沁水盆地高家庄井田煤层气赋存特征及资源潜力评价

Occurrence Characteristics And Resource Potential Evaluation of Coalbed Methane in Gaojiazhuang Well Field of Qinshui Basin

基于研究区煤层气参数井等资料,针对盖层、储层物性等赋存特征予以分析,初步认为研究区煤层煤质变质程度高,以镜质组为主的煤岩显微组分,有利于煤层气的生成,但研究区中部断裂构造密集,围岩封闭效果较差,西部埋深较大,储层物性特性较差,均不利于煤层气的富集和保存。采用体积法估算了研究区内3#和15#煤层的煤层气资源量。评价结果认为研究区煤层气资源属中等埋藏深度的小型煤层气田,地质储量丰度较低,开采价值有限,建议进一步加强勘探,查清煤层气赋存。

Based on the parameter data of coalbed methane wells in the study area,an analysis is conducted on the occurrence characteristics of cap rocks and reservoir properties.It is preliminarily believed that the degree of coal metamorphism in the study area is high,and the microscopic components of coal rock,mainly composed of vitrinite,are conducive to the generation of coalbed methane.However,the central part of the study area has dense fault structures,poor sealing effect of surrounding rocks,and the western part is deeply buried,resulting in poor reservoir properties,which are not conducive to the enrichment and preservation of coalbed methane.The volume method was used to estimate the coalbed methane resources of No.3 and No.15 coal seams in the study area.The evaluation results show that the coalbed methane resources in the study area belong to small coalbed methane fields with medium burial depth.The abundance of geological reserves is low and the mining value is limited.It is suggested to further strengthen the exploration and find out the occurrence of coalbed methane.