• 非常规天然气 • 下一篇
胡东风
Hu Dong-feng
摘要: 四川盆地东南部地区盆缘槽档转换带和盆外隔槽式构造带向斜发育,由于其整体抬升时间长,构造运动强烈,剥蚀量大,区域保存条件相对复杂,导致不同向斜五峰组—龙马溪组为常压且页岩气含气性差异较大。在研究区向斜构造五峰组—龙马溪组页岩发育特征、后期保存条件、含气性等差异的基础上,分析了向斜构造页岩气富集主控因素,并总结了3种有利于页岩气保存富集的构造样式。研究结果表明:优质页岩发育是页岩含气性的物质基础,川东南地区盆缘和盆外向斜五峰组—龙马溪组优质页岩发育,页岩气物质条件相似;保存条件是影响页岩含气性差异的关键因素,页岩地层埋深大、地层倾角小、远离剥蚀区和发育反向逆断层,有利于页岩气的保存,总体上盆缘槽档转换带内向斜构造保存条件更好,盆外隔槽式构造带内向斜较差;盆缘槽档转换带复向斜构造内“洼中隆”断背斜、宽缓残留向斜中心、逆断层侧向遮挡向斜3种构造样式有利于页岩气的富集。
中图分类号:
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