STRIKE SLIP FAULT SYSTEMS AND ASSOCIATED SEDIMENTARY BASINS IN CHINA

Jin, Zhijun (Basin & Reservoir Research Center, University of Petroleum, Changping, Beijing, China 102249) | Bai, Guoping (Basin & Reservoir Research Center, University of Petroleum, Changping, Beijing, China 102249) | Ding, Wenlong (Qinghuangdao Campus, Daqing Petroleum Institute, Qinghuangdao, Hebei, China 066000)

OnePetro 

STRIKE SLIP FAULT SYSTEMS AND ASSOCIATED SEDIMENTARY BASINS IN CHINA Zhijun Jin, Basin & Reservoir Research Center, University of Petroleum, Changping, Beijing, China 102249 Guoping Bai Wenlong Ding Qinghuangdao Campus, Daqing Petroleum Institute, Qinghuangdao, Hebei, China 066000 Introduction The China Plate was affected by the NW-NWW subduction of the Pacific Plate since Mesozoic time and then influenced by the collision of the Indian Plate with the Euroasian Plate, which initiated from Eocene time. The interactions of the three plates led to the formation and development of three main strike slip fault systems in China: the Tanlu in the east, Aerjin in the northwest and Sanjiang in the southwest. This study will discuss the salient features of the three strike slip fault systems and the associated sedimentary basins and will also recommend exploration strategies for basins with different degrees of exploration maturity. Aerjin Strike Slip This system constitutes the northwestern boundary of the Qinghai-Tibet plateau. It separates the Fault System Tarim Basin from the Chaidam Basin. With a length of up to 3500 km, it affected an area of about 500,000 km2 and controlled the formation and development of 11 basins. The major strike slip movement of the fault system occurred during Tertiary time. As a result, basins associated with it include both Tertiary strike slip fault basins and deformed Mesozoic strike slip fault basins. The 11 basins associated vary greatly in terms of petroleum endowment. The difference is attributed to the varying factors of petroleum charge, trap and timing in these basins. The key exploration breakthroughs in these basins lie with better understanding of the regional tectonics and depositional history. Tanlu Strike-Slip This system affected the evolution and hydrocarbon generation, migration and accumulation of the Fault System important petroliferous Meso-Cenozoic basins in east China, which include the Songliao, Bohai Bay, and Subei-South Yellow Sea Basins. These basins lie adjacent to the fault system. Within the Tanlu fault zone, a series of grabens such as Yishu and Yilan-Yitong have also developed. The controls of the fault system on the basin development varied with time. It had little impact on the development of Early-Middle Jurassic basins in east China. These basins generally trend E-W and then SW-NE or NNE-SSW closer to the fault system. Their development was largely controlled by the E-W trending paleo-tectonic structures resulting from Indocynian orogeny during a slightly extensional stress environment. The Early-Middle Jurassic faulted basins tend to be small in scale and are highly separated from one another. There is little exploration in these basins. However, dark mudstones of deep lake origin have been proven to be well developed in some of these basins. Available geochemical data indicate that they are moderate to good, mature to high mature oil source rocks. Their source rock potential is further