摘要
本文基于油气成藏组合、油气来源、油气相态等对比、分析,探讨了珠江口盆地西部南断裂带西、中、东段油气成藏特征及其差异性主控因素,发现自西向东成藏组合、油气来源和油气相态存在明显差异,其中构造活动差异是南断裂带油气成藏特征差异的主控因素。依据构造样式、有效烃源岩—油气藏差异,构建了南断裂带三种油气成藏模式:①西段为"两期反转—文昌源型",油气生成、成藏与分布受早渐新世恩平期、中中新世韩江期反转构造活动控制,始新统文昌组为有效烃源岩,石油沿沟源断裂垂向运移,形成新近系—古近系复式成藏;②中段为"晚期反转—恩平源型",受南断裂伸展活动、构造沉降横向差异性和韩江期反转构造活动控制,下渐新统恩平组为有效烃源岩,油气沿沟源断裂垂向运移,形成新近系—古近系多期、叠合成藏;③东段为"持续伸展—文昌、恩平双源型",受南断裂同沉积断裂活动、构造沉降中心向东迁移控制,文昌组、恩平组为两套有效烃源岩,油气沿沟源断裂垂向运移,形成古近系多源、多期成藏。
Based on the comparison of play source rock and hydrocarbon phase,hydrocarbon pooling characteristic and difference in the south fault belt from west to east have been summarized,and tectonic movement difference was thought to be the main controlling factor causing difference of hydrocarbon pooling characteristic in south fault belt,West Pearl River Mouth Basin.Three kinds of multihydrocarbon pooling patterns have been put forward by the differences of structural style and valid source-hydrocarbon:the first pooling pattern is 'two periods of tectonic inversion—Wenchang source rock-derived' developed in the west segment of the south fault belt.Hydrocarbon generating,pooling and distribution are controlled by early Oligocene Enping period and mid-Miocene Hanjiang period tectonic inversion movements.Hydrocarbon derived from Eocene Wenchang Formation was characterized by multi-pooling.The second pooling pattern 'late tectonic inversion—Enping source rock' existed in the middle segment of the south fault belt,hydrocarbon generating,pooling and distribution are controlled by lateral extension difference,tectonic subsidence difference and Mid-Miocene Hanjiang period tectonic inversion movement,hydrocarbon derived only from Lower Oligocene Enping Formation,characterized by multi-period pooling and vertically well-superpositioned pooling.The pooling third pattern is the 'continuous extension—Wenchang and Enping dual source rock' existed in the east segment of south fault.Hydrocarbon generating,pooling and distribution are controlled by growth fault movement and tectonic subsidence shift towards east,and hydrocarbon derived from both Wenchang Formation and Enping Formation,characterized by multi-source and multi-period pooling.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2012年第5期786-794,844+680-681,共9页
Oil Geophysical Prospecting
基金
国家重大专项课题"近海富烃凹陷资源潜力再评价和新区
新领域勘探方向"(2008ZX05023-01)资助
关键词
珠江口盆地
南断裂带
油气成藏特征
构造活动差异
成藏模式
West Pearl River Mouth Basin,south fault belt,hydrocarbon pooling characteristics,difference of tectonic movement,hydrocarbon pooling pattern
