SECARB CO2 injection test in mature coalbed methane reservoirs of the Black Warrior Basin, Blue Creek Field, Alabama

Monitoring operations included multi-zone pressure logging and gas sampling in deep observation wells and groundwater sampling in a shallow observation well. Results indicate that significant permeability anisotropy exists in each coal group. In the Black Creek coal, pressure response was greatest in the dominant natural fracture direction. In the Pratt coal group, pressure response was dominated by hydrofractures. CO2 broke through to the observation wells only in the Pratt coal group and only along the major fracture directions. No significant flow of CO2 out of zone was detected, and no impact on shallow groundwater resources was identified.