岩性油气藏 ›› 2023, Vol. 35 ›› Issue (3): 110125.doi: 10.12108/yxyqc.20230310
杨润泽1, 赵贤正2, 刘海涛1, 李宏军2, 赵长毅1, 蒲秀刚2
YANG Runze1, ZHAO Xianzheng2, LIU Haitao1, LI Hongjun2, ZHAO Changyi1, PU Xiugang2
摘要: 煤系烃源岩是渤海湾盆地黄骅坳陷古生界含油气系统的主要烃源岩,源内和源下油气聚集机制和油气成藏过程不清。基于测井、录井、地震资料,结合烃源岩地球化学分析、储层岩心测试、包裹体测试、物理模拟实验等多种手段,探讨了渤海湾盆地黄骅坳陷古生界源内及源下油气聚集机制和成藏过程。研究结果表明:①黄骅坳陷古生界源内储层可有效聚集油气,紧邻的煤系地层烃源岩可优先对其供烃,稳定的构造背景使源内油气藏得到良好的保存。②研究区源下储层油气成藏的2个必要条件为:上部终止于煤系内部且下部连接奥陶系储层的断裂系统,且低角度断裂的油气输导效率更高;源储间存在大于10 MPa的压差,可为源下储层的油气成藏提供良好的动力。③研究区源内及源下油气藏具备早晚2期成藏、中期破坏的特征。中白垩世,低熟的煤系原油大量充注于储层中;白垩纪末期,地层的强烈抬升使古油藏遭受破坏或调整;新生代,随着烃源岩进一步成熟并生、排烃,形成了大量煤型气和轻质油油气藏。④研究区烃源岩有效充注范围内,储层相对优质、构造相对稳定的区域为源内勘探有利区,印支期逆冲断裂发育、受后期伸展作用改造较弱的区域为源下勘探有利区。
中图分类号:
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