咸水层CO_(2)残余埋存机理的微观数值模拟研究  

Croscopic numerical simulation study of CO_(2) residual storage mechanism in brackish water layer

作　　者：崔传智 李国强[1] 李静[1] 李安慧 CUI Chuanzhi;LI Guoqiang;LI Jing;LI Anhui(MOE Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum),Qingdao,Shandong 266580,China)

机构地区：[1]非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛266580

出　　处：《中国科技论文》2024年第1期1-7,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(51974343);国家科技重大专项(2016ZX05010-002-007)。

摘　　要：基于矿场岩心铸体电镜扫描图生成的二值化图片建立二维气液两相渗流模型,利用相场法研究微观条件下CO_(2)的赋存状态与埋存机理,并分析了储层润湿性、气液两相界面张力及地层水回流速度等因素对CO_(2)残余埋存效果的影响。结果表明:当地层水回流后,CO_(2)被大量封存下来,此时CO_(2)赋存状态主要以柱状、孤滴状和盲端状为主;地层水回流时的速度对于残余气饱和度影响较大,而储层润湿性与气液两相界面张力对于残余气饱和度影响较小。此研究对于从微观角度认识CO_(2)残余埋存机理具有指导意义。A two-dimensional gas-liquid two-phase seepage model was established based on the binarized images generated from the electron microscopy scans of the core casts at the mine site,and the influences of factors such as reservoir wettability,gas-liquid two-phase interfacial tension and formation water reflux rate on the effect of CO_(2) residual storage was analyzed using the phase field method.The results show that after the reflux of water,a large amount of CO_(2) is sequestered,and the CO_(2) storage state is mainly in the form of column,solitary drop and blind end.The speed of water reflux has a greater influence on the residual gas saturation,while reservoir wettability and gas-liquid interfacial tension have a smaller influence on the residual gas saturation.This study can contribute to the understanding the CO_(2) residual storage mechanism from a microscopic perspective.

关 键 词：咸水层 CO_(2)残余埋存 微观数值模拟 相场法 

分 类 号：TE34[石油与天然气工程—油气田开发工程]