油气地质与采收率2025，Vol.32Issue(5)：146-154,9.DOI:10.13673/j.pgre.202404034
页岩油水饱和度分析方法改进及应用
Improved analysis methods and applications for shale oil-water saturation
摘要
Abstract
Shale oil-water saturation is a core parameter for evaluating the potential and development feasibility of shale oil reservoirs.Currently,the primary methods for analyzing oil and water saturation include the atmospheric pressure dry distillation method,the distillation extraction method,the alcohol grinding extraction method,and the nuclear magnetic resonance(NMR)method.Due to the characteristics of shale,such as its rich organic matter,low water content,and high mud content,the wall-sticking phenomenon and pore heterogeneity of parallel rock samples in commonly used analysis methods can cause greater deviations in experimental results.Meanwhile,the lack of calibration for the NMR method results in significant differences in the results compared to other methods.Based on the improved extraction method,this paper establishes a calibration method for analyzing the water saturation of shale oil using T1-T2 spectrum analysis through an experiment that combines alcohol immersion extraction and NMR measurement.The water saturation of the same shale rock sample was accurately analyzed through the alcohol immersion extraction method.The alcohol extraction time was determined to be 40 days based on the variation relationship of the extracted water volume with time.The oil washing time was determined to be 30 days based on the variation relationship of the crude oil in the rock sample with the oil washing time.The correction method of the extracted water volume was determined based on the drying temperature of the clay-bound water.The T1-T2 spectra of fresh rock samples and saturated water rock samples were analyzed,and a T1-T2 spectrum interpretation chart for the oil-water distribution in Jiyang shale was established based on the effective pore T2 cutoff value,thereby rapidly obtaining the oil-water saturation.The fresh rock samples from multiple closed coring wells in shale oil reservoirs were analyzed,and the oil saturation of the effective reservoir space in the Jiyang shale oil reservoir is mainly between 45%and 80%,with no correlation with the depth of the rock sample.A larger effective porosity means a higher oil saturation,and oil content is high in reservoirs with well-developed laminae.关键词
页岩油/饱和度/核磁共振/储量/济阳坳陷Key words
shale oil/saturation/NMR/reserve/Jiyang Depression分类
能源科技引用本文复制引用
孙志刚,贾丽华,周静,张礼臻,张红欣,吴秀英,张玉利..页岩油水饱和度分析方法改进及应用[J].油气地质与采收率,2025,32(5):146-154,9.基金项目
国家联合基金项目"陆相断陷湖盆页岩油富集机理与立体开发方法"(U24B6002). （U24B6002）
