期刊
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY
卷 6, 期 1, 页码 70-82出版社
WILEY PERIODICALS, INC
DOI: 10.1002/ghg.1537
关键词
simplified physics model; CO2 plume migration; storage efficiency; stratified aquifer
资金
- US Department of Energy National Energy Technology Laboratory [DE-FE0009051]
- Ohio Development Services Agency [D-13-02]
The extent of plume migration as injected CO2 displaces the native reservoir fluids is a crucial performance metric to ensure safe and effective geologic sequestration. In this paper, we develop and validate a simplified physics model for the outer extent of CO2-brine interface in a stratified aquifer-caprock system. This involves quantifying the total storage efficiency, which is defined as the product of the volumetric sweep and displacement efficiencies, based on simulations covering an extensive parameter space of different reservoir and caprock properties. We model CO2 injection into a 2-D radially symmetric brine-filled reservoir with vertical permeability variations that is in hydraulic communication with a caprock. Based on insights from a suite of detailed numerical simulations of our system, the most important terms in the simplified model for total storage efficiency involve the relative permeability model followed by integrated measures of reservoir heterogeneity. A relationship is established for the plume extent at the end of injection from the amount of CO2 injected and the storativity (porosity-thickness product) of the reservoir. (c) 2015 Society of Chemical Industry and John Wiley & Sons, Ltd
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