曾母拉分盆地的油气成藏规律:廷贾-西巴兰线断裂的控制  

HYDROCARBON ACCUMULATION IN ZENGMU PULL-APART BASIN:INSIGHTS FROM THE CONTROL OF TINJAR-WEST BARAM LINE

作　　者：赵斐宇 姜素华[1,2] 李三忠[1,2] 孟凡顺[1,2] 曹伟[1,2] 汪刚[1,2] 张慧璇 高嵩[1,2] 郑祺亮[1,2] ZHAO Feiyu JIANG Suhua LI Sanzhong MENG Fanshun CAO Wei WANG Gang ZHANG Huixuan GAO Song ZHENG Qiliang(Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China College of Marine Geosciences, Ocean University of China, Qingdao 266100, China)

机构地区：[1]海底科学与探测技术教育部重点实验室,青岛266100 [2]中国海洋大学海洋地球科学学院,青岛266100

出　　处：《海洋地质与第四纪地质》2017年第4期209-220,共12页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金杰出青年基金(41325009);国家重点研发计划(2017YFC0601400-1);山东省泰山学者特聘教授项目

摘　　要：南海南部廷贾-西巴兰线断裂是一条规模巨大的北西向走滑断裂,渐新世开始活动,早期具有强烈的右旋走滑特征,晚中新世以来走滑方向变为左旋,更新世至今,走滑方向变为右旋,是曾母盆地与北康盆地、南沙海槽的分界。为了理清廷贾-西巴兰线断裂特征与曾母盆地油气成藏的关系,通过对断裂两侧地震剖面特征、重磁特征、地热流分布特征以及地壳性质和岩石圈厚度的分析,探讨该断裂在曾母盆地形成演化及油气成藏中的控制作用。研究表明:断裂活动为曾母盆地后期的沉积提供了丰富的物源,断裂走滑作用导致曾母盆地具有良好的圈闭,后期的反向走滑使得盆地的沉积中心由南向北迁移;断裂沟通深部热源,有利于油气生成,形成的伴生断层是盆地油气运移的主要通道。The Tinjar-West Baram Line of the Southern South China Sea is a northwest-trending strike-slip fault. As the boundary between the Zengmu Basin and the Beikang Basin and Nansha Trough, the strikeslip fault of the Tinjar-West Baram Line was first activated in Oligocene as a intensely dextral strike-slip fault, then turned to sinistral after late Miocene and, then turned to dextral again since Pleistocene up to present. Based upon the study of seismic profiles, gravity and magnetic data, geothermal heat flux distri- bution data near the Tinjar-West Baram Line, we studied the crustal nature and lithosphere thickness of the Zengmu Basin, and discussed the control of Tinjar-West Baram Line over the evolution and accumula- tion of hydrocarbon in the Zengmu Basin. It is concluded that the faulting of the Tinjar-West Baram Line had provided rich source of sediments for the Zengmu Basin. The strike slipping of the faults helped the formation of the good traps in the Zengmu Basin, and the reversed strike slipping in the late period led to the northward motion of the basin depocenters. The faults are important channels to the deep heat source, beneficial to the hydrocarbon generation, and the secondary faults are also the major passages for hydrocar- bon migration.

关 键 词：廷贾-西巴兰线断裂 走滑作用 油气成藏 曾母盆地 

分 类 号：P618.13[天文地球—矿床学]