SUBSURFACE CHARACTERIZATION FOR CO2 SEQUESTRATION IN FRACTURED SHALE RESERVOIRS

The research is focused on supercritical CO2 sequestration in geological porous media (oil bearing, and shale fracture reservoir). Because of intrinsically low permeability, sequestration in shales rock could help to mitigate leakage risks and infrastructure resources could be leveraged to minimize costs. The mechanism of gas trapping in shale gas is very similar to the coal formation. Gas is physically adsorbed in porous surface and moves with diffusive law, so shale gas reservoirs might be a target for CO2 storage. Shale is extracted through the fracking procedure and gas moves in fracture according to the Darcy�s law and desorbed according to the Fickean�s diffusive law. In fact, the sorption capacity and permeability are the two parameters for shale reservoirs with low permeable (0.001md to 0.1md). A detailed study has been carried out, including time lapse (4D) seismic modeling, CO2 saturation modeling, and elastic properties. The results show that the shale fracture reservoir is an ideal place for CO2 sequestration. Copyright© (2021) by the European Association of Geoscientists & Engineers (EAGE) All rights reserved.