不同煤储层条件下煤岩微孔结构及其对煤层气开发的启示  

Micropore structure of coals under different reservoir conditions and its implication for coalbed methane development

作　　者：范俊佳[1,2] 琚宜文[3] 柳少波[2] 李小诗[3] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]中国石油勘探开发研究院提高石油采收率国家重点实验室,北京100083 [3]中国科学院计算地球动力学重点实验室地球科学学院中国科学院研究生院,北京100049

出　　处：《煤炭学报》2013年第3期441-447,共7页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2009CB219601);国家自然科学基金资助项目(40972131;41030422)

摘　　要：在现场宏观观测的基础上,采用显微镜下观测、镜质组反射率测试及低温氮吸附方法,对沁水盆地和淮北煤田不同矿区煤岩的变质变形作用与微孔结构特征进行了深入研究。结果表明:高变质强变形—较强变质煤储层(Ⅰ类)和中变质较强变形煤储层(Ⅲ类)有利于煤层气的富集,不利于煤层气的扩散和渗流;高变质弱变形煤储层(Ⅱ类)和中变质弱变形煤储层(Ⅳ类)较有利于煤层气的富集,也有利于煤层气的渗流;低变质强变形煤储层(Ⅴ类)有利于煤层气的富集,但不利于煤层气的解吸和渗流。由此,沁水盆地南部及淮北煤田中南部是煤层气勘探开发的有利区域。This paper analysed micropore structure of coal samples from coalmines of Qinshui basin and Huaibei coalfield by using micro-macroscopic observation,R_o testing,and low temperature nitrogen adsorption method.Results indicate that there are five different coal reservoir types in the study areas.High grade metamorphic and relatively strong to strong deformed coal reservoir(typeⅠ) and medium grade metamorphic and relatively strong deformed coal reservoir(typeⅢ) are favourable for coalbed methane(CBM) accumulation,but disadvantageous to CBM seepage; high grade metamorphic and relatively weak deformed coal reservoir(typeⅡ) and medium grade metamorphic and relatively weak deformed coal reservoir(typeⅣ) are advantageous to CBM accumulation and seepage;low grade metamorphic and strong deformed coal reservoir(typeⅤ) is favourable for CBM accumulation,but not advantageous to CBM desorption and seepage.Consequently,southern part of Qinshui basin and south-central of Huaibei coal field are potential areas for coalbed methane exploration and development.

关 键 词：煤储层 微孔结构 煤层气 变质作用 变形作用 

分 类 号：TD84[矿业工程—煤矿开采]