摘要
裂陷盆地形成过程受多因素制约,如基底先存构造、沉积物质能干性、裂陷期次与裂陷方向,最终会形成多组走向不同,规模各异的断裂系统,组成多种构造样式。这无疑使盆地构造解析变得极为困难,本文通过三维地震资料解释与对照组构造物理模拟实验,重现多因素影响下东营组以来南堡凹陷南北向伸展形成演化过程。研究表明:①南堡凹陷是发育在先存构造基底条件下的多期裂陷产物。最终在明化镇组形成南北分区变形,东西分段相连,上下分层变形的构造格局。②凹陷南部的先存古隆起影响均匀分布的伸展变形,北部形成分段相连的网状交织式新生断裂系统,南部先存构造再活化形成东西两侧弧形雁列式继承断裂系统。多期异向裂陷过程中形成的北东向先存断层面是制约晚期断层定向排列的重要因素。③韧性滑脱层是增强断层相互作用的关键物质因素,促进了孤立断层彼此连接,形成东西向分段连接的正断层组合,断层通过自身的弯曲容纳由先存构造导致的斜向伸展位移。
The formation process of rift basins is influenced by multiple factors,including pre-existing structures,sedimentary material properties,rift phases,and directions.Ultimately,this process results in multiple sets of fault systems with different orientations and scales,leading to the formation of various structural styles.This undoubtedly makes the structural analysis of basins highly challenging.In this study,we replicated the evolution process of the Nanpu sag since the Dongying Formation,which underwent N-S extension under the influence of multiple factors,through the interpretation of 3D seismic data and comparison with analogue modellings of group structures.The study reveals the following findings:The Nanpu sag is a result of multiple-phase rifting developed under pre-existing structures.Eventually,it formed a structural pattern of N-S partition deformation,connected in segments from east to west,and vertically deformed within the Minghuazhen Formation.The pre-existing paleo-uplift in the southern part of the sag affects the uniformly distributed extensional deformation,while in the northern part,a segmented interconnected mesh-like fault system is formed.Reactivation of pre-existing structures in the southern part leads to the formation of E-W curved en echelon inherited fault systems on both sides.The NE pre-existing fault planes formed during multiple-phase orthogonal rifting processes are important factors restricting the late-stage oriented arrangement of faults.Ductile detachment layers are key material factors that enhance the interaction between faults.They facilitate the connection of isolated faults,forming E-W segmented connected normal fault combinations.The faults accommodate oblique extension caused by pre-existing structures through their own bending.
作者
王于恒
于福生
宋璐
王丹丹
赵宝银
齐伊梨
孟令箭
WANG Yuheng;YU Fusheng;SONG Lu;WANG Dandan;ZHAO Baoyin;QI Yili;MENG Lingjian(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;China National Petroleum Corporation Engineering Technology R&D Company Limited,Beijing 102206,China;The Fifth Geology Company of Hebei Geology&Minerals Bureau,Tangshan,Hebei 063000,China;Jidong Oilfield Company,PetroChina Limited Company,Tangshan,Hebei 063004,China)
出处
《地质学报》
北大核心
2025年第8期2597-2620,共24页
Acta Geologica Sinica
基金
国家自然科学基金面上项目(编号41472116)
中国石油天然气股份有限公司冀东油田分公司勘探开发研究院项目(编号JDYT-2017-JS-308)联合资助的成果。
