Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 102-110.doi: 10.12108/yxyqc.20200111

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Organic facies and well logging evaluation of source rocks in centeral-south sag of Miaoxi Depression and its surrounding areas,Bohai Sea

SUN Zhe, PENG Jingsong, JIANG Shangkun, YE Tao, GUO Ying   

  1. Research Institute of Bohai Petroleum, Tianjin Branch of CNOOC Limited, Tianjin 300459, China
  • Received:2019-06-11 Revised:2019-08-16 Online:2020-01-21 Published:2019-11-22

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Abstract: Aiming at the problems of low exploration degree and strong heterogeneity of source rocks in the centeral-south sag of Miaoxi Depression and its surrounding area,Bohai Sea,based on the division of organic facies and the improved logging evaluation method of source rocks,combined with 3-D seismic data and the characteristics of sedimentary system in the study area,the organic facies types and the development characteristics of high-quality source rocks of the Es3 and Es4 were described. The results show that the source rocks of Es3 in the study area are mainly C and D/E facies, and the quality of the source rocks is good as a whole, but there is a certain degree of heterogeneity. The C-facies source rocks are mainly distributed in the south subsag of centeral-south sag of Miaoxi Depression and the junction of eastern subsag of Huanghekou sag and centeral-south sag of Miaoxi depression,while the distribution in the north subsag is relatively limited. The organic facies of the source rocks of the Es4 is mainly F facies,and the development of high-quality source rocks is limited. The C facies source rocks are mainly distributed in the south subsag of centeral-south sag of Miaoxi Depression. The south subsag is a superimposed development area of high-quality source rocks of Es3 and Es4,and it is a favorable zone for further exploration.

Key words: marginal depression, source rock evaluation, organic facies, centeral-south sag of Miaoxi Depression, Bohai Sea

CLC Number: 

  • TE122
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