川西北中泥盆统油砂岩储层特征及成岩作用研究

发布时间：2018-04-04 20:55

本文选题：二郎庙　切入点：石英砂岩　出处：《成都理工大学》2015年硕士论文

【摘要】：四川盆地位于西南地区,是我国最重要的含油气盆地之一,二郎庙地区位于四川盆地西北缘龙门山构造带北段南侧的江油市境内,构造上与矿山梁—天井山—二郎庙冲断背斜带叠置。在十几年的勘探实践中在龙门山构造带北段已发现多套含油砂岩,如分布于江油-广元地区的沙溪庙组油砂岩,具有露头油苗分布广、油气显示好和资源量大等特点,早在20世纪50年代便开始对该地区油砂资源进行地表调查和专题研究,已钻的9口浅井中有一口井在91m处钻获27m厚的油砂,含油量较高,显示出较为丰富的资源储量和良好的勘探前景。而近期在龙门山北段天井山构造带新发现的泥盆系油砂古油藏,更加增添了对龙门山北段油砂矿产资源进行勘探的实践和理论意义。本论文以四川盆地江油二郎庙地区中泥盆统石英砂岩为研究对象,以储层综合评价为目的,在实测剖面和详细观察岩心的基础上,运用薄片鉴定、扫描电镜、孔渗分析及X射线衍射等测试技术手段,研究石英砂岩储层的矿物组分、粒度及成岩作用和演化模式,分析储层的成因和主要控制因素,对储集空间类型进行分类讨论,并对储层进行了综合评价。主要研究成果有如下几点:(1).龙门山构造带北段的中泥盆统油砂岩主要为一套前滨微相的中-细粒石英砂岩,成分和结构成熟度都极高,冲洗层理非常发育,连续叠置的砂体厚度巨大;(2).砂岩储层的孔隙类型较为简单,储集空间主要为原生粒间孔,少量为长石及岩屑被溶蚀作用形成的粒间溶孔、粒内溶孔和铸模孔,极少量为充填粒间溶孔的自生矿物集合体中的晶间孔。(3).该套石英砂岩可作为以原生粒间孔隙为主的典型储层模型,孔隙连通性极好,孔隙度和渗透率具有很好的正相关关系,排驱压力很低,喉道一般较大,孔隙结构较好,为优质储层类型。
[Abstract]:The Sichuan Basin is located in the southwest of China and is one of the most important oil-bearing basins in China. The Erlangmiao area is located in Jiangyou City, south of the Longmenshan structural belt in the northwest margin of the Sichuan Basin.Structural superposition with mine Liang- Tianjingshan-Erlangmiao thrust anticline belt.In the exploration practice of more than ten years, many sets of oil-bearing sandstone have been found in the northern section of Longmenshan structural belt, such as the oil sandstone of Shaximiao formation distributed in Jiangyou-Guangyuan area, which has the characteristics of wide outcrop distribution of oil and gas, good oil and gas display and large amount of resources, etc.As early as the 1950s, the oil sand resources in this area were investigated and studied on the surface. One of the 9 shallow wells drilled has obtained 27m thick oil sand at 91m, and the oil content is relatively high.It shows abundant resource reserves and good exploration prospect.The recent discovery of the Devonian oil sand paleoreservoir in the northern Longmen Mountain Liangjingshan structural belt has added practical and theoretical significance to the exploration of oil sand mineral resources in the northern Longmen Mountains.In this paper, the middle Devonian quartz sandstone in Jiangyou Erlangmiao area, Sichuan Basin is taken as the research object. The purpose of this paper is to evaluate the reservoir synthetically, on the basis of the measured section and the detailed observation of the core, using thin slice identification and scanning electron microscope.By means of pore permeability analysis and X-ray diffraction, the mineral composition, granularity, diagenesis and evolution pattern of quartz sandstone reservoir are studied, the origin and main controlling factors of reservoir are analyzed, and the reservoir space types are classified and discussed.The reservoir is evaluated synthetically.The main research results are as follows: 1.The Middle Devonian oil-bearing sandstone in the northern section of Longmenshan structural belt is mainly a set of foreshore microfacies medium-fine-grained quartz sandstone with very high maturity of composition and structure. The flushing bedding is very developed, and the continuous overlay sand body has a huge thickness.The pore type of sandstone reservoir is relatively simple, the reservoir space is mainly primary intergranular pore, a small amount of intergranular solution pore formed by dissolution of feldspar and lithic debris, intragranular dissolved pore and mold pore,A very small number of intergranular pores are found in the authigenic mineral aggregates filled with intergranular dissolved pores.This set of quartz sandstone can be used as a typical reservoir model with primary intergranular pores, excellent porosity connectivity, good positive correlation between porosity and permeability, low displacement pressure, large throat, and good pore structure.It is a high quality reservoir type.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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