新沟地区新下Ⅱ油组储层特征研究

发布时间：2018-05-14 01:14

本文选题：新下Ⅱ油组 + 湖相白云岩　；参考：《长江大学》2015年硕士论文

【摘要】：世界上一半的油气资源都储集在碳酸盐岩中,从而使得湖相碳酸盐岩研究在陆相含油气盆地中的地位日益受到重视,因此,开展湖相碳酸盐岩沉积、储层特征及有利储层分布预测研究对于指导油气勘探有重要的意义。本文在对前人相关研究成果详细调研的基础上,以碳酸盐岩沉积学、储层地质学及石油地质学、测井地质学、数理统计等基础理论为指导,充分利用钻井、岩心、测井、地震及有机和无机地球化学特征分析等资料,对潜江凹陷南部新购地区新下Ⅱ油组湖相白云岩的地层发育特征、储层特征、有利储层分布预测等一系列问题进行了系统的研究。通过对研究区岩石样品的镜下鉴定,结合X衍射分析,认为研究区主要发育泥晶白云岩、陆屑泥晶白云岩、泥晶泥质白云岩、白云质泥岩、泥膏岩、膏泥岩和粉砂岩等七种类型的岩性。通过对取心段岩心深度归位,分析统计不同类型岩性所对应的测井响应特征,考虑到测井识别岩性的准确度及对主要储层段进行识别的目的,将七类岩性合并为白云岩类、泥岩类、泥膏岩和粉砂岩四大类岩性,在此基础上应用Fisher判别分析法建立不同类别岩性的测井识别模型,明确了白云岩储层在全区的分布及变化规律。研究区新沟地区新下Ⅱ油组划分为浅湖沉积一类大相,并进一步把浅湖相化分为湖坪、浅湖砂坝和局限洼地三种亚相,其中湖坪可分为泥坪和云坪两个微相,局限洼地可划分为泥质洼地和云质洼地两种微相类型。其中云坪微相和云质洼地微相为研究区白云岩发育的主要微相类型：云坪微相主要发育于工区内地势相对较高的部位,其内部生储配置关系好,白云岩储层物性较好,有利于油气在内部的流动,为研究区有利储层发育的微相类型；云质洼地微相主要形成于地势低洼部位,内部生储配置关系差,白云岩单层厚度较大,物性差,内部非均质性较强,不利于油气在内部的流动,不能作为研究区有利储层发育的微相类型。根据沉积特征的综合分析,明确了研究区湖相碳酸盐岩的发育主要受物源、古地貌和湖平面升降三种因素的综合控制。储层特征研究表明：研究区新下Ⅱ油组碳酸盐岩储层为中孔-特低渗储层,碳酸盐岩储层储集性能由好至坏依次为陆屑泥晶白云岩泥晶白云岩泥晶泥质白云岩,沉积相是储层物性好坏的主要控制因素。次生孔隙中的晶间孔隙为研究区主要储集空间,原生微生物孔、特大孔隙、铸模孔和溶蚀缝为次要的储集空间,对储层物性的改善贡献不大。综合已发现的油层及油气显示情况、古地貌特征、沉积相分布特征、有效白云岩厚度、储层发育特征等,对研究区新下Ⅱ油组碳酸盐岩储层分布进行预测。由新一区和新二区所为围成的“C”字形区域内,处于构造相对高部位,为三套含油层段中有效白云岩储层叠合部位,为研究区有利储层分布区带；此外,由桥2井、新61井和西2井所围成的一椭圆形区域内和预测的有利区带具有十分相似的地震属性特征、沉积背景和构造背景,可能成为有利储层分布的远景区。
[Abstract]:Half of the world's oil and gas resources are stored in carbonate rocks, which makes the study of lacustrine carbonate rocks in the continental oil and gas basins more and more important. Therefore, it is of great significance to carry out the study of lacustrine carbonate deposits, reservoir characteristics and favorable reservoir distribution prediction for the guidance of oil and gas exploration. Based on the detailed investigation of the research results, guided by the basic theory of carbonate sedimentology, reservoir geology and petroleum geology, logging geology, mathematical statistics and so on, it makes full use of the data of drilling, core, logging, seismic and organic and inorganic geochemical characteristics analysis to the lake facies white of the new lower oil group in the south of the Qianjiang depression. A series of problems such as formation characteristics, reservoir characteristics and favorable reservoir distribution prediction have been systematically studied. Through the microscopic identification of rock samples in the study area and X diffraction analysis, it is believed that the research area mainly develops muddy dolomite, debris crystalline dolomite, muddy dolomite, dolomite mudstone, mudstone, gypsum mudstone and mudstone. Seven types of lithology, such as siltstone. By analyzing the depth of core depth in the core, the logging response characteristics of different types of lithology are analyzed and analyzed. Considering the accuracy of lithology identification and the identification of the main reservoir sections, the seven types of lithology are merged into four lithologies, such as dolomite, mudstone, mudstone and siltstone. On this basis, the Fisher discriminant analysis method is used to establish the logging identification model of different types of lithology, and the distribution and change law of the dolomite reservoir in the whole area is clarified. The new lower II oil group in the new valley area of the study area is divided into a kind of shallow lake facies, and the shallow lake facies is further divided into three subfacies, the lake flat, the shallow lake sand dam and the limited depression. The middle Lake flat can be divided into two microfacies of mud flat and Yunping, and the limited depressions can be divided into two types of microfacies in muddy and cloud lying areas, among which, Yunping microphase and cloud surface microfacies are the main microfacies types of dolomite development in the study area: Yunping microphase is mainly developed in the high position of potential facies in the inland area of the industrial area, and its internal storage and distribution relationship Well, the dolomite reservoir has good physical property, which is beneficial to the flow of oil and gas in the interior, and is the microfacies type of favorable reservoir development in the study area. The cloud low-lying micro facies are mainly formed in the low-lying areas, the internal reservoir distribution is poor, the dolomite monolayer thickness is large, the physical property is poor, the internal heterogeneity is strong, and it is not good for the internal flow of oil and gas. As a microfacies type of favorable reservoir development in the study area, according to the comprehensive analysis of sedimentary characteristics, it is clear that the development of lacustrine carbonate rocks in the study area is mainly controlled by three factors, which are main source, palaeogomorphic and lake level rise and fall. The study of reservoir characteristics shows that the carbonate reservoir of the new lower oil group in the study area is medium pore and ultra-low permeability reservoir, carbon The reservoir property of the acid salt rock reservoir is from good to bad. The sedimentary facies is the main controlling factor of the physical property of the reservoir. The intergranular pore in secondary pores is the main storage space in the study area, the primary micropore, the large pore space, the mold hole and the dissolution seam are the secondary storage space. There is little contribution to the improvement of reservoir physical properties. The distribution of carbonate reservoir in the new lower oil group in the study area is predicted by comprehensive discovery of oil and gas display, palaeogomorphic features, sedimentary facies distribution characteristics, effective dolomite thickness and reservoir development characteristics, and in the "C" shaped area enclosed by the new one and the new two areas. The relative high part of the structure is three sets of effective dolomite reservoir overlaps in the oil-bearing strata, which is a favorable reservoir distribution zone in the study area. In addition, it has very similar seismic attribute features in an elliptical area surrounded by well the 2 well, the new 61 well and the west 2 well, and the sedimentary background and tectonic setting may be favorable. A remote area of reservoir distribution.

【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

【参考文献】