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The mechanism of post-rift fault activities in Baiyun sag, Pearl River Mouth basin

机译：珠江口盆地白云凹陷裂谷后断层活动机制

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摘要

Post-rift fault activities were often observed in deepwater basins, which have great contributions to oil and gas migration and accumulation. The main causes for post-rift fault activities include tectonic events, mud or salt diapirs, and gravitational collapse. In the South China Sea continental margin, post-rift fault activities are widely distributed, especially in Baiyun sag, one of the largest deepwater sag with its main body located beneath present continental slope. During the post-rift stage, large population of faults kept active for a long time from 32 Ma (T70) till 5.5 Ma (T10). Seismic interpretation, fault analysis and analogue modeling experiments indicate that the post-rift fault activities in Baiyun sag between 32 Ma (T70) and 13.8 Ma (T30) was mainly controlled by gravity pointing to the Main Baiyun sag, which caused the faults extensive on the side facing Main Baiyun sag and the back side compressive. Around 32 Ma (T70), the breakup of the continental margin and the spreading of the South China Sea shed a combined effect of weak compression toward Baiyun sag. The gravity during post-rift stage might be caused by discrepant subsidence and sedimentation between strongly thinned sag center and wing areas. This is supported by positive relationship between sedimentation rate and fault growth index. After 13.8 Ma (T30), fault activity shows negative relationship with sedimentation rate. Compressive uplift and erosion in seismic profiles as well as negative tectonic subsiding rates suggest that the fault activity from 13.8 Ma (T30) to 5.5 Ma (T10) might be controlled by the subductive compression from the Philippine plate in the east.
机译：在深水盆地经常观察到裂谷后的断层活动，这对油气的运移和聚集有很大贡献。裂谷后断层活动的主要原因包括构造事件，泥浆或盐的扩散以及重力塌陷。在南海大陆边缘，裂谷后断层活动广泛分布，尤其是白云凹陷，它是最大的深水凹陷之一，其主体位于目前的大陆斜坡之下。在裂谷后阶段，从32 Ma（T70）到5.5 Ma（T10），大量的断层长时间保持活跃。地震解释，断层分析和模拟模拟实验表明，白云凹陷裂陷后活动在32 Ma（T70）和13.8 Ma（T30）之间，主要受重力作用指向白云凹陷主陷，导致该断层广泛分布。面对主白云下陷，背面受压。大约在32 Ma（T70）时，大陆边缘的破裂和南中国海的扩散产生了对白云凹陷的弱压缩作用。纵裂后阶段的重力可能是由于凹陷区域中心和机翼区域之间的沉降和沉降不均引起的。沉积速率与断层生长指数之间的正相关关系支持了这一点。 13.8 Ma（T30）以后，断层活动与沉积速率呈负相关。地震剖面上的压缩隆升和侵蚀以及负构造沉降速率表明，东部菲律宾菲尼斯板块的俯冲压缩作用可能控制了从13.8 Ma（T30）到5.5 Ma（T10）的断层活动。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|76-87|共12页
  • 作者

    Zhen Sun; Ziying Xu; Longtao Sun; Xiong Pang; Chengzhi Yan; Yuanping Li; Zhongxian Zhao; Zhangwen Wang; Cuimei Zhang;

  • 作者单位

    CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    Guangzhou Marine Geological Survey, Guangzhou 510760, China;

    CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    Department of Science and Technology, Shenzhen Branch of CNOOC, Guangzhou 510420, China;

    Department of Science and Technology, Shenzhen Branch of CNOOC, Guangzhou 510420, China;

    Department of Science and Technology, Shenzhen Branch of CNOOC, Guangzhou 510420, China;

    CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    Shandong Geological Prospecting Institute of China Chemical Geology and Mine Bureau, Jinan Shandong 250013, China;

    CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Slope area; Post-rift fault activities; Gravity; Analogue modeling;

    机译：斜坡面积;裂谷后的断层活动;重力;模拟建模;

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