黄骅坳陷上古生界古构造恢复

作者:姚芳; 卢异; 王东林; 王亚静; 钟小刚; 马东博; 赵坤山; 周莹
来源:录井工程, 2021, 32(01): 114-119.

摘要

针对黄骅坳陷油气预探对古构造恢复的需求,结合盆地演化特点及相关资料,在对古构造恢复方法进行系统分析、优选的基础上,利用高分辨率三维地震数据,采用古水平面恢复法对黄骅坳陷上古生界进行古构造恢复,证实古水平面恢复方法是断陷盆地地震覆盖区快速开展古构造恢复、研究构造演化的有效手段。通过古构造恢复,认识到黄骅坳陷中生代末期的古构造表现出大型帚状雁列的特点,该巨型帚状构造由乌马营-官西、徐扬桥-孔西-大中旺两个近南北向右阶雁列背向斜带与其东侧一系列北东向撒开的背向斜带组成;除徐西、沧东断裂外,盆内二级断层均产生于渐新世以后,且新生代大规模断裂改造作用也主要发生在渐新世以后,孔店组沉积早、中期的古构造形态与中生代末具有很大相似之处;侏罗纪期间,在南皮至东光一带以及古盐山地区存在古凹陷,凹陷带轴向南北,其间夹持的隆起构造是古生界原生油气一次生烃期间油气运聚的主导方向。该研究成果对古构造恢复方法的选择及研究黄骅坳陷古构造具有重要指导意义。

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