Geologic Sequestration Training and Research (GSTR) -
Recovery Act: Risk Assessment and Monitoring of Stored CO2 in Organic Rocks Under Non-Equilibrium Conditions
Performer: Southern Illinois University
Project No: FE0002423
NETL is partnering with Southern Illinois University (SIU) to undertake a comprehensive study to understand the potential interactions between organic rocks and CO2. Interactions between various ranked coals (lignite, sub-bituminous, bituminous, and anthracite) or organic shale with CO2 are complex and not well understood. The fact that potential risks associated with their storage are seldom evaluated under plausible but extreme transient conditions poses a concern. Most risk assessments are typically accomplished under equilibrium conditions. However, under extreme non-equilibrium conditions (whether natural, seismic, or manmade) there are potential situations that could lead to the re-emission of CO2 stored in organic rocks. The possible interactions have not yet been studied in detail. In addition, SIU is attempting to evaluate how potential pressure and temperature variations, typically encountered under natural seismic conditions, can control the emission, adsorption, and absorption behavior of stored CO2.