测井技术2025，Vol.49Issue(6)：917-928,12.DOI:10.16489/j.issn.1004-1338.2025.06.009
准噶尔盆地八道湾组深层砂岩储层微观孔隙结构全尺度表征方法
Full-Scale Characterization Method of Microscopic Pore Structure of Deep Sandstone Reservoirs in Badaowan Formation of Junggar Basin
摘要
Abstract
The deep sandstone reservoirs of the Badaowan formation in the Junggar basin exhibit complex pore structures and strong microscopic heterogeneity.Understanding the microscopic pore characteristics is crucial for accurate reservoir evaluation.In this study,the deep sandstone reservoir of the Badaowan formation in the Mosuowan uplift of the Junggar basin is selected as the research object.A full-scale characterization of the microscopic pore structure is conducted by the joint application of CO2 adsorption,N2 adsorption,and high-pressure mercury intrusion experiments.Experimental results indicate that reservoir pores are mainly slit-like and open channel-like,with a multi-peaked pore size distribution.Overall,the reservoir is characterized by low pore volume and strong heterogeneity.Macropores dominate the total pore volume,typically contributing more than 85%,while the specific surface area is mainly controlled by micropores and mesopores.Based on the N2 adsorption hysteresis loops,two pore structure types are identified:Type I,characterized by an H4 hysteresis loop,representing a micropore-dominated structure with slit-like pores;and Type II,featuring an H3 hysteresis loop,indicative of a mesopore-dominated structure with open groove-like pores.Mineral composition exerts a significant control on pore structure.The sand content(quartz together with feldspar)is closely related to the degree of pore development:as sand content increases,the average pore size of micropores decreases,while the macropore volume increases.Conversely,a higher clay mineral content tends to fill macropores,reducing overall pore connectivity.In summary,reservoirs with high sand and low clay content exhibit better pore development,with macropore volume contributions exceeding 85%,making this parameter a key indicator for identifying high-quality reservoirs.These findings provide important insights for predicting favorable reservoir sweet spots in the deep sandstone of the Badaowan formation in the Junggar basin.关键词
深层砂岩储层/侏罗系八道湾组/孔隙结构/高压压汞/低温吸附/全尺度表征Key words
deep sandstone reservoir/Jurassic Badaowan formation/pore structure/high pressure mercury intrusion/low temperature adsorption/full-scale characterization分类
天文与地球科学引用本文复制引用
ZHAO Ziling,WANG Liang,ZHANG Hao,YUAN Bing,YIN Qi,AI Yizhuo,LIU Xingyu..准噶尔盆地八道湾组深层砂岩储层微观孔隙结构全尺度表征方法[J].测井技术,2025,49(6):917-928,12.基金项目
国家资助博士后研究人员计划"页岩油储层孔隙流体赋存状态研究"(GZC20230328) （GZC20230328）
