Subsurface Carbon Storage

Subsurface carbon storage (SCS) is the process of capturing carbon dioxide (CO2) from large stationary sources (e.g., coal-fired power plants and natural gas processing facilities) and storing it in the subsurface for extended time periods. SCS is being considered as a climate change mitigation option for near- and long-term scenarios.

For SCS to be an effective carbon emission reduction strategy, the injected CO2 needs to stay isolated from the atmosphere for thousands of years. In addition, injected CO2 must not degrade water supplies or cause negative geotechnical impacts.

To evaluate the feasibility and efficacy of SCS projects, complex modeling efforts are required to evaluate the fate, transport, and geochemistry of injected CO2, which includes compiling data generated by a suite of monitoring technologies (see figure below). HGL leverages a 35-year history of subsurface modeling to predict multiphase flow dynamics using optimized parameters for porosity, permeability, and geochemistry. HGL has specialized experience using artificial intelligence algorithms and machine learning along with computational optimization to support modeling of CO2 injection into the subsurface.

Monitoring Technologies Used to Detect Potential CO2 Leakage at Large-Scale U.S. Regional Carbon Sequestration Partnership Field Projects (after National Energy Technology Laboratory, 2017)