Abstract: Shenhua carbon capture and storage (CCS) project is China's first complete process coal-based CO2 capture and multi-layer injection CO2 storage demonstration project in deep saline aquifer with low porosity and low permeability. With Shenhua CCS project as an example, the time-lapse vertical seismic profile (VSP) technology is presented and monitoring results of CO2 storage is obtained. By means of 3 VSP observations before and after gas injection, high quality time-lapse VSP data are obtained. High-quality time-lapse VSP images are achieved by developing consistency processing, vector wave-field separation and multi-component imaging. The seismic response characteristics of VSP before and after gas injection are analyzed by depth domain calibration and multiple attribute interpretation. The range of CO2 underground migration is predicted to reach the expected monitoring target of the CCS project. This case study shows that the VSP monitoring technology is an effective method to monitor carbon dioxide geological storage and migration.

Key words: carbon capture and storage (CCS), time-lapse VSP, geological storage, multi-wave imaging