on the
ionosphere layers. Changes in the resonance properties can be a reason of the effects in Pc1 s as
well. It is supposed that the effects in two types of emissions (Pc1 and SRS oscillations) are the
4
consequence of the complex processes in the upper atmosphere, including precipitation of the
charged particles into the ionosphere caused by interaction of ULF electromagnetic pulse of
lithosphere origin with radiation belt.
Description of conditions of melts and solutions differentiation in the mantle and crust
 O. V. Usenko, 2012
Melt is a solution of electrolyte and its structure under PT-conditions of the mantle is similar to the
structure of water solution. As independent parameters describing its behavior under constant
pressure and temperature we propose to use characteristics Еh and рН. Detailed reconstruction of
physical-chemical interactions taking place in the mantle and crust permits to solve not only
theoretical problems but also essentially localize the sites of search of mineral deposits related to
magmatic melts and hydrothermal solutions.
Up to date estimation of prospects of oil and gas presence and priority derections of the search
of new hydrocarbons deposits within the Kerch shelf of the Black Sea
 B. M. Polukhtovich, V. V. Gladun, T. Ye. Dovzhok, P. Ya. Maksimchuk, S. M. Zakharchuk,
P. M. Melnichuk, T. M. Galko, O. V. Volkova, V. P. Klochko, 2012
Drilling of parametric Subbotina-403 well in the Ukrainian sector of Kerch shelf of the Black Sea
conducted in 2004-2006 was marked by the first oil gusher within water areas of Ukraine. KerchTaman (Pivdennokerchenskyy) flexure with zones of anticline folds of northeast strike after
preliminary assessment of resources in 2004 was enriched with a new oil field Subbotina and
deserves a modern assessment of the prospects of oil and gas. On this basis reasonable priorities of
geological and geophysical exploration are substantiated.
Mathematical modeling of seismogravitational effect of oil and gas reservoir in crystalline
basement
 S A. Vyzhva, G. T. Prodayvoda, P. M. Kuzmenko, O. O. Kozionova, 2012
5
A new seismic and gravitational method for the decompacted zones detection in crystalline
basement, based on a multi-crack-cavernous pore (gas or oil saturated) model of crystalline
reservoir is proposed. To estimate the capabilities of the proposed method mathematical modeling
of effective elastic and acoustic properties of granite reservoir rocks with different pore space
structure is realized. The algorithm and software for solving the problem of joint inversion of
seismic and gravimetric data based on Born’s approximation for the space-time Green’s function
with root mean square background velocity for the horizontally-layered medium has been developed
and tested. It has been determined that the most reliable estimation of density and seismic velocity
can be obtained by joint inversion. Convincingly is illustrated on an example of the Prykerch shelf
model that the presence of decompacted oil or gas saturated zone in granite basement can be
confidently identified based on results of seismic and precise gravity observations.
Imaging of complex details of refraction boundary composition
 A. O. Verpakhovskaya, 2012
Migration transformations of the field of refracted waves make possible imaging of structural
features of irregularly shaped refraction boundary in deep dynamic section. First arrivals of refracted
waves are persistently traced on the wave field along considerable distances from the source of
wave excitation that is a guarantee of a high definition of recreation of structural details of the
studied boundary while processing the data of regional seismic exploration. Special features of
accomplishment of finite-difference migration of the refracted wave field under conditions of
refracting boundary structure complicated by faults have been considered as well as methodic
problems, related to valuation of the wave field interval where refracted waves are registered
depending on the velocity model of the medium. The results of the studies are demonstrated on the
model and practical materials.
Seismotomography of the mantle under the East European platform: mantle velocity borders
 T. A. Tsvetkova, I. V. Bugayenko, 2012
Mantle velocity boundaries of EEP have been specified. For the upper mantle and its transition zone
dynamics of propagation of mantle velocity limits with depth has been presented. Mantle border
area of EEP has been separated and corresponding high velocity inclined layers.
6