靖边油田郑石湾区延长组长2储层综合评价

发布时间：2018-03-21 20:42

  本文选题：储层评价　切入点：三角洲平原　出处：《西北大学》2017年硕士论文　论文类型：学位论文

【摘要】：储层评价是油藏描述的重要内容,研究工作贯穿于整个油田勘探开发过程,对保障油田高效科学开发具有重要的指导意义。其研究内容涵盖宏观层面的沉积微相、砂体非均质性以及微观层面的孔隙结构、物性差异、渗流特征等。靖边油田郑石湾区位于鄂尔多斯盆地陕北斜坡中南部,目前该区长2油层组区域注水存在有水窜现象导致部分油井含水偏高,影响注水开发效果。通过对研究区长2储层的综合评价,搞清储层砂体展布规律和宏观、微观非均质性等,圈定储层有利区分布,进而为井网布置、开发注水方案的实施等提供储层地质方面的依据。本文运用沉积学、石油地质学和储层地质学的相关理论知识,采用钻井测井资料分析、岩心观察描述以及多种储层实验测试手段相结合的方法,对郑石湾区延长组长2油层组进行了精细地层划分与对比,储层沉积微相类型识别及平面分布刻画,并分析了储层成岩作用和物性特征,结合储层宏观与微观特征,进行了储层综合分类评价。根据旋回对比和标志层识别等原则,将郑石湾区长2油层组划分为3个砂层组,其中主要储油层长21可进一步划分为3个小层。岩心观察和测井相分析认为,研究区长2油层组主要发育三角洲平原亚相,包括分流河道、分流间湾等沉积微相;物源供给方向来自研究区东北部。单砂体刻画结果显示顺河道方向砂体连通性好,垂直河道方向连通性较差;长2储层岩石以灰白色、灰绿色中-细粒长石砂岩为主;经历了多种成岩作用,其中对储层物性有利的建设性成岩作用包括溶蚀、交代作用;破坏性成岩作用为机械及化学压实作用、胶结作用;成岩阶段为中成岩阶段A期;大量岩心样品物性实验测试表明,研究区长2油层组主要为中孔隙度、低渗透率储层;润湿性及敏感性分析显示长2为亲水型,无～较弱速敏、较弱盐敏、中等～偏强水敏、弱～较强碱敏、弱酸敏;对主要储油层段长21砂层组各小层非均质性研究表明,长211小层及长213小层的层间非均质性较强,平面非均质性较弱;长212小层层间非均质性较弱,但平面非均质性相对较强;选取沉积微相特征、储层物性特征以及非均质性相关表征参数,采用聚类分析方法,对长21砂层组各小层进行了综合评价,划分出好、中等、差三类储层。通过与研究区已有生产井初期产量的对比,检验了储层评价与预测结果。研究区长21砂层组有利区的分布主要受沉积微相展布控制,后期成岩作用对物性和非均质性影响明显。
[Abstract]:Reservoir evaluation is an important part of reservoir description. The research work runs through the whole process of oil field exploration and development, and has important guiding significance to ensure the high efficiency and scientific development of oil field. Sand body heterogeneity, pore structure, physical property difference, percolation characteristics, etc. The Zhengshiwan area of Jingbian Oilfield is located in the central and southern part of northern Shaanxi slope in Ordos Basin. At present, the phenomenon of water channeling in the area of Chang 2 oil formation in this area leads to the high water cut of some oil wells, which affects the water injection development effect. Through the comprehensive evaluation of Chang 2 reservoir in the study area, the distribution law and macroscopic distribution of reservoir sand body are made clear. Microscopic heterogeneity and so on, delineate the distribution of favorable reservoir areas, and then provide the basis of reservoir geology for well pattern arrangement and the implementation of water injection development. This paper applies the relevant theoretical knowledge of sedimentology, petroleum geology and reservoir geology. By means of drilling log data analysis, core observation and description, and various reservoir test methods, fine formation division and correlation of Yanchang No. 2 formation in Zhengshiwan area were carried out. Reservoir sedimentary microfacies type identification and plane distribution characterization, and analysis of diagenesis and physical characteristics of reservoir, combined with macro and micro reservoir characteristics, comprehensive reservoir classification and evaluation, according to the cyclic correlation and marker layer recognition principles, Chang2 reservoir formation in Zhengshiwan area can be divided into 3 sand formations, in which Chang21 reservoir can be further divided into three sub-layers. Core observation and logging facies analysis show that the Chang 2 reservoir group in the study area mainly developed delta plain subfacies. Including distributary channel, distributary bay and other sedimentary microfacies, the source supply direction comes from the northeast of the study area. The single sand body depicts that the channel direction sand body connectivity is good, the vertical channel direction direction connectivity is poor, the Chang 2 reservoir rock is grayish white, The gray-green meso-fine feldspathic sandstone has undergone many diagenesis, among which constructive diagenesis, which is favorable to reservoir physical properties, includes dissolution and metasomatism, destructive diagenesis is mechanical and chemical compaction, cementation; The physical properties of a large number of core samples show that the Chang 2 reservoir is mainly medium porosity and low permeability reservoir, and the wettability and sensitivity analysis shows that Chang 2 is hydrophilic and has no weak velocity sensitivity. The results show that the heterogeneity of Chang 211 and 213 layers is stronger and the plane heterogeneity is weak. The heterogeneity between the layers of Chang 212 is weak, but the plane heterogeneity is relatively strong, the sedimentary microfacies, reservoir physical properties and the parameters related to heterogeneity are selected, and the cluster analysis method is used. The comprehensive evaluation of each sub-layer of Chang 21 sand formation has been carried out, and three types of reservoirs have been divided into good, medium and poor reservoirs. The initial production rate of production wells has been compared with that of existing production wells in the study area. The results of reservoir evaluation and prediction are verified. The distribution of favorable area of Chang 21 sand formation in the study area is mainly controlled by sedimentary microfacies distribution and diagenesis has obvious influence on physical properties and heterogeneity.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
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本文编号：1645462