巴基斯坦M区块白垩系断裂特征研究

发布时间：2018-03-09 03:06

本文选题：下印度河盆地　切入点：断裂特征　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以巴基斯坦下印度河盆地M区块最新采集的三维地震资料为基础,以研究区内白垩系断裂构造特征与断裂构造演化史为主要研究内容,运用构造地质学、石油地质学、沉积学等理论知识,详细论述了下印度河盆地M区块的区域构造背景、断裂的基本特征、构造演化阶段及断裂与有利含油气区带的关系,主要取得了以下成果认识。研究区内断裂发育,全部为正断层,可分为三个级别：二级控带,三级控圈,四级为微小断裂,纵向剖面上,断裂的组合样式有“Y”字形或反“Y”字形断层、阶梯状断层、地堑和地垒等；平面上分为平行式断裂、雁列式断裂和斜交式断裂。区域上多次大的构造运动直接导致了研究区垒堑相间的构造特征：研究区可分为4个构造带,从西向东分别为西部地堑带、西部地垒带、中部地堑带和东部地垒带。控制构造带边界的断层为二级断层,为研究区内最高级别断层。根据构造演化研究结果,研究区构造演化史主要可以分为四个阶段：侏罗纪早期至白垩纪早期的裂谷作用时期,形成少量正断裂；白垩纪中期至白垩纪晚期的走滑拉张时期,研究区大量正断裂在此时期形成；古新世的持续坳陷期：古近纪晚期的喜马拉雅造山时期。断裂与油气藏的形成与分布关系密切,研究区内有利含油气构造类型可分为三类,断裂控制的次级地垒,上升盘断鼻构造、断块均是油气运移富集的重点构造单元,具有良好的勘探前景。
[Abstract]:Based on the newly collected 3D seismic data of M block in Lower Indus Basin, Pakistan, and taking the Cretaceous fault structural characteristics and structural evolution history of the Cretaceous as the main research contents, this paper applies tectonic geology and petroleum geology. Based on the theory of sedimentology, this paper discusses in detail the regional tectonic background, the basic characteristics of faults, the stage of tectonic evolution and the relationship between faults and favorable oil-bearing zones in the Lower Indus Basin. The main achievements are as follows: the faults developed in the study area, all of which are normal faults, can be divided into three levels: secondary control zone, third-order control circle, four-level micro-fault, longitudinal profile, The combined patterns of the faults are "Y" or anti-" Y "faults, ladder faults, graben and horsts, etc. The faults are divided into parallel faults on the plane. The structural characteristics of the graben phase in the study area are as follows: the study area can be divided into four structural zones, from west to east, they are the western graben belt and the western Horst belt, respectively. The fault controlling the boundary of the tectonic belt is a second-order fault, which is the highest grade fault in the study area. The history of tectonic evolution in the study area can be divided into four stages: the rift period from the early Jurassic to the early Cretaceous, the strike-slip extension period from the middle Cretaceous to the late Cretaceous, the formation of a small amount of normal faults during the rift period from the early Jurassic to the early Cretaceous. In the study area, a large number of normal faults were formed in this period, and the continuous depression of Paleocene: the Himalayan orogenic period in the late Paleogene. The faults are closely related to the formation and distribution of oil and gas reservoirs, and the favorable types of oil-bearing structures in the study area can be classified into three types. The fault-controlled secondary barrier, uplift plate fault nose structure and fault block are all important structural units for oil and gas migration and enrichment, so they have a good prospect of exploration.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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