黔西比德-三塘盆地煤层群发育特征及其控气特殊性  

Development character and particulartiy of controlling coalbed methane under coal seam groups from Bide-Santang Basin,western Guizhou

作　　者：杨兆彪[1] 秦勇[1,2] 高弟[1,3] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008 [3]贵州省煤田地质局,贵州贵阳550009

出　　处：《煤炭学报》2011年第4期593-597,共5页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(40730422);江苏省研究生创新计划资助项目(CX09B_117Z)

摘　　要：基于17个钻孔和4个探槽的煤层数据及11个勘查区600多个煤芯解吸资料,以0.3 m作为单一煤层厚度的统计下限,采用煤层层数、煤层间距、煤层总厚度来表征黔西比德-三塘盆地煤层群的特征,探讨了各参数之间的相关关系,及煤层层数等值线、煤层间距等值线与煤层甲烷含量等值线之间的空间叠置特征。结果显示:煤层层数越多,煤层间距就越小,煤层厚度就越大,它们之间具有很好的乘幂关系。同时发现煤层层数等值线、煤层间距等值线与煤层甲烷含量等值线分布在空间上高度吻合;在煤层甲烷富集区,甲烷浓度高的区域煤层层数最多,煤层间距最小。由此进一步说明,在煤层群发育区,煤层间距小、砂泥比低、整体煤岩封闭性好导致的煤层之间"叠加"封闭,是煤层气保存的有利条件。Based on statistics of coal-seam and rock-seam from 17 bores and 4 trenches,and management of CBM desorption dates more than 600 from 11 exploration areas,took 0.3 m thick as the statistical minimum of eack coal-seam under coal seam groups,adopted coal seam number,coal seam space and total thickness of coal seam to describe coal seam group character from Bide-Santang Basin,western Guizhou,the correlation of each character parameter,and space superposed character between coal seam number contour,coal seam space contour and average CBM content contour were investigated.The results show that coal seam number is more,the coal seam space is less,and total thickness of coal seam is bigger,there is a better power relation.At the same time,there is a better anastomosis between coal seam number contour,coal seam space contour and CBM content contour,the district of rich CBM and high methane concentration lies in area which coal seam number is more and coal seam space is less.This further shows that in coal seam group development area,there is a small coal seam space and low ration between sand and mud,the whole coal and rock seam good obturation lead the ＂superpose obturation＂between coal seam,which is favorable condition for CBM preservation.

关 键 词：煤层群 煤层气 煤层层数 煤层间距 煤层总厚度 

分 类 号：P618.11[天文地球—矿床学]