Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 95-104.doi: 10.12108/yxyqc.20220209

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Miocene river-wave dominated sedimentary system in south belt of Enping Sag and its significance

ZHANG Xiaozhao1, WU Jing1, PENG Guangrong1, XU Xinming1, ZHENG Xiaobo2   

  1. 1. Shenzhen Branch, CNOOC China Limited, Shenzhen 518054, Guangdong, China;
    2. Faculty of Resources, China University of Geosciences(Wuhan), Wuhan 430074, China
  • Received:2021-08-12 Revised:2021-12-22 Online:2022-03-01 Published:2022-03-14

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Abstract: The south belt of Enping Sag is a favorable oil and gas enrichment area with a sedimentary background of developing lithologic traps. However, the exploration of lithologic reservoirs in this area stared relatively late, the understanding of lithologic traps is not enough, which restricts the progress of lithologic trap exploration. In Sag, based on high-precision sequence framework and sedimentary filling sequence, the sedimentary characteristics, sedimentary facies distribution and evolution law of river-wave dominated system were analyzed by using logging, core and seismic data, and then the identification marks, distribution law and development characteristics of lithologic traps of sand bodies under river-wave dominated system were dissected. The results show that river-wave dominated delta sedimentary system is developed in the Miocene in the south belt of Enping Sag, EP1, EP2 and EP3 oil areas are favorable areas for lithologic trap development, the fifth and sixth members of Hanjiang Formation and the first member of Zhujang Formation are favorable zones for lithologic trap development, and wave-reformed sandstone is the main reservoir of lithologic traps. The research results play a guiding role in lithologic exploration in south belt of Enping Sag.

Key words: river-wave dominated system, high-precision sequence, lithologic trap, Hanjiang Formation, Zhujiang Formation, Miocene, Enping Sag

CLC Number: 

  • TE122
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