南海琼东南盆地的构造分段:模拟模型的启示及对油气勘探的影响

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
AAPG Bulletin Pub Date : 2024-05-01 DOI:10.1306/01162422069
Gengxiong Yang, Hongwei Yin, Jun Gan, Wei Wang, Jitian Zhu, Dong Jia, Xiaofeng Xiong, Wenqiao Xu
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引用次数: 0

摘要

位于中国南海北缘的琼东南盆地从西区到东区在走向、变形方式和构造复杂性方面呈现出明显的横向变化。人们普遍认为,西区经历了正交拉伸,而东区则在方位改变的原有构造控制下经历了斜向拉伸。此外,薄弱的下地壳也可能影响琼东南盆地的构造分段。本研究考虑了与地壳强度有关的因素,如脆-粘厚度比和延伸速度,利用物理模拟模型探讨了西区和东区之间的构造分段。结果表明,在上覆结构的分段中,对原有速度不连续性(VD)的控制与这两个因素密切相关。在下地壳较薄或快速延伸的情况下,变形主要集中在 VD 沿线,显示出正交带和斜交带之间的明显分段。相反,在下地壳较厚较弱或速度较慢的情况下,裂谷盆地的离散发育因受原有VD的控制而减弱,分段不明显。下地壳较薄、拉伸速度较快的模型成功地解释了琼东南盆地的分段特征。基于实验结果,我们解释了东西两区构造演化的差异及其对琼东南盆地构造成藏的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural segmentation in the Qiongdongnan Basin, South China Sea: Insights from analogue models and implications for hydrocarbon exploration
The Qiongdongnan Basin at the northern margin of the South China Sea shows distinct lateral variations in trends, deformational styles, and structural complexities from the western to the eastern zones. It is widely accepted that the western zone undergoes orthogonal stretching, whereas the eastern zone undergoes oblique stretching under the control of preexisting structures with changed orientation. In addition, the weak lower crust may affect the structural segmentation of the Qiongdongnan Basin. This study considers factors related to crustal strength, such as brittle-to-viscous thickness ratios and extensional velocities to explore the structural segmentation between the western and eastern zones using physical analogue modeling. The results show that the control of preexisting velocity discontinuity (VD) in the segmentation of the overlying structure is strongly associated with these two factors. In the case of a thinner lower crust or fast extension, deformation was concentrated along the VD, showing an apparent segmentation between the orthogonal and oblique zones. Conversely, when there was a thicker weak lower crust or slow velocity, the rift basin discrete development due to the control of preexisting VD weakened, and the segmentation was indistinct. A model with a thinner lower crust and faster stretching velocity successfully accounted for the observed segmentation characteristics of the Qiongdongnan Basin. Based on the experimental results, we explain the differential tectonic evolution between the eastern and western zones and their impact on the structurally formed reservoirs in the Qiongdongnan Basin.
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来源期刊
AAPG Bulletin
AAPG Bulletin 工程技术-地球科学综合
CiteScore
6.60
自引率
11.40%
发文量
73
审稿时长
4.8 months
期刊介绍: While the 21st-century AAPG Bulletin has undergone some changes since 1917, enlarging to 8 ½ x 11” size to incorporate more material and being published digitally as well as in print, it continues to adhere to the primary purpose of the organization, which is to advance the science of geology especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources. Delivered digitally or in print monthly to each AAPG Member as a part of membership dues, the AAPG Bulletin is one of the most respected, peer-reviewed technical journals in existence, with recent issues containing papers focused on such topics as the Middle East, channel detection, China, permeability, subseismic fault prediction, the U.S., and Africa.
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