四川盆地上震旦统灯影组微生物碳酸盐岩储层特征与主控因素

doi:10.11743/ogg20170411

Abstract

Abstract: Microbial carbonates dominate the 2^nd and 4^th members of the Dengying Formation in the Upper Sinian,Sichuan Basin.The 2nd member contains mainly thrombolites and grapestones with botryoidalis pores,microbe visceral pores,microbe framework pores,inter-clot dissolved pores as reservoir space.Vertically,there are three reservoir intervals with bi-tumen concentrated 117 m below the unconformity of the first stage of the Tongwan movement.The 4th member contains largely laminites and stromatolites,with fenestral pores and karst pores as the main reservoir spaces and inter-clot dissolved pores and microbe visceral pores as the minor reservoir spaces.Three reservoir intervals occur in the member with bitumen concentrated 134.2 m below the unconformity of the second stage of the Tongwan movement.The development and distribution of microbial carbonate reservoirs in the members are suggested to be controlled mainly by shallow water tidal microbial mat,microbial structures,dolomitization and Mianyang-Changning intracratonic sag. The widespread mat might be the foundation of high-quality reservoirs,the microbial structures be the cause of the original reservoir diffe-rences,the dolomitization be the key to the formation of the reservoirs,and the weathering karst and burial dissolution controlled by the Mianyang-Changning intracratonic sag be the determinative factor for the modification and distribution of the reservoirs.And it is predicted that high-quality reservoirs in the Formation be along both sides of the margin area of Mianyang-Changning intracratonic sag.

Key words: stromatolite, thrombolite, intracratonic sag, microbial mat, microbialite, Dengying Formation, Upper Sinian, Sichuan Basin

CLC Number:

TE122.2

Song Jinmin, Liu Shugen, Li Zhiwu, Luo Ping, Yang Di, Sun Wei, Peng Hanlin, Yu Yongqiang. Characteristics and controlling factors of microbial carbonate reservoirs in the Upper Sinian Dengying Formation in the Sichuan Basin,China[J]. Oil & Gas Geology, 2017, 38(4): 741-752.

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Characteristics and controlling factors of microbial carbonate reservoirs in the Upper Sinian Dengying Formation in the Sichuan Basin,China

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