四川盆地中部走滑断裂发育过程及其数值模拟实验
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1.中国石油大学北京;2.中国石油杭州地质研究院

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P541

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国家自然科学基金项目(面上项目,重点项目,重大项目)


The development process and numerical simulation of strike-slip fault in central Sichuan Basin
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China University of Petroleum, Beijing

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    摘要:

    四川盆地是我国中部的一个大型复杂含油气沉积盆地,在盆地中部发育大量延伸远、规模大、断距小的走滑断裂。为研究该类型走滑断裂对油气成藏的控制作用,通过高精度地震资料解析、数值模拟方法系统性的研究了川中地区发育的走滑断裂系统。结果表明:川中地区一级走滑断裂主要划分为近东西走向、北东走向两个体系,一级走滑断裂往往沿着次级构造单元的边界发育;近东西走向的走滑断裂主体活动时间为二叠纪之前,即海西中期的,而北东走向的走滑断裂主体形成于海西晚期到印支期要晚于东西向断裂;川中地区的走滑断裂发育与多期构造叠加作用密切相关,二叠纪之前川中古隆起的定型形成了近东西走向走滑断裂。而海西晚期构造体制发生转换,至印支期龙门山前的前陆构造叠加改造,形成了北东走向的走滑断裂;德阳安岳裂陷槽对区域应力分布有明显的控制,东西向走滑断裂无法穿越裂陷边界继续生长。

    Abstract:

    The Sichuan Basin, situated in the heart of China, is renowned for its abundant oil and gas reserves within a geologically intricate sedimentary basin. A multitude of strike-slip faults, characterized by their extensive reach, substantial scale, and modest displacement, are particularly prominent in the basin's central region. In order to elucidate the influence of these faults on the formation of oil and gas reservoirs, high-precision seismic data analysis and numerical simulation techniques were used to investigate the strike-slip fault system in the central Sichuan area. The results show that the primary strike-slip faults in the central Sichuan region bifurcate into two distinct orientations: nearly east-west (EW) and northeast-southwest (NE). These first-order faults are inclined to emerge along the peripheries of secondary tectonic units. The near EW-oriented faults were predominantly active prior to the Permian era, coinciding with the Hercynian phase, whereas the NE-oriented faults were shaped later, during the transition from the Late Hercynian to the Indosinian period;The evolution of these strike-slip faults is intricately tied to a series of overlapping tectonic events. The culmination of the ancient uplift in central Sichuan predating the Permian era precipitated the genesis of the near EW-oriented faults. Subsequently, a pivotal tectonic regime shift during the Late Hercynian epoch, coupled with the subsequent Indosinian period's fore-arc structural modifications near the Longmen Mountains, catalyzed the emergence of the NE-oriented faults;Moreover, the Deyang Anyue fault trough is identified as a pivotal factor in dictating the regional stress distribution, effectively hindering the east-west faults from traversing beyond the fault trough boundary, thereby stifling their further development.

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江一鸣,陈石,李文正,等. 四川盆地中部走滑断裂发育过程及其数值模拟实验[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-16
  • 最后修改日期:2024-06-13
  • 录用日期:2024-06-24
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