摘要
南海西南部地区的廷贾断裂是一条位于南沙地块和曾母地块之间的巨大走滑断裂,在重力、磁力异常和地震反射剖面上均有明显的反映,沿断裂带发育有火成岩。廷贾断裂最为重要的特征是其走滑性质,其走滑方向随着南沙地块、曾母地块和婆罗洲地块三大块体的相互错动方向的改变而改变,在渐新世、中新世和中新世末期-第四纪,由开始的右旋变为左旋,然后又变为右旋。廷贾断裂的掀斜作用使曾母盆地和文莱盆地沉积了巨厚的新生代沉积物。而断裂的伴生构造(次级断裂和褶皱)对油气的形成有强烈的控制作用,如断块构造和滚动背斜是曾母盆地和文莱盆地最为有利的圈闭构造。断裂两侧是有利的油气远景区。
Tingjia fault, located in the southwestern South China Sea, is a giant strike slip fault. It is apparent in gravity, magnetic and seismic features, and igneous rocks developed along the fault. The strike slip feature and its slip orientation are controlled and varied by the inter- action of Nansha, Zengmu and Boneo Bolocks , i. e. from Oligocene, through Miocene, to late Miocene-Quaternary, the fault's stricke slips are dextral, sinistral and dextral again accord- ingly. It is due to the development of Tingjia fault that the thick Cenozoic sediments might be deposited in basins of Zengmu and Wenlai. Its associated local structures, for example, fault blocks and rollover anticlines in Zengmu and Wenlai basins are very benefit to trap oil and gas, and there will be favourable tagerts beside the two sides of the fault.
出处
《南海地质研究》
1995年第7期53-58,共6页
Gresearch of Eological South China Sea
