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

Li Junqian; Lu Shuangfang; Xue Haitao; Wang Weiming; Zhang Ping

doi:10.11743/ogg20160110

Views : 0 下载量: 628 CSCD: 0

PDF
Export
Share
Collection
Album

Intra-stratal heterogeneity of high rank coalbed methane reservoirs and their quantitative evaluation: A case study from Zhengzhuang block in the southern Qinshui Basin
Vol. 37, Issue 1, Pages: 72-79(2016)
Online First：08 February 2016，

Published：2016
DOI： 10.11743/ogg20160110
稿件说明：

移动端阅览

DOI：

Li Junqian, Lu Shuangfang, Xue Haitao, et al. 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]. 2016, 37(1): 72-79. DOI： 10.11743/ogg20160110.

摘要

煤储层非均质性影响煤层气开采。以沁水盆地南部郑庄区块3#煤层为例，开展高阶煤层气储层非均质性研究。采用变异系数定量评价了煤储层物性参数（含气量、吸附时间、宏观和显微裂隙密度）和煤岩学参数（显微组分和最大镜质体反射率）在储层纵向上的非均质发育特征。结果表明：煤储层参数层内非均质程度由强至弱依次为吸附时间（平均变异系数0.5246）、矿物质含量（0.4665）、总显微裂隙密度（0.4381）、总宏观裂隙密度（0.3143）、惰质组含量（0.2473）、镜质组含量（0.1125）、含气量（0.0877）和最大镜质组反射率（0.0135）。其中，吸附时间、矿物质含量和裂隙密度层内非均质性较强，是需要重点评价的储层参数。研究成果为煤层气储层非均质性的精细刻画以及定量评价提供了新的思路。

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.