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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。
The Tinga fault in the southwestern South China Sea is a huge strike-slip fault located between the Nansha block and the Zengmu block, which is obviously reflected in gravity and magnetic anomalies and seismic reflection profiles. Igneous rocks develop along the fault zone. The most important feature of the Tingya fault is its strike-slip nature. Its strike-slip direction changes with the mutual misalignment of the three blocks, namely, the Nansha block, the Zengmu block and the Borneo block. In the Oligocene, , Miocene and Late Miocene - Quaternary, from the beginning of the right-handed into a left-handed, then turned to dextral. The tilt of the Tingya fault caused the deposition of huge Cenozoic sediments in the Zengmu and Brunei basins. The fault associated structures (secondary faults and folds) strongly control the formation of oil and gas. For example, fault block structure and rolling anticline are the most favorable trap structures in the Zengmu and Brunei basins. Both sides of the fault are favorable hydrocarbon prospects.