Criteria for selecting sites for integrated CO_2 storage and geothermal energy recovery

摘要

One of the currently considered methods of reducing carbon dioxide emissions is the simultaneous storage of carbon dioxide (CCS) and production of geothermal energy accumulated in porous rocks (hydrothermal systems). The exploitation of geothermal heat and the storage of carbon dioxide are carried out in rock formations containing groundwater and lying at sufficient large depth.The selection of sites for combined heat recovery and CCS is a complex issue, conditioned by many different criteria. Currently, there are no established uniform criteria and method for selecting carbon dioxide storage sites. Also, in the case of geothermal installations recovering energy from waters found in sedimentary rocks, no special criteria for sites selection are used.The paper proposes the criteria for selecting geological structures in aquifer for the simultaneous recovery of geothermal energy and the storage of carbon dioxide (main goal). A set of 12 geological criteria was developed for this purpose. Based on the Analytical Hierarchy Process method, the importance of individual criteria was assessed. This assessment was made by pairwise comparison based on expert opinion of 10 decision makers. On this basis, the influence of individual factors on the main goal is estimated and an analysis of the order of occurrence of individual criteria in the aggregated ranking is made. (C) 2020 Elsevier Ltd. All rights reserved.