Foad Haeri, Evgeniy M. Myshakin, Sean Sanguinito, Johnathan Moore, NETL Support Contractor; Dustin Crandall, Angela L. Goodman, National Energy Technology Laboratory
Sandstone and carbonate geologic formations represent attractive target reservoirs for permanent carbon dioxide (CO₂) storage. The U.S. Department of Energy National Energy Technology Laboratory (NETL) has developed the CO₂-SCREEN tool to utilize DOE-NETL CO₂ storage equations and numerically simulated efficiency factors to estimate CO₂ storage potential at the national and regional scales. In this work, time-dependent volumetric (E_v) and microscopic displacement (E_d) efficiency factors are reported using TOUGH3 models for 30 years of CO₂ injection. The E_v assesses the reservoir volume utilized under the areal plume, while E_d describes saturation values in the plume to evaluate efficiency of CO₂ storage in pore space. The factors were evaluated through a variety of scenarios based on parameters, such as pressure and temperature conditions, porosity, absolute permeability, permeability anisotropy, and injection rate. The estimated P10 and P90 ranges for the factors were calculated for various lithology and depositional environments utilizing the NETL’s CO₂BRA (https://edx.netl.doe.gov/hosting/CO₂bra) database that contains experimental relative permeability data for corresponding formations. Using publicly available well logs and core sample measurements from prospective injection sites, the effect of heterogeneous petrophysical properties on the efficiency factors was estimated. The results of this study will be incorporated in the CO₂-SCREEN tool (https://edx.netl.doe.gov/dataset/CO₂-screen) and made available to the public.