石油地质与工程2025，Vol.39Issue(5)：50-55,6.DOI:10.26976/j.cnki.sydz.202505009
直罗油田大东沟区长8油藏致密砂岩储层微观特征
Microscopic characteristics of tight sandstone reservoirs in Chang 8 Reservoir of Dadonggou Area,Zhiluo Oilfield
摘要
Abstract
Low-permeability tight oil reservoirs in the Ordos Basin have emerged as pivotal targets for con-temporary oil and gas exploration.However,their complex accumulation mechanisms and pronounced heter-ogeneity present formidable challenges to exploration and development efforts.To address these challenges,a multi-technique approach was employed for a comprehensive evaluation of the Chang 8 tight sandstone reservoirs in the Dadonggou area of Zhiluo Oilfield.Analytical methods included scanning electron microsco-py(SEM),cast thin section analysis,high-pressure mercury intrusion(HPMI),constant-rate mercury intrusion(CRMI),nitrogen adsorption,micro-CT scanning,and nuclear magnetic resonance(NMR).Findings reveal that the pore-throat configuration of these reservoirs is predominantly characterized by the small-pore micro-throat type,followed by the small-pore fine-micro throat type.Pore sizes primarily range within the micro-to-nano scale,with movable fluid porosity values varying from 0.231%to 4.024%.Notably,micro-pore throat structures and seepage characteristics significantly influence the quality disparities among tight sandstone reservoirs.Based on a six-element reservoir classification system,the Chang 8 reservoirs were categorized into four types.CategoriesⅡandⅢare identified as the dominant reservoir types in the study area,underscoring their significance for future exploitation strategies.关键词
鄂尔多斯盆地/直罗油田/长8 油藏/致密砂岩储层Key words
Ordos Basin/Zhiluo Oilfield/Chang 8 reservoir/tight sandstone reservoir分类
能源科技引用本文复制引用
丁磊,王伟..直罗油田大东沟区长8油藏致密砂岩储层微观特征[J].石油地质与工程,2025,39(5):50-55,6.基金项目
延长石油(集团)有限责任公司项目"长8油藏致密油储层微观特征实验分析及精细表征"(YJKFS22SFW0008). （集团）
