煤岩与顶底板岩石力学性质及对煤储层压裂的影响  

Mechanics characteristics of coal and its roof and floor rock and the effects of hydraulic fracturing on coal reservoir

作　　者：朱宝存[1] 唐书恒[1] 张佳赞[1] 

机构地区：[1]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083

出　　处：《煤炭学报》2009年第6期756-760,共5页Journal of China Coal Society

基　　金：国家高科技发展计划(863)基金资助项目(2006AA06Z235);国家自然科学基金资助项目(40772096);国家重点基础研究发展计划(973)基金资助项目(2006CB202202);教育部新世纪优秀人才支持计划(NCET-05-0211)

摘　　要：基于不同地区煤岩及顶、底板岩石样品的力学性质数据,总结了主要岩石类型的力学性质特征,重点对两者力学性质的差异进行了对比研究,分析了决定岩石力学性质的主要控制因素,如岩性、孔隙特征和含水率.以此为基础讨论了两者力学性质差异对煤储层水力压裂的影响.研究表明,岩石的强度随孔隙度的增大而减小;岩石的软化性取决于岩石的矿物组成与孔隙性,水分对不同岩性岩石强度的影响方式和影响程度存在差异.力学性质的差异,影响了煤层中地应力场的分布,使得煤层气井水力压裂表现出与常规储层水力压裂不同的特点.Based on the mechanical properties of coal and its roof and floor rock from different area, the mechanics characteristics of main rock types were summarized, and the difference of rock mechanics properties among them was discussed. The lithologic features, pore characteristics, water content and other main controlling factors of rock mechanics properties were analyzed. The effect of mechanical difference on hydraulic fracturing was studied system- atically. The results show that rock strength decreases with the increase of porosity, and there are differences in in- fluence mode and degree of water content on rock strength of different lithologic rock. The rock softening is mainly determined by its mineral composition and porosity. Due to the difference of rock mechanics properties between coal and its roof and floor rocks, stress field distribution in coal seam is affected, and hydraulic fracture in coalbed methane well shows different characteristics compared with conventional reservoir fracturing.

关 键 词：煤岩 顶 底板岩石 力学性质 水力压裂 

分 类 号：TD313[矿业工程—矿井建设]