Characteristics and origin of microbial dolomite reservoirs in Upper Sinian Deingying Formation,eastern Gaoshiti area,Sichuan Basin,SW China

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  • Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China

Received date: 2016-06-12

  Revised date: 2016-09-06

  Online published: 2017-08-10

Abstract

Based on regional geology,core description and thin section observation,the petrology and reservoir properties of the microbial carbonates of Upper Sinian Dengying Formation (Z2dn) in eastern Gaoshiti area in the Sichuan Basin are investigated in detail.The origin of the microbial dolostone is analyzed briefly.Dolostones dominate in microbial carbonate rocks of Dengying Formation and the lithology include stromatolite,spherulite,thrombolite and spongy layered dolomite.Microbial dolostone reservoirs are mainly developed in both the upper & lower parts of Z2dn4,and in Z2dn2.The reservoir space is composed of fenestral pores,skeleton cavities,inter-particle dissolution pores,inter-crystal dissolution pores and moldic pores.The good reservoirs mostly have a porosity range of 1% to 6% and permeability of less than 1×10-3μm2.The formation and distribution of the microbial dolomite reservoirs are jointly controlled by the original rock type and digenesis.Different microbial textures in the originally deposited rocks determined the types of reservoir space and pore structure.Diagenesis is a key factor for development of microbial reservoirs.The constructive diagenesis for forming good reservoirs are early microbial dolomitization,karst,and burial dissolution;while the destructive diagenesis are over-dolomitization and intense silicification.

Cite this article

Zhai Xiu-fen,Wang Ze-cheng,Luo Ping,Wang Tong-shan,Shi Shu-yuan,Zhang Hong . Characteristics and origin of microbial dolomite reservoirs in Upper Sinian Deingying Formation,eastern Gaoshiti area,Sichuan Basin,SW China[J]. Natural Gas Geoscience, 2017 , 28(8) : 1199 -1210 . DOI: 10.11764/j.issn.1672-1926.2016.11.003

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