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Cap rock effectiveness evaluation and application of marine mudstonein Enping Sag of Pearl River Mouth Basin

Liu Pei,Yu Shui-ming,Wang Fu-guo,Tao Wen-fang,Zhang Qing,Xu Xin-ming,Hu Kun   

  1. Research Institute of CNOOC Shenzhen Branch,Shenzhen 518054,China
  • Received:2016-10-28 Revised:2017-02-08 Online:2017-03-10 Published:2017-03-10

Abstract:

Middle-shallow marine facies mudstone are widely distributed in Enping Sag of Pearl River Mouth Basin.It is of great significance for oil and gas block preservation.According to the analysis of macro sedimentary background in the study area,cap rock effectiveness is embodied in plane continuity and vertical sealing ability,which is controlled by thickness of mudstone and breakthrough pressure,and affects the scale of oil and gas accumulation.Based on the relationship between known oil and cap rock quality,the lower limit of cap rock is determined.Cap rock can be divided into three categories by the lower limit,i.e.,generally cap rock,effective cap rock and high effective cap rock,and the evaluation model is established.Evaluation model used in the northern palaeouplift shows that the cap rock quality in lower Zhujiang Formation is basically the same as that in the Zhuhai Formation with similar number of efficient cap rock.There are large differences about cap rock in lower Hanjiang Formation and upper Zhujiang Formation.The eastern efficient mudstone cap rock is clearly more than the western,and similar to south belt oilfield group.Its cap rock condition is superior.From the point of view of oil and gas preservation,various types of targets have certain exploration potential in eastern belt.

Key words: Pearl River Mouth Basin, Enping Sag, Cap rock condition, Marine mudstone, Breakthrough pressure, Thickness of mudstone

CLC Number: 

  • TE122.2+21

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