ELECTRICAL RESISTIVITY TOMOGRAPHY FOR SUBSURFACE MONITORING THE CARBON DIOXIDE INJECTION: A PHYSICAL MODEL ON LABORATORY SCALE

• Main Author: Eksifa Larasati, Relia
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/81140
• Institution: Institut Teknologi Bandung

Burning fossil fuels increases greenhouse gas levels, mainly dominated by CO2 in the atmosphere, and the long-term effect will be global climate change. Therefore, CO2 capture and storage in subsurface formations is a promising approach to reduce the release of greenhouse gases in the atmosphere. CO2 gas is injected into underground rock layers, known as storage rock reservoir formations or carbon storage. CO2 storage reservoir rock formations consist of fluid-impermeable rock layers (caprock) and reservoir rock formations with high porosity and permeability. This CO2 storage formation has adequate requirements and capacity to store CO2 safely for a long period. Rock formations suitable for storing carbon dioxide must be deep enough not to contaminate the groundwater. Porous and permeable subsurface rocks, i.e., sandstone and limestone, with storage capacity and the ability to transmit fluids, especially CO2, are very suitable for CO2 injection. Monitoring CO2 injection underground needs to be carried out to ensure that the CO2 injected into the reservoir enters properly into the reservoir. An appropriate and efficient method based on subsurface resistivity measurement is Electrical Resistivity Tomography (ERT). The ERT can determine fluid movement in the reservoir or carbon storage during the CO2 injection. Some references show that ERT can detect CO2 in subsurface carbon storage. This research was conducted to determine whether CO2 monitoring using ERT can be carried out in the Indonesian field by conducting laboratory-scale trials using Indonesian sand. This research used samples of Patani Formation sand. Tomography measurements used the Wenner-Alpha, Wenner-Schlumberger, and Pole-Dipole configuration. This research will prove that ERT can monitor CO2 injection fluids in the subsurface on a laboratory scale.