渤南洼陷北部陡坡带沙河街组砂砾岩有效储层物性下限及其主控因素

doi:10.11743/ogg20120514

Abstract

Abstract:

This paper determined the lower limits of physical properties for the effective coarse-grained clastic reservoir rocks in different intervals of the Shahejie Formation on northern steep slope of Bonan subsag,the Bohai Bay Basin by integrating the distribution function curve and production test methods combined with logging and production testing data.The relational expressions between the lower limits of physical properties and depths were also defined through matching.On this basis,this paper analyzed the effects of lithology,sedimentary facies,diagenetic stage and formation pressure on the formation of effective reservoir rocks.The lower limits of physical properties of effective reservoirs decrease with the increasing depth.Favorable sedimentary facies is the key factor controlling the development of effective coarse-grained clastic reservoirs,and determine reservoir quality.The effective reservoirs area are mainly distributed in the western slump turbidite fans and the midfan of the central and eastern nearshore subaqueous fans in the study,the latter is better.Diagenesis also affect reservoir quality to a certain extent.The coarse-grained clastic reservoirs developed mostly at A₁ and A₂ substage of middle diagenetic stage,which correspond to the major hydrocarbon generation stage during organic thermal evolution,which is favorable for the formation of secondary porosity,with dissolution improving the quality of deep reservoir rocks.,Formation pressure has little effect on effective reservoir rocks.

Key words: effective reservoir, physical property, coarse-grained clastic reservoir, northern steep slope, Bonan subsag, Bohai Bay Basin

CLC Number:

TE112.3

Li Wenhao, Zhang Zhihuan, Zan Ling, Zhang Lisheng. Lower limits of physical properties and their controlling factors of effective coarse-grained clastic reservoirs in the Shahejie Formation on northern steep slope of Bonan subsag,the Bohai Bay Basin[J]. Oil & Gas Geology, 2012, 33(5): 766-777.

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Lower limits of physical properties and their controlling factors of effective coarse-grained clastic reservoirs in the Shahejie Formation on northern steep slope of Bonan subsag,the Bohai Bay Basin

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