煤层气储层变形机理及对渗流能力的影响研究  

Rock deformation mechanisms and its influence on poecolation ability for CBM reservoirs

作　　者：李相臣[1] 康毅力[1] 罗平亚[1] 

机构地区：[1]西南石油大学,油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《中国矿业》2009年第3期99-102,共4页China Mining Magazine

基　　金：中国石油天然气股份有限公司科技风险创新研究项目(060511-1-6);四川省青年科技基金项目(02ZQ026-042)资助

摘　　要：煤层气储层具有双重孔隙系统,渗透率主要受裂缝控制;煤的吸附特性会引起基质收缩或膨胀,从而使煤层气储层不同于常规油气储层。所以,系统地分析储层变形对渗透率的影响是非常必要的。文中将储层变形分为裂缝体积变化引起的变形、基块弹性压缩引起的变形和基质收缩/膨胀引起的变形三类,探讨了影响储层变形的各主要因素。利用室内实验手段,指出了变形发生的可能性及相应条件下的表现。基于实验研究,建立了储层变形与渗透率变化关系的数学模型。本文对储层变形的深入研究,对制定合理的煤层气开发方案和生产措施十分有益。Coalbed methane reservoir has a dual porosity system and its permeability is majorly controlled by fracture.The absorption of coal will cause matrix contraction or expansion.So that coalbed methane reservoir is different from conventional oil and gas reservoirs.It is very important that the permeability variation is systematically studied by reservoir deformation.Reservoir deformation is divided into fracture volume compression,matrix compression and matrix contraction / expansion in this paper.The major factors of the reservoir deformation are pointed out.The possibility of deformation and corresponding performance under the conditions are studied by experiment.Based on experimental studies,the mathematical model that reflects the relations between deformation and permeability is established.In this paper,the deformation of coalbed is deeply studied.That is more useful for development and production of coalbed methane.

关 键 词：煤层气 变形 机理 渗透率 应力敏感 

分 类 号：TD712.51[矿业工程—矿井通风与安全]