珠江口盆地珠三坳陷断层特征及其对油气成藏的控制作用  

FAULT CHARACTERISTICS AND CONTROL ON PETROLEUM ACCUMULATION IN THE ZHU Ⅲ DEPRESSION,THE PEARL RIVER MOUTH BASIN

作　　者：姜华[1] 王华[1] 李俊良[2] 林正良[1] 方欣欣[1] 蔡佳[1] 吕学菊[1] 

机构地区：[1]中国地质大学资源学院,武汉430374 [2]中国海洋石油有限公司湛江分公司技术部,广东湛江524057

出　　处：《石油实验地质》2008年第5期460-466,共7页Petroleum Geology & Experiment

基　　金：国家自然科学基金项目(40702023)

摘　　要：珠江口盆地珠三坳陷是一个断裂系统十分发育的箕状断陷盆地,其形成和演化受断裂强烈控制。在坳陷内主干断裂的控制下,坳陷分割为文昌A凹等9个构造单元,其中,文昌A,B,C凹陷为生油凹陷。断裂以北东东向为主,按照主干断裂和次级断裂的组合形态,平面上可划分出平行、雁列、帚状、"入"字型等4种组合样式;剖面上可划分为同斜"Y"型、反斜"Y"型、复合"Y"型、同向断阶等4种组合样式。断裂对油气成藏的控制作用主要包括对烃源岩分布、储集体发育和展布、油气生成和运聚的控制。该作用表现为有利和不利2个方面,通过分析,确定将主干断裂,特别是"Y"型断层发育地区作为珠三坳陷下一步油气勘探的重点区,而距离生油中心较远、受断层阻断运移通道的边缘隆起带应作为远景目标给予进一步研究。The Zhu Ⅲ Depression in the Pearl River Mouth Basin is a halfgraben-like depression with well-developed fault system. Formation and evolution of the depression have been controlled by faults. Controlled by main faults, the depression can be divided into 9 tectonic units such as the Wenehang A Sag, among which the Wenchang A, B and C Sags are petroleum generative. Faults in the depression are mainly NEE oriented. According to combination of the main and the secondary faults, there are 4 combination styles in plane, including parallel, en echelon, broom-like and ‘入’ like. In section, there are al- so 4 combination styles, including homoclinal‘Y’-like, reverse ‘ Y’-like, complex ‘Y’-like and accordant fault step. Faults control source rock distribution, reservoir generation and distribution as well as petroleum generation and migration. The controlling effects may be favorable or unfavorable. The main faults, especially the ‘Y’-like faults generative region, are the key targets for petroleum exploration in the Zhu Ⅲ Depression. Uplifts along the edge of the depression which are far away from oil generation center and blocked by faults should be taken as long-term targets.

关 键 词：断裂分级 断层组合样式 油气成藏 珠三坳陷 珠江口盆地 

分 类 号：TE121.1[石油与天然气工程—油气勘探]