鄂尔多斯盆地白狼城油区长2~2油藏地质特征及剩余油浅析

发布时间：2018-05-02 14:40

本文选题：白狼城油区 + 长2~2油层组　；参考：《西北大学》2015年硕士论文

【摘要】：白狼城油区位于鄂尔多斯盆地二级构造单元陕北斜坡东北部,其主要产油层为长2油层组,该油区目前已全面进入注水开发阶段。针对产量低、含水高、油层动用程度低、注采井网不完善等问题,论文依据大量地质、测井、分析测试及油田开发动态资料,对研究区内主力产层长2段地层特征、沉积特征及砂体展布规律、储层特征及储层非均质性、油藏地质特征进行了研究,分析了区域内剩余油的分布特征,并针对本区剩余油分布特征以及油田实际开发状况,提出了开发调整措施的建议。取得的主要认识成果有：1研究区构造由东至西逐渐降低,且相对平缓,在南部的167井与1井之间有一条北东南西向正断层。2通过岩性特征、区域地层划分标志层等资料将研究区长2段划分为3个小层,又将主力产层长22段细分为5个小层。3研究区长2沉积相主要为三角洲平原亚相,微相为分支河流及分流间洼地。借助铸体薄片、扫描电镜及高压压汞实验等分析,长22砂岩储集层为中孔-细喉型、低渗透性储层。储层砂体连续性相对较好,砂体有效厚度相对大的地方主要沿河道发育区域呈条带状分布。白狼城油区储层总体属于弱非均质性—均质。4研究区油藏类型为岩性—构造油藏,油层分布受岩性、物性及低幅度构造控制,岩性遮挡和鼻状构造的共同控制作用形成了有效圈闭,构造高部位砂体有效厚度较大,含油饱和度较高。5研究区平面上剩余油主要集中于油田的中部与北部区域,纵向上剩余油主要富集于油层上部。对于不同类型剩余油提出了新井部署、注采调整等建议措施。
[Abstract]:The Bailangcheng oil area is located in the northeast of North Shaanxi slope, a secondary structural unit in the Ordos Basin. Its main oil producing layer is Chang 2 oil formation, which has entered the stage of water injection development. Aiming at the problems of low production, high water cut, low production degree of reservoir, imperfect injection-production well pattern and so on, according to a large number of geological, logging, analysis of testing and oilfield development dynamic data, the paper analyzes the formation characteristics of the main production layer Chang 2 in the study area. The sedimentary characteristics and distribution of sand bodies, reservoir characteristics, reservoir heterogeneity and reservoir geological characteristics are studied, the distribution characteristics of remaining oil in the area are analyzed, and the distribution characteristics of remaining oil in this area and the actual development situation of oil fields are analyzed. Suggestions for development adjustment measures are put forward. The main results obtained are as follows: the structure of the study area of 1: 1 gradually decreased from east to west and was relatively smooth. Between well 167 in the south and well 1, there was a NSE normal fault .2 passing through lithologic characteristics. According to the data of regional stratigraphic division, Chang2 is divided into 3 sublayers, and Chang22 is subdivided into 5 sublayers. 3. The sedimentary facies of Chang2 is mainly delta plain subfacies, and microfacies are branching rivers and interdistributary depressions. With the aid of casting thin sheet, scanning electron microscope and high pressure mercury injection experiment, the Chang 22 sandstone reservoir is of mesoporous and fine throat type with low permeability. The continuity of reservoir sand body is relatively good, and where the effective thickness of sand body is relatively large, the developed areas along the river channel are mainly distributed in strip shape. The reservoir in Bailangcheng oil area belongs to weakly heterogeneous-homogeneous area. The reservoir type is lithology-structural reservoir, and the reservoir distribution is controlled by lithology, physical property and low-amplitude structure, and the distribution of reservoir is controlled by lithology, physical property and low-amplitude structure. The joint control of lithologic occlusion and nose structure formed an effective trap. The effective thickness of sand body in the high part of the structure was large, and the remaining oil in the plane of the study area of higher oil saturation was mainly concentrated in the central and northern regions of the oil field. The remaining oil is mainly concentrated in the upper part of the reservoir. New well arrangement and injection-production adjustment are proposed for different types of remaining oil.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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