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珠江口盆地文昌凹陷NW向断裂的发育特征及其对盆地演化的影响
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Abstract:
文昌凹陷位于珠江口盆地西部的珠三坳陷内，是我国南海西部地区重要的产油地区之一。凹陷内部断裂体系复杂，发育NE-SW、近E-W和NW-SE向断裂。目前关于凹陷内部NW向断裂的成因机制研究还较少。通过对文昌凹陷内三维地震资料的解析和构造分析，本文揭示了NW向断裂的几何学和运动学特征，根据NW向断裂的时空分布特征，将凹陷演化过程划分为三个阶段：裂陷早期伸展阶段、裂陷晚期伸展–走滑阶段和裂后期走滑阶段。NW向断裂影响了裂陷期凹陷构造的划分和沉积中心的分布，并对裂后期断块活动和油气的圈闭、迁移和保存具有一定的控制作用。
Wenchang Sag is one of the important oil-producing areas in the western South China Sea. It is located in the Zhu III depression in the western Pearl River Mouth Basin. The fault system in the depression is complex, with NE-SW, near E-W and NW-SE trending faults. There are fewer studies on the causative mechanisms of NW trending faults within depressions. Based on the analysis of 3D seismic data in Wenchang Sag, the geometric and kinematic characteristics of the NW trending fault have been revealed. According to the temporal and spatial distribution rule, the evolution of NW trending faults in the sag can be divided into three stages: the early extension stage, the late extension-strike-slip stage and the late sinistral strike-slip stage. The NW trending faults affect the division of sag structure and the distribution of depositional center, and control the activity of fault block and the trapping, migration and preservation of oil and gas in the late fracture period.
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