Coupled Flow and Deformation Modeling of Carbon Dioxide Migration in the Presence of a Caprock Fracture during Injection
Understanding the transport of carbon dioxide (CO2) during long-term CO2 injection into a typical geologic reservoir, such as a saline aquifer, could be complicated because of changes in geochemical, hydrogeological, and hydromechanical behavior. While the caprock layer overlying the target aquifer is intended to provide a tight, impermeable seal in securing injected CO2, the presence of geologic uncertainties, such as a caprock fracture or fault, may provide a channel for CO2 leakage. There could also be a possibility of the activation of a new or existing dormant fault or fracture, which could act as a leakage pathway. Such a leakage event during CO2 injection may lead to a different pressure and ground response over a period of time. In the present study, multiphase fluid flow simulations in porous media coupled with geomechanics were used to investigate the overburden geologic response and plume behavior during CO2 injection in the presence of a hypothetical permeable fractured zone in a caprock, exis...
Hema J. Siriwardane; Raj K. Gondle; Grant S. Bromhal
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