油气地质与采收率2026，Vol.33Issue(2)：97-107,11.DOI:10.13673/j.pgre.202412037
致密砂岩储层微观孔喉特征及其对储层物性的影响
Microscopic pore-throat characteristics of tight sandstone reservoirs and their influence on physical properties of reservoir:A case study of Chang 81 Submember in Maling area,Ordos Basin
摘要
Abstract
The pore-throat characteristics of tight sandstones have strong heterogeneity,and there are various factors controlling the reservoir's physical properties.In view of the problems of unknown pore-throat characteristics and complex influencing factors of physical properties in Chang 81 Submember tight sandstone reservoir in Maling area of Ordos Basin,the microscopic pore-throat characteristics of tight sandstone reservoirs and their effects on reservoir's physical properties were studied from the aspects of pore-throat distribution and pore-throat structure characteristics through the experiments of high-pressure mercury injection,constant velocity mercury injection,and nuclear magnetic resonance.The results show that the flow performance of the tight sandstone reservoir in the study area is mainly influenced by the large and medium pore-throats(>0.2 μm),which are the main contributors to permeability.The micropore and small pore throat(<0.2 μm)occupy the main space and are the primary contributors to porosity.The average volume proportion of micropores measured by the nuclear magnetic resonance experiment is 30.08%;that of small pores is 20.31%,medium pores 32.85%,and large pores 16.76%.The average volume proportion of micropores measured by the high-pressure mercury injection test is 44.25%,and that of small pores is 25.55%,medium pores 23.47%,and large pores 6.73%.The results of nuclear magnetic resonance and high-pressure mercury injection experiments are consistent in trend.It is suggested that nuclear magnetic resonance experimental methods be adopted in the study of pore-throat distribution characteristics to avoid core destruction.The physical properties of tight sandstone reservoirs,especially permeability,are mainly controlled by throats,while porosity is influenced by both pores and throats in a similar way.关键词
孔喉特征/核磁共振/影响因素/致密砂岩/鄂尔多斯盆地Key words
pore-throat characteristic/nuclear magnetic resonance/influencing factor/tight sandstone/Ordos Basin分类
能源科技引用本文复制引用
刘建,石璐铭,韩秋雅,丁帅伟,段文豪,张心罡,贾士琚,许川..致密砂岩储层微观孔喉特征及其对储层物性的影响[J].油气地质与采收率,2026,33(2):97-107,11.基金项目
国家自然科学基金项目"数据与模型融合驱动的油藏CO2驱埋协同智能高效优化方法研究"(52474044),陕西省自然科学基础研究计划"数据-模型融合驱动粒子群算法的压裂水平井立体井网多维智能优化方法"(2024JC-YBMS-328). （52474044）
