金山气田营城组砂岩成岩作用与储层物性特征研究

发布时间：2018-03-02 02:09

本文关键词： 金山气田营城组岩石学特征成岩作用物性特征　出处：《吉林大学》2015年硕士论文　论文类型：学位论文

【摘要】：营城组是金山气田的潜在储集层位，也是本论文研究的目的层位。论文对金山气田储层砂岩的岩石学特征、成岩作用特征及储层物性特征进行了研究，并对储层物性的影响因素进行了分析，为进一步的油气勘探提供理论上的支持，从而提高钻探成功率，降低勘探风险，对提高经济效益具有重要意义。本文在对金山气田4口井野外岩心描述的基础上，通过普通薄片、铸体薄片、扫描电镜、X—衍射等技术方法和手段，综合分析确定了研究区储层砂岩的岩石类型。金山气田营城组砂岩的主要岩石类型为岩屑长石砂岩，中粗粒砂状碎屑结构，磨圆为次棱角—次圆状，分选差，颗粒支撑，颗粒间以点—线接触为主，填隙物主要为胶结物，发育连生结构、次生加大边结构。概括总结了成岩作用类型，划分了成岩作用阶段，建立了主要的成岩作用演化序列。金山气田营城组储层砂岩发育的成岩作用类型有：机械压实作用、压溶作用、胶结作用、交代作用、溶解作用和蚀变作用，其中机械压实作用和压溶作用发育程度高，造成颗粒之间紧密堆积，致使粒间孔隙大量减少；胶结作用强烈，胶结物类型多，胶结期次复杂，导致原生粒间孔大量减少；同时溶解作用发育程度差，次生孔隙含量不高，这些因素综合作用影响了本区孔隙发育的程度。根据泥岩粘土矿物组合、伊/蒙混层比特征以及颗粒接触类型等因素，判断出营城组储层砂岩成岩作用阶段达到中成岩阶段A期。研究了储层物性特征，金山气田营城组砂岩发育的孔隙类型包括：原生粒间孔（36.9%）、粒内溶蚀孔（51.1%）、扩大粒间孔（3.9%）、粒内微孔（6.9%）和铸模孔（1.3%）；面孔率偏低，喉道以较细喉为主，连通性较好。孔隙度主要为特低孔，渗透率以超低渗—特低渗为主，储层类型主要为特低孔——特低渗—超低渗型储层。分析了成岩作用对孔隙特征的影响，机械压实作用、胶结作用、溶解作用和交代蚀变作用对储层有重要的影响。随着埋深增加，机械压实作用增强，总体上物性变差；但当深度为2310—2450m时，，受溶解作用的影响，形成次生孔隙富集带，储层物性相对变好。
[Abstract]:Yingcheng formation is the potential reservoir of Jinshan gas field and the target horizon of this paper. The petrological characteristics, diagenesis and physical properties of reservoir sandstone in Jinshan gas field are studied in this paper. The influencing factors of reservoir physical properties are analyzed in order to provide theoretical support for further oil and gas exploration so as to improve the success rate of drilling and reduce the exploration risk. It is of great significance to increase economic benefits. On the basis of field core description of 4 wells in Jinshan gas field, this paper adopts technical methods and means, such as ordinary sheet, cast thin slice, scanning electron microscope (SEM) and X-ray diffraction (SEM), etc. The main rock types of the sandstone of Yingcheng formation in Jinshan gas field are lithic feldspar sandstone, medium coarse grain sandlike clastic structure, grinding circle with sub-angle-sub-circular shape, poor sorting, grain support, etc. The intergranular contact is mainly point-line contact, and the interstitial material is mainly cemented, with a contiguous structure and a secondary enlarged edge structure. The diagenesis types are summarized, the diagenesis stages are divided, and the main diagenesis evolution sequences are established. The diagenesis types of sandstone development in Yingcheng formation reservoir of Jinshan gas field are mechanical compaction, pressure-solution, cementation, etc. Metasomatism, dissolution and alteration, in which mechanical compaction and pressure-dissolution are highly developed, resulting in a close accumulation of particles, resulting in a large reduction of intergranular pores, strong cementation, many types of cementation, and complex cementation periods. As a result of the decrease of primary intergranular pores, the poor development of dissolution and the low content of secondary pores, these factors affect the degree of pore development in this area. According to the clay mineral assemblage of mudstone, It is concluded that the diagenesis stage of sandstone in Yingcheng formation reached the stage A of middle diagenesis due to the characteristics of the ratio of Iraq to Mongolia and the type of contact between grains and so on. The characteristics of reservoir physical properties have been studied. The pore types of sandstone developed in Yingcheng formation of Jinshan gas field include: primary intergranular pore (36.9%), intragranular dissolution pore (51.1%), expanded intergranular pore (3.9m), intragranular micropore (6.9g) and casting mold pore (1.3C), low porosity, and the main throat channel is finer throat. The porosity is mainly ultralow porosity, the permeability is ultralow permeability and the reservoir type is mainly ultralow porosity-ultralow permeability reservoir. The influence of diagenesis on pore characteristics, mechanical compaction, cementation, dissolution and metasomatism are analyzed. However, when the depth is 2310-2450m, the secondary pore enrichment zone is formed, and the physical properties of the reservoir become better.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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