煤层气赋存的两大地质控制因素  

Two major geological control factors of occurrence characteristics of CBM

作　　者：王怀勐[1,2] 朱炎铭[1,2] 李伍[2] 张建胜[2] 罗跃[2] 

机构地区：[1]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221116 [2]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《煤炭学报》2011年第7期1129-1134,共6页Journal of China Coal Society

基　　金：国家自然科学重点基金资助项目(40730422);国家基础研究发展计划(973)资助项目(2009CB219605);国家科技重大专项资助项目(2008ZX05034-04)

摘　　要：探讨了构造演化和水动力条件对煤层气赋存的影响机理,并结合实例分析了河北赵各庄井田的煤层气赋存特征。研究表明:构造控制着煤层气生成、聚集、产出过程的每一环节;煤层水溶解了部分煤层气,同时控制着煤储层的压力,水的流动将直接影响煤层气的吸附解吸程度。赵各庄井田现今煤层气的赋存特征主要是构造与水动力条件综合影响的结果,井田构造特征具有明显的分区性:Ⅰ区和Ⅱ区构造较发育,逆冲、压扭性断层对煤层气有很好的封堵作用;Ⅲ区受开平向斜控制,煤层气含量在向斜核部明显较大。同时,井田水文地质边界条件为封闭或半封闭的,而且由于井田所在的开平向斜北西翼受水力封堵作用影响,煤层气封存条件较好。Studied the impact mechanism of the structural evolution and hydrodynamic conditions,and analyzed the CBM occurrence characteristics of Zhaogezhuang mine field.The research shows that the structures control CBM production,accumulation and output,water dissolves part of the gas and control the coal pressure,and the flow of water directly influences the degree of CBM adsorption-desorption.The present CBM characteristics of Zhaogezhuang mine field are the results of combined effects of structures and hydrodynamic conditions,and the structural characteristics has a clear partition：the structures develop in the part Ⅰ and Ⅱ,where CBM is blocked by thrust faults and compressive-torsional faults;the part Ⅲ is controlled by Kaiping syncline,and the CBM content is much more higher in syncline core.Moreover,there is a closed or semi-enclosed hydrogeological environment in the mine field and a hydraulic-blocking function in the north-west limb of Kaiping syncline,which benefit for the CBM saving.

关 键 词：煤层气 赋存 构造演化 水动力条件 开平向斜 

分 类 号：P618.11[天文地球—矿床学]