基于变孔隙压缩系数的深部低阶煤层渗透率实验

doi:10.7623/syxb201403007

石油学报 ›› 2014, Vol. 35 ›› Issue (3): 462-468.DOI: 10.7623/syxb201403007

基于变孔隙压缩系数的深部低阶煤层渗透率实验

汪岗, 秦勇, 申建, 赵丽娟, 赵锦程, 李叶朋

中国矿业大学资源与地球科学学院煤层气资源与成藏过程教育部重点实验室江苏徐州 221008

收稿日期:2013-12-25 修回日期:2014-03-13 出版日期:2014-05-25 发布日期:2014-04-11
通讯作者: 汪岗，男，Email：wgkdwb@163.com
作者简介:汪岗，男，1991年10月生，2012年获中国矿业大学地质工程学士学位，现为中国矿业大学资源与地球科学学院博士研究生，主要从事煤层气地质研究。Email：wgkdwb@163.com
基金资助:
国家重大科技专项（2011ZX05033-003-02）、国家自然科学基金青年科学基金项目（No.41302131）和大学生实践创新训练计划项目（X1029012100，X1029012102）资助。

Experimental studies of deep low-rank coal reservoirs’ permeability based on variable pore compressibility

Wang Gang, Qin Yong, Shen Jian, Zhao Lijuan, Zhao Jincheng, Li Yepeng

School of Resources and Geosciences, China University of Mining and Technology; Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, Xuzhou 221008, China

Received:2013-12-25 Revised:2014-03-13 Online:2014-05-25 Published:2014-04-11

摘要/Abstract

摘要：

深部低煤阶煤渗透率研究可为深部煤层气评价选区提供关键依据。基于应力-孔隙压缩系数-渗透率三者关系理论分析，利用高温覆压孔渗透实验数据，构建了变孔隙压缩系数下深部煤层渗透率预测模型。实验结果显示，变孔隙压缩系数下渗透率的预测模型较定孔隙压缩系数下渗透率预测模型能更为准确描述深部煤层渗透率，老君庙矿区的初始孔隙压缩系数为0.09 MPa^-1，孔隙压力随有效应力变化的衰减系数为0.07 MPa^-1，且初始渗透率随着温度升高而降低。根据孔隙压缩系数的定义，计算得到孔隙压缩系数。计算结果显示：实测孔隙压缩系数与拟合孔隙压缩系数之间的相关性较强；随着埋深增加，定孔隙压缩系数较变孔隙压缩系数模型下预测的渗透率偏低，揭示了该地区深部煤层渗透率并非如前所预期之悲观，仍存在一定可采潜力。

关键词: 准噶尔盆地, 深部煤层气, 渗透率, 孔隙压缩系数, 预测模型

Abstract:

Studies on the deep low-rank coal reservoirs' permeability can provide a key basis for evaluation and regional selection of deep coalbed methane (CBM). Through theoretical analyzing the relationship among stress, permeability and pore compressibility, and using experiment data of porosity and permeability under high temperature and overlying pressure, a model is constructed to predict the deep low-rank coal reservoirs' permeability based on variable pore compressibility. The results show that this model can predict permeability with variable pore compressibility more accurately than that with constant pore compressibility. The initial compressibility of coal mines in Laojunmiao area is 0.09 MPa^-1, the attenuation coefficient of pore pressure changing with the effective stress is 0.07 MPa^-1, and the initial permeability decreases with increasing temperature. The pore compressibility can be calculated according to its definition. The results demonstrate there is a strong correlation between measured pore compressibility and fitted pore compressibility; with an increase in buried depth, permeability predicted with constant pore compressibility is lower than that with variable pore compressibility. As a result, the deep coal reservoirs' permeability indicates there still exists a CBM exploitation potential in this area, not as predicted before.

Key words: Junggar Basin, deep coalbed methane, permeability, pore compressibility, prediction model

中图分类号:

TE122.14

汪岗, 秦勇, 申建, 赵丽娟, 赵锦程, 李叶朋. 基于变孔隙压缩系数的深部低阶煤层渗透率实验[J]. 石油学报, 2014, 35(3): 462-468.

Wang Gang, Qin Yong, Shen Jian, Zhao Lijuan, Zhao Jincheng, Li Yepeng. Experimental studies of deep low-rank coal reservoirs’ permeability based on variable pore compressibility[J]. ACTA PETROLEI SINICA, 2014, 35(3): 462-468.

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基于变孔隙压缩系数的深部低阶煤层渗透率实验

Experimental studies of deep low-rank coal reservoirs’ permeability based on variable pore compressibility

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