TIME-LAPSE REFLECTION SEISMIC MODELING FOR CO2 INJECTION MONITORING PROGRAMME: CASE STUDY AT OTWAY CCS PROJECT - AUSTRALIA

• Main Author: Hansen, Billy
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68484
• Institution: Institut Teknologi Bandung

Climate change and environmental issues has been one of the most alarming problems faced around the world in the 21st century. One of the proposed solutions is by reducing the anthropogenic carbon emissions released to the atmosphere. CCS and CCUS technologies are continuously being researched upon as means to reduce carbon emissions from the atmosphere by capturing carbon emissions and storing them in a geological formation underneath the earth. One of the famous CCS projects that have operated in Australia is the CO2CRC CCS Otway Project in Victoria, Australia, where 65.445-tonnes of CO2 had been injected to the Waarre Formation in Naylor Gas Field. Several types of monitoring programme are proposed to be evaluated, in order to estimate the CO2 plume evolution inside the reservoir. Time-lapse reflection seismic method could be implemented for monitoring the CO2 plume in the reservoir. However, before seismic survey is started, seismic modelling should be studied in the beginning to ensure that this proposed method can properly detect the existence of CO2 plume in the reservoir. In this project, NORSAR software is used for conducting seismic modeling and producing synthetic seismic data. The subsurface model and the estimated size of CO2 plume are obtained based on the available reports from CO2CRC. The assumptions that are used in this forward modeling are as follow: Noise-free, no multiples, and no attenuation. After the synthetic data is obtained, then the seismic data processing is carried out, both by using post-stack and pre-stack time migration methods. The ultimate goal of this research is to obtain the post-stack and pre-stack time migrated seismic sections and to see whether the CO2 plume is detectable. From this research stage, it could be concluded that the time-lapse reflection seismic method is possible to be implemented to the Otway CCS Project, since the existence of CO2 plume can be seen very clearly in the resulted seismic sections.