RESISTIVITY CHANGES OF SANDSTONE RESERVOIRS DUE TO CO2 INJECTION IN SUBSURFACE FOR CARBON GAS STORAGE (CARBON CAPTURE STORAGE)

• Main Author: Lestari, Puji
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/81419
• Institution: Institut Teknologi Bandung

Carbon storage in subsurface reservoirs is considered one of the most effective methods to reduce the amount of carbon dioxide in the atmosphere with the aim of mitigating global climate change. Sandstone reservoirs are one of the potential candidates as carbon storage reservoirs because they have high porosity and are isolated by impermeable layers below the earth's surface. This study discusses the resistivity changes in sandstones in response to CO2 injection in sandstone reservoirs for subsurface carbon storage. Resistivity change is an important parameter for modeling and monitoring subsurface carbon storage processes. This experimental method involves a laboratory simulation that includes supercritical CO2 injection into sandstones and monitoring resistivity changes by geoelectric methods. CO2 was injected into sandstone core samples in a high-pressure hassler tube heated at a temperature range of 28 to 36 degrees Celsius. Supercritical CO2 was chosen because of its ability to mimic subsurface storage conditions at depths greater than 800 meters. Resistivity measurements were taken using a four- electrode geoelectric measuring instrument. The results showed an increase in sandstone resistivity during the injection process. This increase in resistivity is indicated by changes in the voltage and current values measured on the rock samples, suggesting changes in the physical properties of the rock associated with the uptake of CO2. These findings provide important insights into the interaction between supercritical CO2 and sandstones, and the implications for the potential for long-term storage of CO2 in sandstone formations. This research contributes to an in-depth understanding of CO2storage dynamics in sandstones, supporting the development of more effective and safe Carbon Capture Storage (CCS) technologies.