Geodynamics and Oil Content of Horizontal Strike-Slip Fault Structures in Western Siberia

Impact of the Regional Pai-Khoi-Altai Strike-Slip Zone on the Localization of Hydrocarbon Fields in Pre-Jurassic Units of West Siberia

“…According to various authors, deep-seated tectonic processes led to leaching of feldspar from acidic rocks, karst formation in carbonate rocks, the development of caverns and fractures, and the leaching of minerals from basic lavas (basalts), resulting in the formation of porous and fractured reservoirs [21,34,35]. Traps in such rocks are typically located in structural highs of the basement (with more developed weathering crust), in areas of Triassic rock exposure on basement uplifts [7], and near fault disruptions that create collectors and tectonic-screened traps [36].…”

“…According to various estimates, 3 to 15% of the world's proven oil reserves are localized in the basement rocks. However, the volume of exploratory drilling to reach this level is an order of magnitude less than in the sedimentary cover, and the discovery of deposits of this type often happens by chance [4].…”

“…In the pre-Jurassic complex of Western Siberia, deposits have been identified at dozens of fields with oil reserves of about 0.2 billion tons (for comparison, current recoverable reserves from all horizons of Western Siberia are nearly 18 billion tons) [5,6]. The prospects for new discoveries in such deposits are significant, and the pre-Jurassic complex deposits are considered to be the principal source for locating large reserves in the Western Siberia region [7].…”

“…Lobova [10] wondered about the oil and gas content of the pre-Jurassic rock, A.I. Timurziev [4,11] •…”