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• W2110555194 abstract "After CO2 has been injected in the lower part of a dipping aquifer, it will continue to migrate, driven by buoyancy. This movement drives a countercurrent flow of brine leading to increased residual phase trapping. The purpose of this simulation study is to understand the effects of geomechanical structures, especially faults, on the dynamic behavior of the buoyancy-driven CO2 plume and the amount of residual trapping. Using GEM (Generalized Equation-of-State Model Compositional Reservoir Simulator) we studied the behavior of CO2 plumes (speed, direction, saturation at displacement front, residual phase trapping) in 2D formations with a range of fault properties (conductive vs. sealing, angle relative to dip, distance from initial plume location). We developed an analytical approach for estimating plume movement based on Buckley-Leverett theory, which compares favorably with the simulation results; thus, it can explain the basic behavior of CO2 plume in this simplified reservoir model, which is homogeneous, anisotropic and tilted. Smaller amounts of initially stored CO2 migrates shorter distances, and in these cases the simple theory predicts the plume movement prior to encountering a fault. If the plume encounters a fault within the reservoir, the fault can create new virtual source (CO2 build-up at the plume/fault intersection) for migration. It also leads to more complicated fluid movement, including counter current flow. A sealing fault, which acts as another boundary for CO2 plume, divides the aquifer into two parts: fault-independent zone and fault-dependent zone. The analytical solution can predict the properties of CO2 plume in the first zone, but not in the latter one due to the counter current flow. In both cases of a declined and an inclined fault, CO2 accumulates along the fault due to anisotropy causing dominantly parallel migration. The build-up continues until saturation approaches the endpoint dictated by the relative permeability curves (forming a virtual source), and then CO2 moves upward along the fault. On the other hand, a conductive fault, which acts as a new pathway for migration, may cause considerable leak of CO2 toward the top boundary of the reservoir (inclined fault) or increase the width of CO2 plume (declined fault). In the latter case of the conductive fault, the CO2 plume passes through larger area, which improves the efficiency of residual saturation trapping. To understand the dynamics of CO2 behavior, especially countercurrent flow, in the faulted reservoir we analyze flow vectors of both CO2 and brine phases, which explain the process of gas build-up and/or leakage due to structural" @default.
• W2110555194 created "2016-06-24" @default.
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• W2110555194 date "2007-01-01" @default.
• W2110555194 modified "2023-09-27" @default.
• W2110555194 title "Dynamics of CO 2 Plumes Encountering a Fault in a Reservoir" @default.
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