Logging response and parameters reconstruction of coal reservoir fractures in the southern Qinshui Basin

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  • 1.Geophysical Exploration Research Institute,Huabei Oilfield Company,PetroChina,Renqiu 062552,China;
    2.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China

Online published: 2019-09-09

Abstract

Effect of coalbed methane development is obviously influenced by the fracture characteristics in coal reservoir,and it is true for southern Qinshui Basin.According to the data on investigation in field with similar outcrops,core description,Formation Microscanner Image analysis and conventional logging,researches about fractures in coal reservoir formation were carried out on its development characteristics and response characteristics on conventional logging,based on which we get the method of identifying fractures in coal reservoir and analyse the application effect of this method.Fractures in research area are mainly tectonic shear fractures in NE,NW,near EW and near NS directions,and most of them are valid with high angle or some dip,small scale and great changeable density.The response characteristics of fractures in conventional reservoir are mainly represent as low resistivity,positive amplitude difference in laterolog resistivity of shallow and deep formation,some,but not obvious,deflection to larger porosity in three porosity log,high gamma value,obvious diameter extension,certain fluctuations in logging curve.On this base,anomaly index were reconstructed,fracture predictive index were composed by weighting processed logging curve to predict the fractures features in coal bed.The predictive result agrees well with core and FMI,which show that this method can provide certain reference function in identifying fractures in coal reservoir.

Cite this article

Wang Jian, Cui Yong-qian, Shi Jin-xiong, Liu Guo-ping, Xiao Yang, Zeng Lian-bo . Logging response and parameters reconstruction of coal reservoir fractures in the southern Qinshui Basin[J]. Natural Gas Geoscience, 2016 , 27(11) : 2086 -2092 . DOI: 10.11764/j.issn.1672-1926.2016.11.2086

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