Oil & Gas Geology ›› 2004, Vol. 25 ›› Issue (2): 139-143.doi: 10.11743/ogg20040204

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Discovery of paleo-oil-reservoir in Qiangtang basin in Tibet and its geological significance

Wang Chengshan1, Yi Haisheng1,2, Liu Chiyang3, Li Yalin2, Zou Yanrong4, Wu Xinhe2, Deng Bin2, Yang Xingke3   

  1. 1. Key Laboratory of Reservoir Geology & Development Engineering, Chengdu University of Technology, Chengdu, Sichuan;
    2. Research Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan;
    3. Geology Department of Northwest University, Xi'an, Shaanxi;
    4. Guangzhou Geochemistry Research Institute of China Academy of Sciences, Guangzhou, Guangdong
  • Received:2004-04-07 Online:2004-04-25 Published:2012-01-16

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Abstract:

Palaeo oil reservoirs are distributed in a narrow belt, 100 km long in E W direction and 20 km wide in S N direction, in Bilongco Angdarco area of Qiangnan depression in the southern part of the central uplift zone of Qiangtang basin.They are exactly a group of oil seepages.The outcropped rocks are the Middle Jurassic Buqu Fm.,dark brown and brownish gray dolomite.They are deposited mainly as biohermal complex.Correlation shows that hydrocarbons in the palaeo oil reservoirs have been sourced mainly from Lower Jurassic.Modelling of hydrocarbon generation process indicates that there have been two hydrocarbon generation and expulsion processes,one in 140-150 Ma and another since 20 Ma. The discovery of the palaeo oil reservoir belt further verifies that Qiangtang basin has good petroleum prospect.

Key words: Tibet, Qiangtang basin, palaeo oil reservoir, petroleum prospects, organic geochemistry

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