岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 19.doi: 10.12108/yxyqc.20210401
• 油气地质 • 下一篇
杨荣军1,2, 彭平3, 张静2, 叶茂3, 文华国4
YANG Rongjun1,2, PENG Ping3, ZHANG Jing2, YE Mao3, WEN Huaguo4
摘要: 四川盆地东部地区边缘带上古生界构造复杂,对地层格架及地质规律认识不清,尤其对石炭系残余地层分布及沉积相展布认识欠缺,影响了该区的勘探开发。基于区域地质背景,结合新钻井、新三维地震数据及野外露头资料,首次提出了在奉节—云阳一带发育晚古生代持续古隆起(奉节古隆起)的认识;通过地震模型正演,确定了研究区志留系—泥盆系—石炭系地震反射特征,对奉节古隆起进行了刻画;通过研究古地貌控制下的石炭系地层识别及分布特征、构造演化,分析了石炭系油气成藏的条件,对石炭系有利天然气勘探区带进行预测评价。研究认为:奉节古隆起位于开江古隆起东侧约95 km处,与开江古隆起近于平行,整体近南北向,略偏东,其南北轴向长度约79 km,东西向宽度不等,三维区内平均宽度14 km;在开江古隆起和奉节古隆起的联合约束下,研究区的构造演化可以分为5个阶段:泥盆纪低位期、石炭纪低位期、石炭纪海进—高位期、石炭纪海退期和二叠纪海进期;由于奉节古隆起带长期持续演化,可以形成石炭系地层剥蚀带,随着地层埋深加大,在古隆起周缘的石炭系与志留系泥岩侧向对接,在油气充注前形成地层圈闭,后期经过多期构造影响,仍可能在现今的向斜-斜坡区保存为含气圈闭,可以作为石炭系天然气勘探的远景区。该认识为四川盆地东部石炭系天然气扩展勘探新领域提供了支撑。
中图分类号:
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