不同变质变形煤特征对煤层气富集渗流的制约  

Characterization of Different Metamorphic-deformed Coals and Its Restriction on Coalbed Methane Accumulation and Flow

作　　者：范俊佳[1,2] 柳少波 张喜[3] 桂丽黎 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油集团盆地构造与油气成藏重点实验室,北京100083 [3]中国五矿勘查开发有限公司,北京100044

出　　处：《科学技术与工程》2013年第25期7468-7471,7487,共5页Science Technology and Engineering

基　　金：国家"973"重点基础研究发展计划项目(2009CB219601);中国石油天然气集团股份公司重大科技项目(2011-0203A)资助

摘　　要：煤岩是煤层气的主要储集层,其变质变形作用对煤层气的赋存、运移和开发都具有重要意义。以华北地区典型含煤区为研究区,基于现场资料分析、煤岩显微观测,孔渗测试及压汞实验分析,探讨了不同变质变形煤储层孔渗特征,并从裂隙、孔隙不同尺度探讨了不同变质变形煤储层特征及其孔、裂隙结构特征对煤层气富集渗流所起的作用。结果表明,首先,煤层气产出过程与煤储层变质变形特征密切相关;实验室测定的渗透率与试井渗透率具有可比性,一般碎斑煤大于碎裂煤;高变质弱变形煤储层和中变质弱变形煤储层煤层气的富集能力与渗流能力比较强。Coal is the reservoir for coalbed methane accumulation, its metamorphism and deformation are close- ly related to coalbed methane occurrence, migration and development. Based on the field data analysis, microscop- ic observation, porosity-permeability testing and mercury porosimeter analysis, the property characteristics of differ- ent metamorphic and deformed coals from typical coal-bearing coalfields are disscussed, explore the coal reservoir features and the effects of fracture-pores on coalbed methane accumulation and flow are explored. Results indicate that the production of coalbed methane is bond up with metamorphism and deformation of coal reservoirs. Further- more, permeability value from laboratory testing is consistent with that from logging and generally, the permeability of mortar coal is greater than that of cataclastic coal. Thirdly, high metamorphic and weak deformed coal and medi- um metamorphic and weak defromed coal are advantageous for coalbed methane accumulation and flow.

关 键 词：变质变形 煤岩 煤层气 富集渗流 

分 类 号：TE122.23[石油与天然气工程—油气勘探]