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PS Hydrocarbon Prospectivity of the Western Mediterranean Basin, The Provencal Basin* David Williams2, Stefania Guerzoni2, Mara Marian2, Enrica Battara2, and Angelo Ricciato1 Search and Discovery Article #10687 (2014)** Posted December 15, 2014 *Adapted from poster presentation given at AAPG International Conference & Exhibition, Istanbul, Turkey, September 14-17, 2014 **Datapages © 2014 Serial rights given by author. For all other rights contact author directly. 1 Geplan Consulting, Ferrara, Emilia Romagna, Italy ([email protected]) Geplan Consulting, Ferrara, Emilia Romagna, Italy 2 Abstract The Western part of the Mediterranean Region is one of the most attractive areas for hydrocarbon exploration in new frontiers of the entire basin. This sector is characterised by three main domains: the Valencia Trough, the Balearic Basin and the Provencal Basin. The Provencal Basin is the result of the European Rift System, together with the Valencia trough and the Balearic domain, showing several common characteristics with these productive provinces. The basin is placed in that portion of the Mediterranean Sea with water depth that exceed 2000m, between France, Italy, the Balearic Islands and the islands of Sardinia and Corsica. It encompasses nearly 300,000 square kilometres and includes the Rhone River submarine fan on the continental slope of southern France. The Provencal basin is an unexplored sedimentary basin (with no exploration drilled wells and limited seismic), but onshore analogues, along the adjacent sectors of France, Spain and Italy, indicate good potentials for hydrocarbon reserves that are expected to be recognised also in the basin. The analysis of this area suggests the presence of pre, syn and post rift complete HC systems, that have been already observed in the analogues of Sardinia and France and assessed as possible target for the HC exploration. Moreover, the presence of evaporites, which have been deposited during the Messinian Salinity Crisis (MSC), could guarantee a remarkable seal system. The main exploration targets could be the hydrocarbons contained in the pre rift Mesozoic tilted blocks formed during the extensional phases associated to the Miocene rift. Possible quantities of biogenic gas could be included also in the Plio-Quaternary proximal to distal sediments and in the turbidites deposits related to the syn-rift phase. The hydrocarbon potentials in the Provencal Basin have been topic of debate in the recent time, but also an interesting challenge for the oil industry, considering the undiscovered prospects for future exploration in this portion of the Mediterranean Sea. References Cited Bache, F., J.L. Oliveta, C. Gorinid, D. Aslaniana, F. Labails, and M. Rabineau, 2010, Evolution of rifted continental margins: The case of the Gulf of Lions (Western Mediterranean Basin): Earth and Planetary Science Letters, v. 292/3-4, p. 345-356. Breman, E., 2006, Oil and gas plays in the East Mediterranean: 5th Petroleum Exploration Society of Great Britain/Houston Geological Society, African Conference, London, (Expanded Abstract). Carminati, E., M. Lustrino, and C. Doglioni, 2012, Geodynamic evolution of the central and western Mediterranean: Tectonics vs. igneous petrology constraints: Tectonophysics, v. 579, p. 173–192. doi:10.1016/j.tecto.2012.01.026 Caron, J.P., M. Dusand, and H. Hagon, 2011, Triassic of Southeast France (Provence: Var and Alpes – Maritimes: Pan-European Correlation of the Triassic, 8th International Field Workshop, p. 1-67. Gailler, A., F. Klingelhoefer, J.L. Olivet, and D. Aslanian, 2009, Crustal structure of a young margin pair: New results across the Liguro– Provencal Basin from wide-angle seismic tomography: Earth and Planetary Science Letters, v. 286, p. 333–345. Ianev, R.S., N.B. Floch, J.R. Underhill, and R.J.W. Bunt, 2007, The Role of Active Structural Growth in Controlling Deep-Water Reservoir Systems and Petroleum Prospectivity in the Confined Gulf of Lion Basin, Western Mediterranean: AAPG Search and Discovery Article #10124. http://www.searchanddiscovery.com/documents/2007/07024ianev/index.htm?q=%2BtextStrip%3A10124 Lofi, J., V. Gaullier, F. Sage, F. Chanier, J. Deverchere, C. Gorini, A. Maillard, V. Pascucci, N. Sellier, and I. Thinon, 2010, Messinian seismic Markers in the Western Tyrrhenian Sea: Preliminary results from the "METYSS" Cruise (June 2009): EGU General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria, p. 10022. Rabineau, M., D. Aslanian, C. Gorini, and K. Alain, 2010, Drilling below the salt in the Western Mediterranean Sea: The GOLD-1 (Gulf of Lion Drilling): EGU General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria, p. 12793 Roberts, G., and D. Peace, 2007, Hydrocarbon plays and prospectivity of the Levantine Basin, offshore Lebanon and Syria from modern seismic data: GeoArabia, v. 12/3, p. 99-124. Ronchi, A., E. Sarria, and J. Broutin, 2008, The “Autuniano Sardo”: Basic features for a correlation through the Western Mediterranean and Paleoeurope: Bollettino della Società Geologica Italiana, v. 127, p. 655–681. USGS, 2010, Assessment of Undiscovered Oil and Gas Resources of the Levant Basin Province, Eastern Mediterranean: Fact Sheet 2010– 3014, p. 1-4. HYDROCARBON PROSPECTIVITY OF THE WESTERN MEDITERRANEAN BASIN, THE PROVENCAL BASIN David Williams (*), Stefania Guerzoni (*), Mara Marian (*), Enrica Battara (*), Angelo Ricciato (*), (*) GEPlan Consulting, Italy Abstract The Western part of the Mediterranean Region is one of the most attractive areas for hydrocarbon exploration in new frontiers of the entire basin. This sector is characterised by three main domains: the Valencia Trough, the Balearic Basin and the Provencal Basin. GEPlan Consulting s.r.l. Petroleum GeoSciences GEOLOGICAL FRAMEWORK & TECTONIC EVOLUTION (from Carminati et al. 2012) The Provencal Basin is the result of the European Rift System, together with the Valencia trough and the Balearic domain, showing several common characteristics with these productive provinces. The basin is placed in that portion of the Mediterranean Sea with water depth that exceed 2000m, between France, Italy, the Balearic Islands and the islands of Sardinia and Corsica. It encompasses nearly 300,000 square kilometres and includes the Rhone River submarine fan on the continental slope of southern France. Carminati et al. 2012 The Provencal basin is an unexplored sedimentary basin (with no exploration drilled wells and limited seismic), but onshore analogues, along the adjacent sectors of France, Spain and Italy, indicate good potentials for hydrocarbon reserves that are expected to be recognised also in the basin. The analysis of this area suggests the presence of pre, syn and post rift complete HC systems, that have been already observed in the analogues of Sardinia and France and assessed as possible target for the HC exploration. Moreover, the presence of evaporites, which have been deposited during the Messinian Salinity Crisis (MSC), could guarantee a remarkable seal system. Late Eocene The main exploration targets could be the hydrocarbons contained in the pre rift Mesozoic tilted blocks formed during the extensional phases associated to the Miocene rift. Possible quantities of biogenic gas could be included also in the Plio-Quaternary proximal to distal sediments and in the turbidites deposits related to the syn-rift phase. The hydrocarbon potentials in the Provencal Basin have been topic of debate in the recent time, but also an interesting challenge for the oil industry. This report provides a detailed geological characterisation, stratigraphy and geochemistry analysis (integrating the published petroleum geology and available geophysics) of the whole area focusing on undiscovered prospects for future exploration in this portion of the Mediterranean Sea. STRATIGRAPHY Aquitanian Permian - Middle Triassic It is composed of grey to red sandstones and thin pelites deposited on an alluvial plain under warmer and humid conditions; its Permian, post-Asselian age cannot be better constrained because of the scarcity of fossil content. PROVENCE SOUTHERN FRANCE These two rst unitsare overlain by lithofacies C at an unseen boundary. This unit, consists of dark-red clay-siltstones to rarer medium-grained sandstonesand micronglomerates. Recently, isolated amphibian were also found in a more than 1 m thick freshwater limestone layer in the upper part of lithozone B. it is mainly made up of medium- to coarse-grained pyroclastic deposits (with silicied plant trunks) and rhyolitic lava ows which have been radiometrically dated (SHRIMP and leadzircon evaporation methods, 297±5 Ma, by COCHERIE in PITTAU et alii, 2002). It is composed of grey-black sandy shales, rich in plant remains and in sporomorphs, deposited in a uvial-lacustrine to palustrine environment. For such unit of the Guardia Pisano sequence, an early Asselian age is indicated by a rich sporomorph record (PITTAU et alii, 2002). The palynological associations reect assemblages of meso-xerophilous plants growing in dryer environments, belonging to tropical and subtropical phytogeographical biomas Present day Langhian Middle - Upper Triassic ANALOGUES (LEVANTINE BASIN) AVAILABLE SEISMIC & MAIN DOMAINS 44°0'0"N 2°0'0"E 4°0'0"E ® 6°0'0"E 8°0'0"E 10°0'0"E ® Italy France France Italy I II CIE-1 AGM-1 SI-1 MIS-1 AUT-2 AUT-1 RA-1 Geological Cross-section across the Levantine Basin (USGS ,2010) France III Spain TR-1 West GLP-2G IV III GLP-1 42°0'0"N I France Spain Domains Corsica _ ^ Italy II Zone I, continental crust Zone II, necking zone Zone III, transitional crust Zone IV, oceanic domain 0 50 100 Bache et al., (2010), Gailler et al. (2009) Kilometers Salt deposits 40°0'0"N Sardinia Balearic Islands Rollover anticlyne zone Italy 200 0 25 50 Kilometers 100 France Salt diapir zone ORISTANO 002 Salt pillow zone ORISTANO 001 Spain Ianev et al., 2007 ® CAMPIDANO 001 38°0'0"N MARCELLA 001 Gulf of Lion Tectonic elements in the East Mediterranean Basin (Breman, 2006). The main elements defining the Levantine Basin include the Nile Delta Cone, Eratosthenes Seamount, the Cyprus/Larnaca Thrust Zone and the coastal margin faults along the Eastern margin of the Basin. (Roberts and Peace, 2007) Pre-Stack Depth Migration (PSDM) showing numerous plays in offshore Lebanon (LEB-02 survey area). Section width approximately 40 km. Vertical scale in depth (km). (Roberts and Peace, 2007) Spain 0 50 100 POTENTIAL PLAYS 200 Kilometers France wells offshore Sardinia wells _ ^ GOLD project Seismic Lines MS SARD85 Sesame 2001 SA rm Marion MDT HR2 LRM96 SM ES OR onshore CA onshore Calamar ECORS MEDS MAP Sardinia MF92 GL81 GL80 HR1 Ligo Ligo80 RM84 Unknown CROP Italian Ministry SARDINIAN MARGIN GULF OF LION MARGINS SARDINIA Legend Cross-section showing Zones I-IV in the Liguro-Provencal Basin (Rabineau et al ,2010) Seismic line across the western margin of Sardinia Line SM12 (inside the Oristano Amphitheatre, out of the main canyon) Sage et al. In: Lofi et al., 2010 Ianev et al., 2007 GEPlan Consulting s.r.l. via L. Ariosto 58, Ferrara - ITALY www.geplan.it [email protected]