中国石油大学学报（自然科学版）2017，Vol.41Issue(6)：123-131,9.DOI:10.3969/j.issn.1673-5005.2017.06.015
油藏CO2驱及封存过程中地化反应特征及埋存效率
Geochemical reactions and CO2 storage efficiency during CO2 EOR process and subsequent storage
摘要
Abstract
Geochemical reactions among CO2-fromation water-rocks can occur and affect the physical properties of the reser-voir and the CO2 trapping mechanisms during CO2 EOR process. In this paper, based on the properties of the reservoir and fluids in a typical high-temperature oil reservoir in Jilin Oilfield, a comprehensive model was established to simulate the CO2 EOR and the subsequent storage, processes, in which formation water evaporation, dissolution and diffusion of CO2 in water, CO2-water-rock geochemical reactions and variations of porosity and permeability were considered. The geochemical reactions and various CO2 trapping forms in different stages were analyzed using the model, and the influences of different CO2 injec-tion methods on EOR and CO2 storage were evaluated. The results show that, though the geochemical reactions can change reservoir porosity and permeability, their effect is not significant and most of the injected CO2 can be trapped as supercritical gas during CO2 EOR process. During CO2 storage, gaseous CO2 can be continuously converted into mineral forms due to geo-chemical reactions, which results in a reduction of reservoir pressure. A WAG ( water alternative gas injection) method can be applied to enhance oil recovery and increase CO2 storage efficiency. Further injection of CO2 after CO2 EOR process can increase the CO2 storage capacity, and simultaneously maintain the reservoir pressure.关键词
高温油藏/CO2驱/CO2埋存/地化反应/埋存效率Key words
high-temperature oil reservoir/CO2 displacement/CO2 storage/geochemical reactions/storage efficiency分类
天文与地球科学引用本文复制引用
崔国栋,张亮,任韶然,章杨..油藏CO2驱及封存过程中地化反应特征及埋存效率[J].中国石油大学学报（自然科学版）,2017,41(6):123-131,9.基金项目
国家自然科学基金项目(51674282) （51674282）
中央高校基本科研业务费专项(17CX06006) （17CX06006）
中国石油大学(华东)研究生创新工程项目(YCX2017022) （华东）
"十三五"国家油气重大专项(2016ZX05056004-003) （2016ZX05056004-003）
