断裂时空差异性演化及其对生烃凹陷形成的控制——以珠江口盆地珠三坳陷为例  

Space-time diversity evolution of faults and its control on formation of hydrocarbon generation sag:Taking Zhu Ⅲ Depression in Pearl River Mouth Basin as an example

作　　者：陈少平 王华[2] 刘丽芳 黄胜兵 武涛[3] 魏杨旭 

机构地区：[1]中海油研究总院,北京100028 [2]中国地质大学,湖北武汉430074 [3]中国石化中原油田分公司采油三厂,山东莘县252434 [4]西安石油大学地球科学与工程学院,陕西西安710300

出　　处：《断块油气田》2015年第1期1-6,共6页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题"近海大中型油气田形成条件及勘探技术"(2008ZX05023-001)

摘　　要：利用断层活动速率分析了珠江口盆地珠三坳陷南部主干断层的活动历史,并利用研究结果分析了断裂时空差异性演化对生烃凹陷形成的控制。恩平组以前珠三坳陷西南部断层活动性较强,而东北部则相对较弱,恩平组以后,珠三坳陷西南部断层活动性较弱,而东北部相对较强,从而使文昌组—恩平组珠三坳陷的沉降中心明显发生了由西南到东北的迁移。珠三南断裂在研究区内为一条包括3段、3种类型、控制3个大规模断凹的大型复杂断裂,不同凹陷内烃源岩分布差异明显,主要体现在烃源岩的规模、类型及热演化程度等方面存在较大差异,这些差异主要是由于珠三坳陷控坳主干大断裂在时空上差异性演化的结果,据此将珠三坳陷划分为WC￣A,WC￣B,WC￣C等3个相对独立的成油体系。By exerting the fault activity rate, the evolution characteristics of trunk faults in south part of Zhu Ⅲ Depression are studied,and then, using research result,the space-time diversity evolution of faults and its controls on the formation of hydrocarbon kitchen is studied. The result shows that the fault activity is stronger in southwest than in northeast before Enping Formation and that is contrary after Enping Formation, which makes subsidence center migrate from southwestern to northeast in the period of Wenchang Formation to Enping Formation. South Fault of Zhu Ⅲ Depression is a complex large-scale fault which has three different parts and types, and controls the formation of three large-scale sags. The distribution of source rock is different in different sag and the type and maturity degree of source rock are quite different in different sag, which is the result of space-time diversity evolution of faults. Based on this,Zhu Ⅲ Depression is divided into three different petroleum systems, including WC-A,WC-B,WC-C.

关 键 词：生烃凹陷 断裂 成油体系 珠三坳陷 

分 类 号：TE121.11[石油与天然气工程—油气勘探]