高阶煤层气储层非均质性及其定量评价——以沁水盆地南部郑庄区块为例

doi:10.11743/ogg20160110

Abstract

Abstract: Coal reservoir heterogeneity affects the exploitation of coalbed methane (CBM).The No.3 coal reservoir in the Zhengzhuang block in southern Qinshui Basin was taken as an example for intra-stratal heterogeneity study of high rank CBM,and vertical heterogeneity characteristics was quantitatively evaluated on physical properties (gas content,adsorption time,densities of macro-micro fracture) and coal petrology (macerals and maximum vitrinite reflectance) by using a variation coefficient.The following results were obtained.The ranking of intra-stratal heterogeneity of coal reservoir parameters from strong to weak is adsorption time (average variation coefficient is 0.5246),mineral content (0.4665),total density of micro-fracture (0.4381), total density of macro-fracture (0.3143), inertinite content (0.2473),vitrinite content (0.1125),gas content (0.0877) and maximum vitrinite reflectance (0.0135),among which adsorption time,mineral matter content and fracture densities have stronger intra-stratal heterogeneity and need to be evaluated as key parameters.This study proposed a new method for the description and quantitative evaluation of intra-stratal heterogeneity of coal reservoir.

Key words: variation coefficient, intra-stratal heterogeneity, high rank coal reservoir, Zhengzhuang block, Qinshui Basin

CLC Number:

TE122.2

Li Junqian, Lu Shuangfang, Xue Haitao, Wang Weiming, Zhang Ping. Intra-stratal heterogeneity of high rank coalbed methane reservoirs and their quantitative evaluation: A case study from Zhengzhuang block in the southern Qinshui Basin[J]. Oil & Gas Geology, 2016, 37(1): 72-79.

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Intra-stratal heterogeneity of high rank coalbed methane reservoirs and their quantitative evaluation: A case study from Zhengzhuang block in the southern Qinshui Basin

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