涧峪岔油田长6油层组砂体特征与油气分布规律研究

发布时间：2018-01-02 08:08

本文关键词：涧峪岔油田长6油层组砂体特征与油气分布规律研究　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：涧峪岔油田位于鄂尔多斯盆地陕北斜坡中部。主要产油层位为长4+5、长6段。油田采用注水开发方式生产,近年来,油田含水上升速度加快,水驱效果变差,为了分析原因并调整注水开发方案,进行砂体结构特征及空间展布规律研究显得十分必要。本论文以沉积岩石学、测井地质学、层序地层学为指导,以测井相分析为手段,在区域地层对比的基础上,结合前人的研究成果,确定了研究区目的层位的沉积相类型为三角洲前缘沉积,并开展单井相和连井相研究,刻画沉积相平面分布特征。依据测井相特征,对砂体进行垂向结构、叠置类型、边界识别等进行研究。根据砂体发育特征,结合沉积微相背景和测井曲线的岩电响应规律,运用基准面旋回原理,对研究区目的层位的砂体进行成因分类。依据沉积相特征,结合砂地比、砂厚、油层厚度分布的统计,确定目的层砂体及有效砂体平面上的展布规律,进而通过油藏剖面分析油气分布规律,利用注采对比剖面分析砂体结构对注水开发效果的影响。研究表明,长61段的砂体主要为分流河道砂体及河口坝砂体,单砂体具有4种基本垂向结构类型,多层砂体发育多种叠加结构,砂体垂向接触关系有3种,砂体边界的识别主要利用测井曲线差异、砂体厚度差异、砂顶层位高程差异等。运用基准面旋回原理,将本区砂体成因类型分为3大类:分流河道成因、河口坝成因、分流河道与河口坝复合成因。在砂体划分和内部结构研究的基础上,研究了砂体结构对注水开发效果的影响,结果表明,产层砂体与注水砂体的砂体厚度连通比例越大,注水效果越好,多层叠置型砂体的注水效果较好。
[Abstract]:Jianyucha oil field is located in the middle of northern Shaanxi slope in Ordos basin. The main oil producing zone is Chang 45 and Chang 6. The oilfield uses water injection development method to produce the oil field. In recent years, the water cut in the oil field has increased rapidly. In order to analyze the causes and adjust the water injection development scheme, it is necessary to study the characteristics of sand body structure and spatial distribution. This paper focuses on sedimentary petrology and logging geology. Under the guidance of sequence stratigraphy and well logging facies analysis, on the basis of regional stratigraphic correlation and combined with previous research results, the sedimentary facies type of the target horizon in the study area is determined as delta front sedimentary. According to the characteristics of logging facies, the vertical structure of sand body, superposition type, boundary recognition and so on are studied, according to the characteristics of sand body development. Combined with the lithoelectric response law of sedimentary microfacies background and logging curve, the origin classification of the sand body of the target horizon in the study area is carried out by using the principle of base-level cycle. According to the characteristics of sedimentary facies, combined with the ratio of sand to soil, sand thickness is obtained. According to the statistics of reservoir thickness distribution, the distribution law of sand body and effective sand body in target layer is determined, and the distribution law of oil and gas is analyzed by reservoir profile. The effect of sand body structure on water injection development is analyzed by using injection-production contrast profile. The results show that the sand body of Chang 61 is mainly distributary channel sand body and estuarine bar sand body, and single sand body has four basic vertical structure types. There are many kinds of superposition structures developed in multi-layer sand bodies. There are three kinds of vertical contact relations between sand bodies. The recognition of sand body boundary mainly uses log curve difference, sand body thickness difference, sand top level height difference and so on. The principle of base-level cycle is used. The genetic types of sand bodies in this area are divided into three categories: distributary channel origin, estuarine dam origin, distributary channel and estuarine dam composite origin, on the basis of sand body division and internal structure research. The effect of sand body structure on water injection development is studied. The results show that the greater the proportion of sand thickness connectivity between producing sand body and water injection sand body, the better the water injection effect, and the better the water injection effect of multi-layer superimposed sand body.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

【相似文献】