浅析元屯沟井田瓦窑堡组煤层气赋存影响因素

摘要

从沉积作用、构造和水文地质条件三大地质因素的角度出发，研究了子长矿区元屯沟井田瓦窑堡组煤系地层煤层气赋存特征。指出该组地层由于沉积环境多变，成煤规模小，煤层累计厚度薄，导致生气不足；地层无封闭性构造发育，且后期构造演化造成上覆有效盖层厚度小，导致储气能力不足；地层富水性弱致使储层压力偏低，不利于煤层气富集。%From three geological factors of sedimentation , structure and hydrogeology condition , CBM occurrence character-istics of Wayaobu Formation coal-bearing strata in Yuantungou minefield of Zichang mining area were discussed .The results show that the gas generating capacity of Wayaobu Formation strata is low because of variable sedimentary environment , little coal forming scale and thin total thickness of coal seams , gas storage capacity is low due to undeveloped sealing structure and thin thickness of effective cover layer , and the reservoir pressure is low which reduced the gas accumulation because of weak water yield property .