致密储层成岩储集相分类孔隙演化分析及其微观孔隙结构特征  

Pore-evolution analysis and microscopic pore-structurecharacteristics of diagenetic reservoir facies classification of tight reservoirs

作　　者：宋子齐[1] 景成[2] 李泽亮[1,3] 屈艳梅[1] 忽磊磊 胡秀[1] 

机构地区：[1]西安石油大学石油工程学院 [2]中国石油大学(华东)石油工程学院 [3]中国石油长庆油田苏里格南作业分公司

出　　处：《低渗透油气田》2014年第2期24-29,79,共7页

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“致密气藏与测井采集处理与评价技术研究”（2010E-23-04）：国际自然科学基金项目“变形介质复杂储层应力敏感性的岩石流变学机理及动态模型”（51104119）.

摘　　要：苏里格气田东区致密储层受多期沉积、成岩及构造等作用影响，成岩过程中压实和胶结作用强烈，成岩作用复杂，储层具有孔隙空间小、孔隙结构复杂等特点。在对成岩储集相形成的有利因素与不利条件进行分析的基础上，阐述致密储层成岩过程孔隙演化基本规律及其岩性、物性、孔隙类型、孔隙结构特征，在研究区划分出Ⅰ、Ⅱ、Ⅲ、Ⅳ类成岩储集相类型。通过对该区盒8、山1、山2段岩心样品分析及储集空间鉴定结果，沿成岩过程进行孔隙度演化分析推演，得出不同成岩储集相各成岩阶段孔隙演化参数和孔隙演化模式，提出了不同成岩储集相成岩作用强弱造成不同岩性、物性、孔隙类型结构差异及特征。从而对该区分类成岩储集相微观孔隙结构特征参数进行统计分析，阐明了该区孔喉排驱压力、中值压力高，孔喉分选系数、变异系数、均质系数范围大。最大孔喉半径、退汞效率和结构综合参数偏低且分布范围大．微观孔隙类型组合复杂，孔隙结构特征参数差。指出其中Ⅰ、Ⅱ类成岩储集相各类孔喉结构参数分布在相对较好范围，孔隙分选系数、变异系数、均质系数处于相对较窄居中及孔渗高值部位，具有相对较好的孔隙结构及渗流、储集特征，成为该区致密储层筛选优质储层的主要目标。The basic law of the pure evolution in the diagenetic process, the lithology, physical properties, pore types, and pore struc- ture features of the tight reservoirs are expatiated on the basis of analyzing favorable factors and unfavorable conditions ureter which the diagenetic reservoir facies formed. In the research area the diagenetic reservoir facies are divided into four types of 1, 11, IIl and IV. In accordance with the core sample analysis and reservoir space identification result of He8, Shanl and Shan2 Members in this region, the porosity evolution is analyzed and deducted along the diagenetic process. The porosity evolution parameters and porosity evolution models on each diagenetic stage of various diagenetic reservoir facies are obtained. The authors propose that the diagenesis intensity of various diagenetic reservoir facies causes different features such as lithology, physical properties, pore types, and pore structures. Thus the characteristic parameters of microcosmic pore structures of the classified diagenetic reservoir facies in the area are statistically analyzed. It is expounded that in the area the pore-throat displacement pressure and the median pressure are high. The pore-throat sorting eoeffieient, variation coefficient, and homogeneity eoefficient have large ranges. The maximum pore-throat ra- dius, ejection efficiency （efficiency of mercury withdrawal）, and comprehensive structure parameters are of low in value, and of large in distribution range, with complex combination of microcosmic pore types, and poor parameters of pore structure features. Moreow;r, various pore-tluxmt structure parameters of the types Ⅰ and Ⅱ diagenetic reservoir facies are distributed in relatively good ranges. The pore sorting coefficient, variation coefficient, and homogeneity coefficient are in relatively narrow and centered position with high porosity and permeability values. They have a relatively fine pore structures, percolation and reservoir characteristics, being the main target for selecting qu

关 键 词：致密储层 成岩储集相分类 成岩过程 孔隙演化分析 微观孔隙结构 优质储层筛选 苏里格气田东区 

分 类 号：P618.130.1[天文地球—矿床学]