大庆石油地质与开发2025，Vol.44Issue(4)：51-59,9.DOI:10.19597/J.ISSN.1000-3754.202309045
四川盆地仪陇-平昌地区须家河组致密砂岩气储层微观孔隙结构及其对储层物性的影响
Microscopic pore structure of tight sandstone gas reservoirs of Xujiahe Formation in Yilong-Pingchang area of Sichuan Basin and its influence on reservoir physical properties
摘要
Abstract
In view of complex rock types and unclear micro-pore structure characteristics of tight sandstone reser-voirs of Xujiahe Formation in Yilong-Pingchang area in northeast Sichuan Basin,52 tight sandstone reservoir sam-ples are optimized,and micro-pore structure of tight sandstone reservoirs and its influence on reservoir properties are revealed via experimental methods of FESEM,low-temperature nitrogen adsorption,high-pressure mercury in-jection and NMR.The results show 7 types of pores developed in Xujiahe Formation,including primary intergranu-lar pores,residual intergranular pores,intergranular dissolved pores,intragranular dissolved pores,heterobasic pores,clay mineral intercrystaline pores and micro-fractures.Pore geometry is mainly parallel plate pores.Pore throat structure is divided into 4 types including weak platform,slow straight line,steep straight line and upward convex,with steep straight line corresponding to optimal pore throat structure.Xujiahe Formation has large range of pore size distribution,with coexistence of micron-scale and nanoscale,dominated by nanoscale pores,and mainly medium and large pores developed.Micro-pore structure has much influence on reservoir properties,and both po-rosity and permeability are affected by micro-pore structure.There is significant correlation between pore throat radi-us and permeability,so permeability is more affected.Micro-pore structure of Xujiahe Formation is increasingly complex from bottom to top,leading to gradual deterioration of properties.Xu 2 Member has maximum pore size,short pore throat and optimal reservoir properties.Xu 4 Member has relatively small pore size,narrow pore throat and secondly good properties.Xu 6 Member has small pore size,narrow throat and the worst properties.The re-search provides basis for further tight gas exploration in northeast Sichuan.关键词
微观孔隙结构/非均质性/致密砂岩储层/须家河组/川东北/仪陇-平昌地区Key words
micro-pore structure/heterogeneity/tight sandstone reservoir/Xujiahe Formation/northeast Sich-uan/Yilong-Pingchang area分类
能源科技引用本文复制引用
张迪,安测,王显东,王有智,王志国,成德安,马威奇,陈绪强,祝斯淼,朱彦平..四川盆地仪陇-平昌地区须家河组致密砂岩气储层微观孔隙结构及其对储层物性的影响[J].大庆石油地质与开发,2025,44(4):51-59,9.基金项目
中国石油天然气股份有限公司科学研究与技术开发项目"四川盆地大庆探区侏罗系陆相页岩油富集机理与关键评价技术研究"(2022DJ1809). （2022DJ1809）
