摘要
断裂网络体系是含油气盆地的重要组成部分,这些复杂的断裂网络体系往往是由大量多级序断裂相互作用而成,难以通过几何学描述精确表达。因此,本文通过拓扑结构来表征含油气盆地中的多级序断裂网络,实现不同断裂间对比。在对拓扑参数,节点(独立I节点或连接的Y或X节点)和分支(I-I、I-C、C-C分支)统计的基础上,结合济阳坳陷不同应力背景下形成的多级序断裂网络与构造物理模拟实验进行对比,分析拓扑结构随应力变化的差异性。研究发现:1)单一拉伸背景下的相互作用仅限于断层侧接、叠覆时发生的连接(I节点和I-I或I-C控制),断裂网络相对单一,连通性较差;而在多期拉伸背景下,拓扑特征逐渐以Y节点和C-C分支为主,断裂间连接程度随外界应力的改变而变化,断裂网络更加复杂,连通性较好;2)断裂网络的连通性受到C-C分支影响,C-C分支比例大则断裂相对复杂,连通性更好,C-C分支比例小则断裂网络相对简单,连通性较差。因此,明确断裂网络体系的拓扑结构有助于区分含油气盆地中单相和多相拉伸作用,从而对沉积盆地的地球动力学背景提供约束。
The petroliferous basins are composed of complex fault networks,especially those formed by multi‐phase extension,which are often formed by the interaction of a large number of non‐collinear faults.These fault networks are difficult to accurately express through geometric description.Therefore,this article uses the topological characteristics to describe the fault network characterizes in the petroliferous basin.In this paper,the statistics of topological parameters‐nodes(independent I nodes or connected Y or X nodes)and branches(I‐I,I‐C,C‐C branches),combined with the multi‐order fault network formed under different stress backgrounds in the Jiyang Depression and experiments(analog)models,we analyze the difference of topological characteristics with different stress.We found that:1)the interaction effect under a single extension background is limited to the fault lateral connection and overlap(I node and I‐I or I‐C branches control);while in the multi‐stage extension background,the deformation characteristics gradually change to Y node and C‐C branch intersection are dominant,and the connection degree changes with regional stress.2)The complexity of the fault network is affected by the C‐C branch.If the ratio of C‐C branch is large,the fault network is relatively complicated,and if the ratio of C‐C branch is small,the fault network is relatively simple.Therefore,the topological structure of the fault network helps to distinguish between single‐phase and multi‐phase extension,thereby providing constraints on the geodynamic background of sedimentary basins.
作者
王迪
吴智平
杨林龙
王喜冬
Wang Di;Wu Zhiping;Yang Linlong;Wang Xidong(School of Geology and Mining Engineering,Xinjiang University,Urumqi 830046;School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580;Qingdao National Laboratory for Marine Science and Technology,China University of Petroleum,Qingdao,Shandong 266580;Shengli Oil field Company,SINOPEC,Dongying,Shandong 257015)
出处
《地质科学》
CAS
CSCD
北大核心
2023年第4期1226-1241,共16页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金面上项目(编号:42072169)
新疆维吾尔自治区自然科学基金资助项目(编号:2022D01C659)
新疆维吾尔自治区“天池英才”引进计划项目资助。
关键词
多级序断裂网络体系
拓扑特征
物理模拟
断裂连通性
济阳坳陷
Multi‐order fault network system
Topological characteristics
Analogue modelling
Fault connectivity
Jiyang Depression
