一种基于压汞-吸附法的不规则泥页岩样品孔隙度测定方法  

A Porosity Measurement Method for Irregular Shale Samples Based on Mercury Injection-Adsorption

作　　者：徐二社[1,2,3] 刘鹏 曹婷婷[1,2,3] 贾梦瑶[1,2,3] 刘雅慧 李志明[1,2,3] XU Ershe;LIU Peng;CAO Tingting;JIA Mengyao;LIU Yahui;LI Zhiming(Wuxi Research Institute of Petroleum Geology,Sinopec Petroleum Exploration and Development Research Institute,Wuxi,Jiangsu 214126,China;Key Laboratory of Petroleum Accumulation Mechanisms,Sinopec,Wuxi,Jiangsu 214126,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,Beijing,100083,China)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [2]中国石油化工集团公司油气成藏重点实验室,江苏无锡214126 [3]页岩油气富集机理与高效开发全国重点实验室,北京100083

出　　处：《西安石油大学学报（自然科学版）》2023年第6期39-45,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金项目“陆相富有机质页岩成烃动态演化与烃类赋存机理”(42090022)。

摘　　要：针对泥页岩样品孔隙度测定中柱塞样制备难度大,低孔、低渗样品测定结果误差大等问题,采用压汞-吸附法对泥页岩块状样品、粉末状样品分别开展高压压汞、低温N_(2)、CO_(2)吸附实验,通过Washburn方程、BJH模型及DR模型分析,获取岩样总孔容,与压汞实验所测岩样密度相乘,即可求取不规则泥页岩样品的孔隙度。实验结果表明,压汞-吸附法对于孔隙发育程度不一的白云质泥岩、页岩、粉砂岩等多种岩性均具有较好的适用性,且与氦气法、煤油法具有可比性及一致性,可以作为多种岩性孔隙度测定的统一实验方法。In view of the difficulty in preparing plunger samples in the porosity test of shale samples and the large error in the porosity test of low-porosity low-permeability samples,the high-pressure mercury intrusion,low-temperature N_(2),and CO_(2)adsorption experiments of shale block samples and powder samples were carried out by the mercury intrusion-adsorption method.The total pore volume of rock samples is obtained by Washburn equation,BJH model,and DR model,which is multiplied by the density of the rock sample measured by the mercury intrusion experiment to obtain the porosity of the irregular shale samples.The experimental results indicate that the mercury intrusion-adsorption method has good applicability for the porosity test of dolomite mudstone,shale,siltstone and other lithologic samples with different pore development degrees,and its test results are comparable and consistent with those of helium method and kerosene method,which can be used as a unified experimental method for porosity measurement of multiple lithologic samples.

关 键 词：泥页岩孔隙度 不规则样品 压汞-吸附法 氦气法 煤油法 

分 类 号：TE122.2[石油与天然气工程—油气勘探]