Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 58-66.doi: 10.12108/yxyqc.20180207

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Types and controlling factors of shelf margin delta of Middle Miocene in Pearl River Mouth Basin

LI Wenjing1, WANG Yingmin1,3, HE Min2, CHEN Weitao2, XU Shaohua3,4, ZHUO Haiteng1,5   

  1. 1. Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China;
    2. CNOOC Limited-Shenzhen Branch, Shenzhen 518000, China;
    3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    4. State Key Laboratory of Exploration of Complex Gas and Oil Field in Chongqing Province, Chongqing University of Science and Technology, Chongqing 401331, China;
    5. Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences, South China Sea Institute of Oceanology, Guangzhou 510301, China
  • Received:2017-11-27 Revised:2018-02-01 Online:2018-03-21 Published:2018-03-21

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Abstract: The research of shelf margin delta has important significant for the analysis of hydrodynamic conditions and exploration of deep water hydrocarbon. The high-quality 2D and 3D seismic data and well logs were used to divide the internal sequence in seismic profile, and analyze the plane attribute distribution and well logging interpretation. Three types of shelf margin delta were identified in Middle Miocene in Zhu 2 Depression of Pearl River Mouth Basin, including fluvial-dominated, wave-dominated and mutual-influenced shelf margin delta. The fluvial-dominated shelf margin delta developed in lowstand system tract in Kaiping Sag, the wave-dominated type developed in falling-stage system in Baiyun Sag. The mutual types developed in falling-stage system in Kaiping Sag. The sequence and types of shelf margin deltas are influenced by the change of sea level and hydrodynamic conditions. While the developed location close to channel position in earlier high stand tract and further extended to the shelf margin delta. What more, the main body of shelf margin delta transfers from Baiyun Sag to Kaiping sag gradually, which was affected by the local change of source supply caused by neotectonic movement, including the activities of Dongsha uplift and Yunkai uplift. Finally, the shelf margin deltas show favorable reservoir quality, which can be good oil-gas exploration targets.

Key words: tight sandstone, mercury intrusion capillary pressure, pore classification, fractal dimension, reservoir evaluation, Jizhong Depression

CLC Number: 

  • P618.13
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