Potential Assessment of CO2 Geological Storage in Geothermal Reservoirs Associated with Heat Mining Case Studies from China》.pdfVIP

Available online at ScienceDirect Energy Procedia 63 ( 2014 ) 7651 – 7662 GHGT-12 Potential Assessment of CO2 Geological Storage in Geothermal Reservoirs Associated with Heat Mining: Case Studies from China 1 1 2 1 1 1 Liang Zhang *, Dexiang Li , Bo Ren , Guodong Cui , Yuan Zhuang , Shaoran Ren 1. School of Petroleum Engineering, China University of Petroleum (huadong), Qingdao, China 266580 ;2. Department of Petroleum and Geosystems Engineering, University of Texas at Austin, USA 78712 Abstract Supercritical CO2 has good mobility and certain heat capacity, which can be used as an alternative of water for heat recovery from geothermal reservoirs, meanwhile trapping most of injected CO2 underground to achieve environmental benefits. In this paper, different types of geothermal resources are assessed to screen reservoirs suitable for geological storage and heat mining by CO2 injection, in terms of geological properties, heat characteristics, storage applicability, and development prospects, etc. Deep saline aquifer, geopressured reservoir and hot dry rock are selected as the potential sites, mainly due to their relatively positive geological conditions for CO2 circulation and storage. Reservoir simulations are conducted to analyze the storage efficiency and heat extracting capacity of CO2 in the promising geothermal reservoirs. A simple calculation method is presented to estimate the potentials of CO2 storage and heat mining in the major prospective geothermal regions of China. The preliminary assessment results show