Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (4): 393-397.doi: 10.11743/ogg20090401

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High-quality source rocks and their distribution prediction in the Bohai Sea waters

Pang Xiongqi1,2, Guo Yonghua3, Jiang Fujie1,2,4, Yin Xiangdong1,2, Ma XingZhi1,2, Guo Enzhen1,2   

  1. 1. Research Center for Basin and Reservoir, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    3. Exploration and Development Research Institute, CNOOC Tianjin Company, Tianjin 300452, China;
    4. Faculty of Geology and Exploration Engineering, Xinjiang University, Urumqi, Xinjiang 830046, China
  • Received:2009-06-03 Online:2009-08-25 Published:2012-01-16

Abstract:

Although dark mudstones are well developed in the Paleogene of the Bohai Sea waters,the major source rocks are still poorly understood,constraining the planning of exploration strategy.To tackle the problem,researchers redefined the high-quality source rocks and preliminarily developed a systemic method for its evaluation and prediction.The method was applied to the prediction of source rocks in the Paleogene in the Bohai Sea waters.The following understandings were obtained.Vertically,the source rocks in the Shahejie Formation are large in thickness,high in quality and relatively large in proportion to the dark mudstones.In contrast,although the dark mudstones in the Dongying Formation are large in thickness,high-quality source rocks are rare.Laterally,source rocks in the Bozhong depression are the largest in both thickness and distribution,followed by Liao-dong Bay,Qikou and Huanghekou depressions.Source rocks of Es4-Ek are mainly developed in Liaodong Bay area,Laizhou Bay and Qikou depressions.In general,the major source rocks in the study area are considered to come from the Shahejie Formation,of which the Es3 is the most important.

Key words: high-quality source rock, expulsion threshold, Paleogene, Bohai Sea waters

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