焦石坝外围构造复杂区不同地区页岩气典型井解剖

Anatomy of Typical Shale Gas Wells in Different Regions of the Complex Structure Surrounding Jiaoshiba

摘要: 随着页岩气勘探开发工作的快速推进，页岩气富集、保存的复杂性逐渐显现出来。尤其在构造复杂区，构造、断裂对于页岩气富集、保存的影响认识还不够深入，严重影响了页岩气目标评价、勘探部署以及高效勘探。虽然在焦石坝外围复杂构造区页岩气勘探取得重大突破，但钻探情况仍不太乐观。本文通过对焦石坝外围构造复杂区不同地区页岩气典型井进行详细解剖，从压力系数、断裂、裂缝、构造特征、顶底板、含气性等方面对典型井进行分析，认识到不同地区含气性存在较大的差异。川东南地区距离东南部雪峰造山带越近，保存条件总体变差；盆外向斜宽缓、埋深越深、断裂越不发育，保存条件则越好；盆缘复杂构造区保存条件均较差。

Abstract: With the rapid progress of shale gas exploration and development, the complexity of shale gas ac-cumulation and preservation is emerging gradually. The impact of preservation is not well under-stood, which seriously affects shale gas target evaluation, exploration deployment and efficient exploration, especially in complex structural areas, structures and faults. Although a major breakthrough has been made in shale gas exploration in the complex structural area around the Jiaoshiba, the drilling situation is still not optimistic. In this paper, the typical shale gas wells in different regions in the complex structural areas around the Jiaoshiba are dissected in detail, ana-lyzed from the aspects of pressure coefficient, fracture, fracture, structural characteristics, roof and floor, gas bearing properties, etc, which is recognized that there are significant differences in gas content in different regions. The closer Southeast Sichuan is to the Xuefeng orogenic belt, the worse the preservation condition is; extrabasinal syncline width is slow, buried depth is deeper, fracture is less developed, preservation condition is better; the complex structure condition of basin edge is poor.