华池-南梁地区长6储层特征研究

发布时间：2018-02-22 07:53

本文关键词： 长6油层组储层特征沉积相岩石类型孔隙特征控制因素　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：鄂尔多斯盆地是我国重要的油气盆地,具有很大的开发潜力,华池-南梁地区位于鄂尔多斯盆地中部,随着近年来快速高效建产,后续接替储量明显不足,急需寻找新的产建区块。在华池-南梁地区中延长组长6油层组为中生界主要的含油油层,在该地区分布相对广泛,含油显示普遍,前期已有多口井获得工业油流,具有良好的勘探前景。本论文将更加深入地对研究区沉积特征、储层特征进行分析,通过编制各种平面图件,以岩心观察为基础,通过沉积构造、岩石学等对长6油藏厚层砂体沉积成因进行分析,建立起沉积模式。在沉积相分析的基础上,通过孔渗资料、相渗分析和薄片鉴定以及压汞分析,分析储层砂岩的渗流机理、孔隙类型和成岩作用以及孔喉结构。沉积相分析认为研究区长6油层组主要包括了重力流沉积和半深湖沉积以及三角洲前缘沉积体系。岩石学的基础研究表明长6油层组储层岩石类型主要为岩屑长石砂岩以及细-中粒岩屑长石砂岩并且储层砂岩成分成熟度和填隙物具有东西分带、南北分区的特点。对储集层孔隙特征的研究表明长6油层组储层空间主要包括粒间孔、粒间溶孔、粒内溶孔和晶间孔,其中剩余原生粒间孔和粒内溶孔是主要类型。由华池-南梁地区相渗透率特征分析可知,长6油层组属亲水型储层并且储层具碱敏、酸敏和弱盐敏以及弱速敏、弱水敏特性。在储层均质性特征方面,长6油层组层内非均值性属于中等非均质储层-均质储层,而层间具有较弱的非均值性,并且各小层之间具有自下而上非均质性变强的特点。储层控制因素分析表明长6油层组储集性能主要受沉积相、岩石类型和成岩等多因素控制。在该多种因素影响下,水下分流河道和砂质碎屑流砂体是储层物性的高值区,绿泥石膜的含量与原生粒间孔之间呈正相关性,早期绿泥石胶结作用和溶蚀作用对储层形成也具有建设性的作用。
[Abstract]:The Ordos Basin is an important oil and gas basin in China with great potential for development. The Huachi-Nanliang area is located in the central part of the Ordos Basin. With the rapid and efficient construction and production in recent years, the subsequent replacement reserves are obviously insufficient. In Huachi-Nanliang area, Yanchang formation No. 6 is the main oil-bearing reservoir in Mesozoic, and it is widely distributed in this area, which shows that oil content is widespread, and industrial oil flow has been obtained from many wells in the early period. In this paper, the sedimentary characteristics and reservoir characteristics of the study area will be analyzed more deeply. On the basis of sedimentary facies analysis, based on the analysis of sedimentary facies, the percolation mechanism of sandstone in Chang 6 reservoir is analyzed by means of pore permeability data, phase permeability analysis, thin slice identification and mercury injection analysis. Pore types, diagenesis and pore throat structure. Sedimentary facies analysis shows that the Chang 6 reservoir in the study area mainly includes gravity flow deposition, semi-deep lacustrine deposition and delta front sedimentary system. 6 the reservoir rock types of reservoir are mainly lithic feldspar sandstone and fine to medium grain lithic feldspar sandstone. The study on pore characteristics of reservoir shows that the reservoir space of Chang 6 reservoir mainly includes intergranular pore, intergranular dissolved pore, intragranular dissolved pore and intergranular pore. The residual primary intergranular pore and intragranular dissolved pore are the main types. From the analysis of the permeability characteristics of the facies in Huachi-Nanliang area, it can be seen that the Chang 6 reservoir is hydrophilic and has alkali, acid and salt sensitivity and weak velocity sensitivity. In terms of reservoir homogeneity, the non-mean value in Chang 6 reservoir belongs to medium heterogeneity reservoir and homogeneous reservoir, while the interlayer has weak non-mean value. The reservoir control factor analysis shows that the reservoir performance of Chang 6 reservoir is mainly controlled by sedimentary facies, rock type and diagenesis. The underwater distributary channel and sand clastic flowing sand body are the high value areas of reservoir physical properties. The content of chlorite film is positively correlated with the primary intergranular pore, and the early chlorite cementation and dissolution also play a constructive role in reservoir formation.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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