冀中坳陷留楚地区东二、三段油气输导通道及其控藏作用

发布时间：2018-03-21 06:31

本文选题：留楚地区　切入点：输导通道　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：为了研究冀中坳陷留楚地区东二、三段油气输导通道及其控藏作用,在几何学研究的基础上,运用断裂生长指数法结合断裂穿层性分析法、构造平衡剖面法厘定断裂的活动期次,分析断裂的形成演化史,对断裂系统进行划分,结合油气成藏关键时期,厘定油源断裂。依据断面埋深等值线法与三维地质建模方法相结合的方法识别油源断裂优势输导通道,结合烃源岩供烃能力分析,对油源断裂优势输导通道进行级别划分。通过统计不同构造断接厚度与各层油气分布关系、含油气层位与各层平均砂地比之间关系,确定泥岩盖层断接厚度下限与侧向分流平均砂地比下限,从而确定油气侧向分流层位。运用充注点刻画的方法,确定各层油气充注部位。通过油源断裂侧向充注点,不同区域构造脊及河道砂体的展布3个因素相结合的方法,刻画各层油气侧向运移路径。根据试油、测井、录井数据及典型油藏的精细解剖,分析各构造单元油气藏类型及油水分布特征,综合上面研究,确定油气输导通道对油气成藏与分布的控制作用。在研究过程中主要取得了以下几方面认识:(1)根据对留楚地区断裂垂向优势输导通道能力特征的研究,将油源断裂断面脊划分为3类:沟通高效烃源岩的断面脊(I类)、沟通有效烃源岩的断面脊(II类)和沟通低效-无效烃源岩的断面脊(III类)。(2)留楚地区东一、二段泥岩盖层断接厚度下限为272m,油气侧向分流的平均砂地比下限为0.2,其大部分地区为泥岩盖层封闭油气区,只在中部及南部部分地区油气能上调运移至东一段、馆陶组中。东二、三段各个层段砂地比值高于侧向分流界限,是油气主要的分流运移层位。(3)留楚地区油气输导通道对油气成藏与分布的控制作用主要有三点:油源断裂优势输导通道位置、个数控制供烃部位和数量;侧向分流层位控制油气运聚层位;侧向运移路径控制油气运聚分布区。
[Abstract]:In order to study the oil and gas migration channels and their reservoir control in the second and third sections of the East second and third member of Liuchu area in the Jizhong Depression, the fracture growth index method combined with the fracture transgressive analysis method is used on the basis of geometric study. The tectonic equilibrium section method determines the active stages of faults, analyzes the evolution history of the faults, divides the fault system, and combines the key period of hydrocarbon accumulation. Oil source faults are determined. The dominant channel of oil source faults is identified according to the combination of section depth isoline method and 3D geological modeling method, and the hydrocarbon supplying ability of source rock is analyzed. The dominant channel of oil-source fault is classified. The relationship between oil and gas distribution and the relationship between oil-bearing gas layer and the average sand to ground ratio of each layer are analyzed by statistical analysis of different structural fracture thickness and distribution of oil and gas. The lower limit of fault thickness of mudstone caprock and the lower limit of average sand to ground ratio of lateral distributary are determined to determine the position of lateral distribution of oil and gas. By using the method of injection point description, the location of oil and gas filling in each layer is determined, and the lateral filling point of oil source fault is obtained. The lateral migration paths of oil and gas in different zones are described by combining the three factors of distribution of structural ridges and channel sandbodies in different regions. According to the oil testing, well logging, logging data and fine anatomy of typical reservoirs, the oil and gas lateral migration paths of each layer are described. The oil and gas reservoir types and oil-water distribution characteristics of each structural unit are analyzed. In the course of the study, the following several aspects have been obtained: 1) based on the study of the characteristics of vertical dominant migration channels of faults in Liuchu area, the control effect of oil and gas migration channels on the formation and distribution of oil and gas reservoirs has been determined. The fault section ridges of oil-source faults are divided into three types: the cross-section ridges of high-efficiency source rocks, the cross-section ridges of effective source rocks, and the cross-section ridges of low-efficient and ineffective source rocks, which are classified into three types: type I of cross-section ridges communicating high-efficiency source rocks, type II of cross-section ridges of effective source rocks, and type III ridges of low-efficient and ineffective source rocks. The lower limit of fault thickness of mudstone caprock is 272 m, and the lower limit of average sand to ground ratio of lateral distribution of oil and gas is 0.2. Most of the area is mudstone capping oil and gas area, only in the central and southern parts of the area oil and gas can be transferred up to the eastern section. In Guantao formation, the ratio of sand to soil in each formation of the second and third formations of Guantao formation is higher than that of the lateral distributary boundary. There are three main controlling effects of oil and gas migration channel on hydrocarbon accumulation and distribution in Liuchu area: the location of dominant migration channel of oil source fault, the number of hydrocarbon supplying position and quantity; The lateral distributary layer controls the oil and gas migration and accumulation horizon, and the lateral migration path controls the hydrocarbon migration and accumulation distribution area.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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