The North Sakhalin Neogene total petroleum system of eastern Russia

This report was prepared as part of the World Energy Project of the U.S. Geological Survey.For this project, the world was divided into eight regions and 937 geologic provinces, which were then ranked according to the discovered oil and gas volumes within each (Klett and others, 1997).Next, 76 "priority" provinces (exclusive of the U.S. and chosen for their high ranking) and numerous "boutique" provinces (exclusive of the U.S. and chosen for their anticipated petroleum richness or special regional economic importance) were selected for appraisal of oil and gas resources.The petroleum geology of these priority and boutique provinces is described in this series of reports.The North Sakalin Basin Province ranked 50th in the world, exclusive of the U.S.The purpose of the World Energy Project is to assess the quantities of oil, gas, and natural gas liquids that have the potential to be added to worldwide reserves within the next 30 years.These volumes either reside in undiscovered fields whose sizes exceed the stated minimum-field-size cutoff value for the AU (variable, but must be at least 1 million barrels of oil equivalent), or they occur as reserve growth of fields already discovered.Assessment results are documented separately from this report.The Total Petroleum System (TPS) constitutes the basic geologic unit of the oil and gas assessment.The TPS includes all genetically related petroleum that occurs in shows and accumulations (discovered and undiscovered) that (1) has been generated by a pod or by closely related pods of mature source rock and (2) exists within a limited mappable geologic space, along with the other essential mappable geologic elements (reservoir, seal, and overburden rocks) that control the fundamental processes of generation, expulsion, migration, entrapment, and preservation of petroleum.The minimum petroleum system is that part of a TPS encompassing discovered shows and accumulations, along with the geologic space in which the various essential elements have been proved by these discoveries.An. Assessment Unit (AU) is a mappable part of a TPS in which discovered and undiscovered fields constitute a single, relatively homogenous population such that the 2 North Sakhalin Neogene Total Petroleum System (#132201), North Sakhalin Island area of eastern Russia, North Sakhalin Basin Province (#1322), Former Soviet Union (Region 1) ABSTRACTThe North Sakhalin Basin Province of eastern Russia contains one Total Petroleum System (TPS) -North Sakhalin Neogene -with more than 6 BBOE known, ultimately recoverable petroleum (61% gas, 36% oil, 3% condensate).Tertiary rocks in the basin were deposited by the prograding paleo-Amur River system.Marine to continental, Middle to Upper Miocene shale to coaly shale source rocks charged marine to continental Middle Miocene to Pliocene sandstone reservoir rocks in Late Miocene to Pliocene time.Fractured, self-sourced, Upper Oligocene to Lower Miocene siliceous shales also produce hydrocarbons.Geologic history is that of a Mesozoic Asian passive continental margin that was transformed into an active accretionary Tertiary margin and Cenozoic fold belt by the collision of India with Eurasia and by the subduction of Pacific Ocean crustal plates under the Asian continent.The area is characterized by extensional, compressional and wrench structural features that comprise most known traps.