A New Method for Flow Path Identification and Continuous Observation of CO2 Containment

Gamma Ray Flow Path Visualization (GR-FPV) is a new, cost-effective method for monitoring CO2 injection and containment in carbon sequestration projects. Developed from analysis of the Illinois Basin – Decatur Project (IBDP), GR-FPV uses anomalies in natural gamma ray (GR) logs as indirect tracers of subsurface fluid migration. This approach is inspired by in situ recovery (ISR) mining techniques, where CO2 reacts with saline formation water to create a lixiviant that mobilizes uranium, altering GR readings.

GR-FPV enables high-resolution tracking of CO2 movement using standard well-logging tools, offering a passive, continuous monitoring solution. It provides a more affordable and practical alternative to time-lapse seismic imaging and supports real-time injection management and regulatory compliance. Data from IBDP’s CCS1 well supports GR-FPV’s reliability and effectiveness. The method holds promise for improving containment assurance, reducing costs, and supporting adaptive reservoir control, and the team invites collaboration for further development and field deployment.