刘义生,金吉能,潘仁芳,李笑天,朱正平

• 1:长江大学地球科学学院
• 2:中国石油长庆油田分公司勘探开发研究院

摘要(Abstract)：

四川盆地及其周缘上奥陶统五峰组-下志留统龙马溪组页岩广泛发育，页岩气资源丰富，盆地内五峰组-龙马溪组页岩气已获得大规模商业突破。渝东南盆缘转换带处于构造变形强烈区域，相对于盆内五峰组-龙马溪组页岩气富集过程，需要对保存条件的评价提出更高的要求。为此，针对渝东南盆缘转换带复杂的构造格局，通过对构造演化、抬升剥蚀、断裂发育、构造样式、顶底板条件、地层压力等多因素叠合分析，开展了保存条件的研究。结果表明，盆缘转换带抬升剥蚀严重，断裂发育，形成了一系列残留构造样式；距离剥蚀边界、大断层近的区域内，五峰组-龙马溪组均有天然气逸散的情况，地层压力系数普遍小于1.2;桑拓坪向斜、武隆向斜大断裂发育较少，五峰组-龙马溪组在远离剥蚀区具有良好的页岩气保存条件。因此后期抬升剥蚀和断裂发育是天然气散失后常压形成的主要原因；尽管由盆内向盆外地层压力系数由超压转变为常压，但构造形成了窄陡残留背斜、宽缓残留向斜和残留斜坡的页岩气保存形式。最后建立了渝东南盆缘转换带常压页岩气保存条件的评价标准，划分了3类有利目标区。

关键词(KeyWords)： 渝东南;盆缘转换带;常压页岩气;保存条件;五峰组-龙马溪组

Abstract:

Keywords:

基金项目(Foundation): “十三五”国家科技重大专项(2016ZX05061-001);; 国家自然科学基金青年基金项目(41804120)

作者(Author): 刘义生,金吉能,潘仁芳,李笑天,朱正平

DOI: 10.19509/j.cnki.dzkq.tb20210768

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