Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1493-1501.doi: 10.13278/j.cnki.jjuese.201505204

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Interaction of Rock-Brine-Supercritical CO2 in CO2-EGS Reservoir

Na Jin, Xu Tianfu, Wei Mingcong, Feng Bo, Bao Xinhua, Jiang Xue   

  1. College of Enviroment and Resources, Jilin University/Key Lab of Groundwater Resources and Environment, Ministry of Education, Changchun 130021, China
  • Received:2014-12-23 Published:2015-09-26

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Abstract:

Enhanced geothermal system (EGS) is an engineered reservoir that has been created to extract economical amounts of heat from geothermal resources with low permeability and/or porosity. CO2 enhanced geothermal system is a technology of geological storage of carbon with geothermal energy development. When the supercritical CO2 is injected into a deep reservoir, the surrounding rock will be dissolved or precipitated, and the porosity and permeability of the rock will also be changed. The interaction of rock-brine-supercritical CO2 in CO2-EGS was simulated by high-temperature & pressure reactor. The changes of ion compositions in the solution and scanning electron microscope of rock core showed that K-feldspar and calcite dissolved after the experiment, especially dissolution of calcite is too strong to be saturated. Meanwhile a very small amount of secondary calcite and albite were generated, with the generation of a new kind of mineral which is likely to be the intermediate product of siderite composed of C,O,Si, and Fe. The chemical reactions in the experiments were simulated by reactive transport modelling using TOUGHREACT. The information currently available by numerical simulations is generally consistent with the results from the laboratory experiment. This study provided geochemical evidences for chemical interaction mechanisms in CO2-EGS.

Key words: CO2-EGS, interaction of rock-brine-supercritical CO2, reactive transport simulations, hot dry rock, Songliao basin

CLC Number: 

  • P641

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