沁水盆地柿庄南区块煤层气藏地质特征

The Geological Characteristics of CBM Reservoir of Southern Shizhuang in Qinshui Basin

沁水煤盆地煤层分布广泛,厚度稳定,煤变质程度高。通过对柿庄南区块的山西组3#、太原组15#煤层的区域构造地质、沉积特征、水文地质条件、煤层气储层等特征的分析,认为该区寺头断层水力封闭,3#煤层顶板以厚泥岩为主,15#煤层顶板为分布稳定的石灰岩层,储层封盖性好,煤层裂隙发育渗透性好,气含量高,储层埋藏深度适中,是煤层气开发的有利区域。

In Qinshui Basin, there exist extensive coal seams, stable in thickness with highly metamorphic grade. The author, by analyzing the structural geology, depositing characteristics, hydro-geological conditions, CBM resources and other factors in No 3, No. 15 coal seams in Southern Shizhuang of this basin, puts forward the view that this area is suitable for developing CBM because in Shitou Fault, the water is sealed, in No. 3 Group, the floor seam is mainly consisted of thick mudstones, in No. 15 Group, the floor is consisted of stable lime stones, and it is well sealed with high content of gas while the coal seam is buried in appropriate depth.