Oil & Gas Geology ›› 2015, Vol. 36 ›› Issue (1): 23-34.doi: 10.11743/ogg20150104

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Accumulation conditions of tight sand gas in the 3rd member of the Shahejie Formation in Nanpu Sag, Bohai Bay Basin

Guo Jigang1,2, Dong Yuexia3, Pang Xiongqi1,4, Huang Hongxiang3, Jiang Fujie1,4, Xu Jing1, Wang Pengwei1, Peng Weilong1   

  1. 1. Research Center of Basin and Reservoir, China University of Petroleum, Beijing 102249, China;
    2. Strategic Research Center of Oil and Gas Resources, Ministry of Land and Resources, Beijing 100034, China;
    3. Jidong Oil Company, PetroChina, Tangshan, Heibei 063004, China;
    4. Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
  • Received:2014-08-15 Revised:2014-11-12 Online:2015-02-08 Published:2015-02-11

Abstract:

Based on analyses of the source rocks and reservoirs in the Es3 (the 3rd member of Shahejie Fm), the hydrocarbon expulsion history was restored with the hydrocarbon generation potential method, and evolution history of reservoir porosity was established through numerical modeling.The results show that accumulation conditions of tight sand gas in the Es3 in the Nanpu Sag of the Bohai Bay Basin are pretty good: fair-good source rocks and widespread reservoirs were closely connected with each other, and the timing of gas accumulation and reservoir tightening was favorable.The peak gas expulsion occurred from the Guantao to early Minghuazhen, while the reservoir tightening was from the late Guantao to early Minghuazhen.These gases might accumulate in the lenticular sand body near the source rocks under the force of gas expansion, forming continuous tight sand gas reservoirs.

Key words: accumulation condition, source rock, tight sand gas, the 3rd member of Shahejie Formation, Nanpu Sag

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