Engancing CO2 Inj ectivity in Higg-Salinity and Low-Permeability Aquifers：A Case Study of Jianggan Basin,Cgina
Fang Qi
Li Yilian
Cheng Peng
Yu Ying
Liu Danqing
Song Shaoyu
Abstract：Inj ectivity is a crucial technical and economical issue for CO2 geological storage proj ects due to large volumes of CO2 to be stored.Assessment and enhancement of CO2 inj ectivity in ubiquitous low-permeability reservoirs in the continental sedi-mentary basins of China is of great significance to the application and development of carbon capture and storage (CCS)in China.Numerical simulation was carried out to investigate the potential and enhancement of CO2 inj ectivity in high-salinity and low-permeability aquifers by taking Jiangling depression of Jianghan basin as the study area.The results show that pre-injection of freshwater and low-salinity saline water can effectively mitigate salt precipitation around the CO2 inj ection well at different levels;pre-inj ection of CO2-saturation solution and diluted HCl solution can significantly improve the porosity and permeability values and enhance CO2 inj ectivity.However,it is difficult to achieve a significant increase in CO2 inj ection rate in a short time due to the limited migration distance resulted from the low-permeability nature.Hydraulic fracturing measures can significantly increase CO2 inj ectivity and the improved capacity largely depends on fracturing half-length and fracturing degree.Therefore, for a single vertical well,it is possible to achieve the inj ection of hundreds of thousands of tons of CO2 per year to low-permeability reservoirs by adopting hydraulic fracturing measures and multi-layer inj ection.
Keywords：CO2 inj ectivityhigh salinitylow-permeability aquiferenhancement measurehydrogeology
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 1575-1583 )