文明寨油田明1、明15、明16块沙二下、沙三上亚段储层非均质性研究

发布时间：2018-06-25 18:15

本文选题：文明寨油田 + 沙河街组　；参考：《长江大学》2015年硕士论文

【摘要】：文明寨油田位于山东省聊城市莘县与河南省濮阳市清丰县交汇处,含油面积8.7kmm2,石油地质储量2234.47×104t,含油层位为古近系沙河街组沙一段至沙四段,油藏埋深1360-2320米,含油井段平均长达960米。该油田是典型的极复杂断块油气田,通过30余年的开发,总体水驱开发效果较好,但随着油田开发程度的提高,该区油藏出现诸多问题,例如沉积体系复杂,储层变化快、储层非均质性严重,剩余油呈高度分散状态,认识难度大等。为了解决该区面临的问题,进一步改善开发效果,本论文在沉积微相研究的基础上,对储层砂体的特征及其展布做了深入的分析和刻画,为后期寻找剩余油提供了可靠的地质依据。本文以沉积学、储层地质学、测井地质学为理论基础,综合利用精细油藏描述技术,采用多因素综合分析的研究方法,利用钻井、录井数据、测井资料等,通过分析扫描电镜图片、铸体薄片、岩心化验数据等对研究区储集层的岩石学特征、物性特征及非均质性特征进行深入研究,总结出研究区储层非均质性特征在横向上和纵向上的分布规律,识别出了隔夹层且重点分析了隔夹层的展布特征；对研究区储层非均质性的主要影响因素进行了全面的分析研究,从而为提高油田最终采收率和改善开发效果奠定了地质基础。根据岩心观察、铸体薄片鉴定、扫描电镜图片分析,可知沙二下、沙三上亚段储层内主要砂岩类型以长石砂岩、岩屑长石砂岩为主,含少量长石石英砂岩。沙二下亚段储层平均孔隙度为26.81%,平均渗透率为662.07mD；沙三上亚段平均孔隙度25.61%,平均渗透率396.25mD,整体上表现为中高孔、中高渗储层。受三角洲前缘末端沉积微相控制,研究区沙二下、沙三上亚段储层非均质性较强,尤其是层内非均质性和平面非均质性尤为严重。粒度、渗透率在垂相上均主要表现为复合韵律,孔隙度和渗透率在平面上的非均质性强,渗透率变异系数在1以上。储层中夹层非常发育,厚度一般较大,分布范围广,主要发育有灰质夹层和泥质夹层两大类。有效储层主要分布在水下分流河道中,前缘席状砂次之,但有效厚度系数明显要小。经过深入分析研究区储层的非均质性的影响因素,认为该区储层的非均质性受多种因素影响,其中最为重要的是沉积特征、成岩作用和构造作用以及后期的注水开发等因素对储层砂体横向上和纵向上的控制,通过对储层宏观和微观结构的改变,使该区的储层非均质性趋于严重。
[Abstract]:The Wenzhai Oilfield is located at the junction of Qingfeng County, Liaocheng County, Shandong Province, and Qingfeng County, Puyang City, Henan Province, with an oil-bearing area of 8.7 km2 and a petroleum geological reserve of 2234.47 脳 10 ~ 4t. The oil-bearing horizon is from the first to the fourth member of Shahejie formation of the Paleogene system, with a buried depth of 1360-2320 meters. The oil well contains an average length of 960 meters. The oilfield is a typical oil and gas field with very complex fault block. After more than 30 years of development, the overall effect of water drive development is good. However, with the improvement of oilfield development degree, there are many problems in the reservoir in this area, such as complex sedimentary system and rapid reservoir change. The reservoir heterogeneity is serious, the remaining oil is highly dispersed and difficult to understand. In order to solve the problems in this area and further improve the development effect, based on the study of sedimentary microfacies, the characteristics and distribution of reservoir sand bodies are deeply analyzed and characterized in this paper. It provides a reliable geological basis for looking for remaining oil in the later period. Based on the theory of sedimentology, reservoir geology and logging geology, this paper makes comprehensive use of fine reservoir description technology, adopts the research method of multi-factor comprehensive analysis, and makes use of drilling, logging data, etc. The petrological characteristics, physical properties and heterogeneity of the reservoir in the study area were studied by analyzing the SEM pictures, the thin sections of the cast body and the core test data. The distribution of reservoir heterogeneity in the study area is summarized, and the distribution of the interlayer is identified and the distribution of the interlayer is analyzed. The main influencing factors of reservoir heterogeneity in the study area are comprehensively analyzed and studied, thus laying a geological foundation for improving the final oil recovery and improving the development effect. According to core observation, thin section identification of cast body and SEM picture analysis, it can be seen that the main sandstone types in the reservoir of the upper submember of Sha 2, Sha 3 are feldspathic sandstone, lithic feldspathic sandstone, and a small amount of feldspar quartz sandstone. The average porosity of the reservoir in the lower part of the second formation is 26.81 with an average permeability of 662.07mD, and the average porosity of the upper member of the third member is 25.61, with an average permeability of 396.25mD. the reservoir is characterized by medium high porosity and medium high permeability as a whole. Controlled by the sedimentary microfacies at the end of the delta front, the reservoir heterogeneity of the upper submember of Sha 3 is strong, especially the heterogeneity within the layer and the plane heterogeneity. The grain size and permeability are mainly characterized by compound rhythm in vertical phase. The porosity and permeability are strong in the plane and the coefficient of variation of permeability is above 1. The intercalation in the reservoir is very developed, the thickness is generally large, and the distribution range is wide. There are two main types of intercalation: grey intercalation and muddy intercalation. The effective reservoir is mainly distributed in the underwater distributary channel, followed by the front matting sand, but the effective thickness coefficient is obviously small. Through in-depth analysis of the factors affecting the heterogeneity of reservoirs in the study area, it is considered that the heterogeneity of reservoirs in this area is affected by many factors, the most important of which is the sedimentary characteristics. Factors such as diagenesis and tectonism and later water injection development control the reservoir sand body laterally and longitudinally. By changing the macro and micro structure of the reservoir, the reservoir heterogeneity in this area tends to be serious.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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