河南胡襄煤田煤储层孔裂隙系统及其对煤层透气性的影响  

Coal Reservoir Pore-Fissure System of Huxiang Coalfield in Henan and its Influence on Coal-Seam Permeability

作　　者：苗书雷[1] 许亚坤[1] 王昆[1] 张连强[1] 付海英[1] 

机构地区：[1]河南省地质矿产勘查开发局第四地质矿产调查院,河南商丘476000

出　　处：《资源导刊（地球科技版）》2014年第12期25-28,共4页

摘　　要：本文采用宏观描述、扫描电镜和压汞实验的方法对胡襄煤田煤储层孔裂隙发育特征进行分析，并研究其孔隙连通性和孔径分布特征发现：①二2煤层的构造破坏程度弱于二1煤层，割理发育密度较大，面间距较宽，充填物少，暗示着二2煤储层的透气性要好于二1煤层；②煤样中以过渡孔最发育，其次为微孔和大孔，中孔相对最不发育，但二1煤储层过渡孔和微孔含量均要大于二2煤层，且随着煤体结构破坏程度的加深，总孔容有增大的趋势；③煤田原生结构煤和糜棱煤半封闭孔含量相对较高，孔隙连通性较差，而碎裂煤、碎粒煤开放性孔隙含量相对较高，一定程度上有利于煤层气的运移；④地质构造的破坏作用，增强了煤中不同孔径段孔隙分布的均衡性。Via analyzing pore-fissure characteristics of Huxiang coalfield coal reservoir in the way of macroscopic description, SEM and mercury-injection experiment and studying its connectivity of pores and distribution of pore-size, the results show that：①Less structure damage of Ⅱ2 coal-seam than Ⅱ1 and Ⅱ2 coal-seam have bigger cleat-density, wider identity-distance, fewer filling and this means permeability of Ⅱ2 coal-seam is better than Ⅱ1 coal-seam;②The most developing pore is the transition pores and the second is the micropores and big pores, the mesopores is the last. But the transition pores and micropores of Ⅱ1 coal-seam all are more than Ⅱ2 coal-seam and with the deepening of coal-body structure damage, the total pore -volume is increasing;③The underformed coal and mylonitic coal have more semi-closed pores that result in the connectivity of pores poorer, though the cataclastic coal and fragmented coal have more opening pores, this will benefit the migration of CBM;④The architectonic damage enhance the balance of pore distribution of different pore-size.

关 键 词：胡襄煤田 孔裂隙 透气性 孔隙连通性 孔径分布 

分 类 号：P618.11[天文地球—矿床学]