地质科技通报2026，Vol.45Issue(2)：91-105,15.DOI:10.19509/j.cnki.dzkq.tb20240683
致密砂岩储层孔隙结构对流体可动程度的影响及综合表征
Influence of pore structure of tight sandstone reservoirs on fluid mobility and comprehensive characterization
摘要
Abstract
[Objective]Reservoir fluid mobility is significantly influenced by the combined effects of reservoir physical properties and pore structure,and cannot be accurately characterized by a single parameter.This study aims to apply a comprehensive pore structure characterization to evaluation tight sandstone reservoirs.[Methods]In this study,the effective movable fluid porosity(φcutoff)and effective movable fluid pore throat radius(rcutoff)were calculated by integrating nuclear magnetic resonance(NMR)and high-pressure mercury intrusion(HPMI)with fractal theory for the Triassic Chang 82 tight sandstone reservoir in the Heshui area of the Ordos Basin.To explore the relationship between pore structure parameters and the degree of fluid mobility in the reservoir,principal component analysis(PCA)was employed to extract factors,and k-means clustering was introduced to establish a comprehensive evaluation approach for fluid mobility of tight sandstones.[Results]The results showed that the pore throat types of the target layer in the study area were predominantly medium-small pores and medium-fine throats,and movable fluid mainly resided in pores with pore sizes of 0.01-1.0 μm.The fractal dimension ranged from 2.440 0 to 2.741 2,with an average of 2.55.The effective movable fluid pore throat radius ranged from 0.016 to 0.095 μm,with an average value of 0.049 μm.The effective movable fluid porosity ranged from 0.716%to 2.980%,with an average value of 1.598%.By integrating parameters of fluid mobility,physical properties,and pore structure,four principal components were extracted to evaluate reservoir permeability and storage capacity,microscopic heterogeneity,production capacity,and the proportion of large pore throats.Based on the clustering results from the first three principal components,the samples were classified into Class Ⅰ,Ⅱ,and Ⅲ.[Conclusion]The comprehensive evaluation results of fluid mobility can provide a basis for reservoir evaluation and efficient development of similar tight sandstone oil reservoirs.关键词
联合表征/孔隙结构/分形维数/主成分分析(PCA)/k-means聚类分析/流体可动程度Key words
joint characterization/pore structure/fractal dimension/principal component analysis(PCA)/k-means clustering/fluid mobility分类
天文与地球科学引用本文复制引用
陈琪泉,李超,成友友,谭习群,罗翔,赵子萱,闫晨辉,谭成仟..致密砂岩储层孔隙结构对流体可动程度的影响及综合表征[J].地质科技通报,2026,45(2):91-105,15.基金项目
中国石油科技创新基金研究项目(2022DQ02-0202) （2022DQ02-0202）
陕西省自然科学基础研究计划项目(2024JC-YBQN-0397). （2024JC-YBQN-0397）
