特种油气藏2026，Vol.33Issue(3)：24-33,10.DOI:10.3969/j.issn.1006-6535.2026.03.003
鄂尔多斯盆地清涧地区上古生界致密砂岩孔喉结构对天然气渗流能力的影响
Influence of pore-throat structure on natural gas flow capacity in Upper Paleozoic tight sandstones in the Qingjian Area,Ordos Basin
摘要
Abstract
In view of the large number of low-production wells and the widespread occurrence of water production in the Qingjian area,constant-rate mercury injection and gas-water relative permeability experiments were carried out to investigate the petrophysical properties and pore characteristics of tight sandstone gas reservoirs in the He 8 and Shan 2 members in the study area.The study clarified the controlling effects of key parameters,including pore size,distribution,throat morphology,and connectivity,on natural gas flow capacity.The results show that the reservoirs in the study area are characterized overall by low porosity and low permeability.Among them,samples from the Shan 23 Submember with permeability greater than 1.00 mD occur at a higher frequency than those from the He 8 Member,and their rock type,interstitial materials and pore-throat structure are all superior to those of the He 8 Member.The study confirms that porosity is the decisive factor governing hydrocarbon enrichment,whereas the structural matching between pores and throats directly determines reservoir flow capacity.At the same time,reservoir tightness is posi-tively correlated with bound water saturation,which directly weakens natural gas flow capacity.This study provides an important technical basis for the evaluation and development of regional tight sandstone gas reservoirs.关键词
鄂尔多斯盆地/清涧地区/致密砂岩气/渗流能力/孔喉结构/束缚水饱和度Key words
Ordos Basin/Qingjian Area/tight sandstone gas/flow capacity/pore-throat structure/bound water saturation分类
能源科技引用本文复制引用
丛琳,史亚宁,范毅君,胡爱平,史云鹤,蔡洪波,文慧俭..鄂尔多斯盆地清涧地区上古生界致密砂岩孔喉结构对天然气渗流能力的影响[J].特种油气藏,2026,33(3):24-33,10.基金项目
海南省科技专项"深海碎屑岩次生孔隙形成机制及分布预测——以珠江口盆地文昌凹陷为例"(ZDYF2024GXJS015) （ZDYF2024GXJS015）
