Mechanism of Reservoir Quality Difference of Lacustrine Carbonate in Lower Member 1 Shahejie Formation in Qikou Sag

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  • 1.Faculty of Geosciences,China University of Petroleum,Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
    3.Oil and Gas Survey,China Geological Survey,Beijing 100029,China

Received date: 2013-04-03

  Revised date: 2013-06-18

  Online published: 2014-02-10

Abstract

The lacustrine carbonate reservoirs with multi-type reservoir spaces are strongly nonhomogeneous in the Lower Member 1 of Shahejie Formation in Qikou Sag.It is difficult to understand the oil pool distribution and predict favorable reservoirs in the study area.In order to solve this problem,this paper comprehensively applied drilling data,logging data,core observation,thin section identification and analysis assay data to study characteristics and formation mechanism of lacustrine carbonate reservoirs.Primary pore,secondary dissolution pore and fracture are developed in the medium porosity and medium permeability carbonate reservoirs.The reservoir quality difference includes three aspects.Firstly,porosity and permeability are obviously different in the space.Secondly,the dominant reservoir space partition is evident.Thirdly,porosity and permeability are various in different lithologies.The particle limestone is of the highest porosity and permeability,micritic dolomite is the second,and micritic limestone is the lowest.Reservoir quality difference is evidently controlled by sedimentary facies,heterogeneous dissolution and tectonics.Organic bank and oolitic  bank are favorable sedimentary facies for high quality reservoirs in this area.Micritic dolomite near the faults is inclined to fracture.Heterogeneous dissolution caused by different components and the development degrees of primary pore and fracture is the basic factor that caused the reservoir quality difference.

Cite this article

LI Yan,JIN Zhen-kui,YANG You-xing,GUAN Quan-sheng,LI Peng . Mechanism of Reservoir Quality Difference of Lacustrine Carbonate in Lower Member 1 Shahejie Formation in Qikou Sag[J]. Natural Gas Geoscience, 2014 , 25(2) : 201 -211 . DOI: 10.11764/j.issn.1672-1926.2014.02.201

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