Author(s): SUN Wei, LI Zhi-wu, XIAO Qiu-gou, WANG Xing-jian, WANG Chen-xia, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Southern Oil and Gas Exploration Branch Company of SINOPEC
Pages: 419-426
Year: 2015 Issue:  4
Journal: Journal of Chengdu University of Technology
Keyword:  Tibetan Plateau; Lunpola Basin; Niubao Formation; oil and gas accumulation;
Abstract: This paper discusses the petroleum accumulation of Paleogene Niubao Formation in Lunpola Basin,Tibet, China. By analysing the petroleum geological conditions and comprehensively researching the petroleum system,this paper studies the accumulation process and mechanism in Lunpola Basin.The main hydrocarbon source of Niubao Formation in the middle-deep layer on the north margin of Lunpola Basin is Member 2of Niubao Formation.This is a self-generating and selfstoring reservoir.The source rocks began to generate hydrocarbon in the end of the third member of the Niubao Formation deposition and generated a large number of hydrocarbon in the period of the Dingqinghu Formation deposition.The accumulation process on the north margin of Lunpola Basin can be summarized into three stages:1the Oligocene epoch(34~23Ma B.P.),the formation of the ancient reservoir;2late Oligocene-middle and late Miocene(23~13 Ma B.P.),the adjustment of the ancient reservoir;3late Miocene(13Ma B.P.)to present,further adjustment and destruction of the ancient reservoir.The accumulation idea of this process can be also applied to the other similarPaleogene sedimentary basins of Qinghai-Tibet Plateau.