西南石油大学学报（自然科学版）2018，Vol.40Issue(2)：91-97,7.DOI:10.11885/j.issn.1674-5086.2016.04.25.01
不同渗透率岩芯孔径分布与可动流体研究
Study on Influence of Permeability and Distribution of Pore Diameters in Rock Cores on Measurement of Mobile Fluid Saturation
摘要
Abstract
To understand why the calculation of original oil saturation through mercury injection capillary pressure (MICP) curves always yields excessively large values,we measured the mobile fluid saturation of a set of selected samples using nuclear magnetic resonance (NMR),high-speed centrifugation,and conventional mercury injection experiments.Comparisons were then performed to analyze how the mobile fluid saturation in different pore diameter ranges differed from the MICP-measured value of mobile fluid saturation,to reveal the underlying causes of these differences.The experimental results indicated that,in ultralow-permeability reservoir cores (0.1mD＜K＜1.0mD),MICP-measured saturation was significantly larger than NMRmeasured mobile fluid saturation.Our analysis revealed that this was caused by differences in the quantity of injected mercury and the volume of mobile fluids (as measured by NMR),because of the restrictions imposed by small pore throats.In low-permeability reservoir cores (1.0mD＜K＜10.0mD),MICP measurements of mobile fluid saturation may still result in larger values than the corresponding NMR measurements.In reservoir cores with high levels of permeability (K＞10.0mD),the difference between the MICP-measured saturation and the total mobile fluid saturation was relatively small.In this case,it was found that both the injected mercury and mobile fluids were mainly distributed within pore throats with radii greater than 1.00μm.关键词
核磁共振/常规压汞/砂岩/可动流体饱和度/原始含油饱和度Key words
NMR/conventional MICP measurements/sandstones/mobile fluid saturation/original oil saturation分类
能源科技引用本文复制引用
宁宁,李怡超,刘洪林,周尚文..不同渗透率岩芯孔径分布与可动流体研究[J].西南石油大学学报（自然科学版）,2018,40(2):91-97,7.基金项目
国家科技重大专项(2011ZX05013-006) （2011ZX05013-006）
国家重点基础研究发展计划(973计划)(2013CB2281) （973计划）
