塔里木盆地麦盖提斜坡罗西断裂发育特征、演化及形成机制  

Development Characteristics,Evolution and Formation Mechanism of Luoxi Fault in Maigaiti Slope,Tarim Basin

作　　者：耿锋 易泽军[3,4] 郝建龙 沙旭光[2] 王海学[3,4] 冯昌[3] 段宏亮 Geng Feng;Yi Zejun;Hao Jianlong;Sha Xuguang;Wang Haixue;Feng Chang;Duan Hongliang(School of Geoscience and Surveying and Mapping Engineering,China University of Mining and Technology,Beijing 100083,China;SINOPEC Northwest Oilfield Company Exploration and Development Research Institute,Urumqi 830011,China;CNPC Fault Controlling Reservoir Research Laboratory,Northeast Petroleum University,Daqing 163318,China;Key Laboratory of Oil&Gas Reservoir and Underground Gas Storage Integrity Evaluation of Heilongjiang Province,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]中国矿业大学地球科学与测绘工程学院,北京100083 [2]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [3]东北石油大学CNPC断裂控藏研究室,黑龙江大庆163318 [4]东北石油大学油气藏及地下储库完整性评价黑龙江省重点实验室,黑龙江大庆163318

出　　处：《地球科学》2023年第6期2087-2103,共17页Earth Science

基　　金：国家自然科学基金项目(No.41972157);中国石油化工股份有限公司西北油田分公司“玉北中西部-巴楚东段奥陶系规模储层测试分析”项目(No.34400008-21ZC0613-0016).

摘　　要：塔里木盆地玉北地区发育一系列北东向断裂并获油气发现,断裂带内不同段的构造样式存在显著差异.以罗西断裂为例,结合断层分段特征与活动期次研究,应用砂箱物理模拟和应变分析技术,探讨罗西断裂的演化与形成机制.结果表明:罗西断裂是一个典型的逆冲-走滑复合构造,平面具有“三段式”生长特征,整体表现为隆起特征,局部出现“下凹”现象.基于不整合特征、深度-幅度曲线以及年代地层格架,认为罗西断裂主要经历三期变形:(1)加里东中期Ⅲ幕是罗西断裂雏形的形成时期,逆冲断裂开始微弱抬升;(2)加里东晚期是罗西断裂的主要活动时期,活动强度比加里东中期Ⅲ幕强烈;(3)海西早期是罗西断裂走滑改造的主要时期.砂箱物理模拟实验证实,“三期两向”叠加变形控制着罗西断裂的演化与形成机制,加里东中期Ⅲ幕和加里东晚期控制以斜向逆冲为主的隆起带的形成,海西早期张扭改造控制“下凹”的形成演化.应变分析指示逆冲-走滑复合构造有利储层部位主要集中在边界断层、与边界断层小角度斜交的走滑断层和断层交汇区域,这对塔里木盆地碳酸盐岩逆冲-走滑断裂控储与规模储层勘探有重要意义.A series of NE-trending faults have been developed in the Yubei area of the Tarim basin and oil and gas were discovered.The structural styles of different segments of the fault zone are significantly different.In this paper,the Luoxi fault is taken as an example,the evolution and formation mechanism of the Luoxi thrust-strike-slip composite structure are discussed by means of sand box physical simulation and strain analysis,combined with the study of fault segmentation and active stages.The results show that Luoxi fault is a typical thrus-strike-slip composite strcture,and the plane of the Luoxi fault has a“three-segment”growth pattern,with uplift as a whole and sag as a local phenomenon.Based on the unconformity characteristics,depth-amplitude curves and chronostratigraphic framework,it is considered that the Luoxi fault experienced three stages of deformation:(1)the Middle Caledonian stage III was the formative period of the rudiment of the Luoxi fault,and the thrust fault begins to rise weakly;(2)the late Gariton Luoxi fault is the main active stage,and the active intensity is stronger than the stage III of Middle Caledonian;(3)the Early Hercynian period is the main period of strike slip reformation of Luoxi fault.The sandbox physical simulation experiment confirmed that the“three stages and two directions”superimposed deformation controlled the evolution and formation mechanism of the Luoxi fault,and the Middle Caledonian III episode and the Late Caledonian stage controlled the formation of the oblique thrust uplift belt,the formation and evolution of“sag”was controlled by the early transtensional deformation at the Early Hercynian period.Strain analysis indicates that the favorable reservoir positions of the thrust-strike-slip composite structure are mainly concentrated in the boundary fault,strike-slip fault with small angle oblique intersection with the boundary fault and the fault confluence area,this is of great significance to the exploration of Tarim basin carbonate reservoirs controlled by

关 键 词：断层分段性 断层活动期次 形成机制 物理模拟 罗西断裂 塔里木盆地 石油地质. 

分 类 号：P618[天文地球—矿床学]