王翘楚;陈冬霞;宋国奇;王永诗;张碧璇;王福伟;王梓颐;

• 1:中国石油大学(北京)油气资源与探测国家重点实验室

• 2:中国石化胜利油田分公司

摘要(Abstract)：

临南洼陷沙河街组三段地层低压明显,与邻近凹陷特征明显不同。根据临南洼陷沙三段37口探井、99个地层压力实测数据,结合定性判断和定量计算,分析低压分布特征及成因机制。结果表明:临南洼陷低压区域主要分布于中央隆起带之上的临盘及商河地区,在洼陷西部和西南部边缘也有发育,压力因数为0.82~0.95。异常低压主要与地层剥蚀卸载、地层降温及断层控制作用有关。地层剥蚀卸载引起压力下降幅度为1.00~8.43 MPa,是形成异常低压的主要因素;地层降温引起压力下降幅度为0.50~3.00 MPa。研究区临商断裂带、夏口断裂带主体断层及洼陷西南部边缘断层的封闭性较好,低压区域被保存;临商断裂带西侧部分断层封闭性较差,局部低压区域被破坏。该研究结果为临南洼陷下一步油气勘探提供指导。

关键词(KeyWords)：异常低压;形成机制;地层压力;地层剥蚀卸载;沙河街组三段;临南洼陷

Abstract:

Keywords:

基金项目(Foundation):

作者(Author):王翘楚;陈冬霞;宋国奇;王永诗;张碧璇;王福伟;王梓颐;

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