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Algorithm of TOUGHREACT Links to FLAC3D

Yu Ziwang1,Zhang Yanjun1,2,Zhang Qing1,Xu Tianfu2   

  1. 1.College of Construction Engineering, Jilin University, Changchun130026, China;
    2.Key Laboratory of Groundwater Resources and Environment, Changchun130021, China
  • Received:2012-04-24 Online:2013-01-26 Published:2013-01-26

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Abstract:

THM coupling analysis in porous medium has an important research significance in geological sciences such as nuclear waste geological storage, hot dry rock, CO2 geological storage, etc.，in which numerical method is often required in view of its computational complexity. TOUGHREACT is joined together with FLAC3D using grid conversion between the corner points and center point as well as three dimension three point Lagrange interpolation methods, and realizes the multiphase and multicomponent fluid-temperature-rock mechanics coupling analysis. In order to verify the efficiency and applicability of the program, numerical model of CO2 sequestration into underground saline reservoir in Salah is founded, and three years continuous injection of CO2 is simulated. Fluid migration and reservoir, cap rock mechanics variation underground is evaluated, and the ground surface displacement is compared with measured values by inSAR. Then a further simulation of three-dimensional cylinder injection model of CO2 sequestration in a basin of West China is done. The applicability of the coupled program TOUGHREACT-FLAC3D is demonstrated. The results under the influence of mechanics on the injection pressure as well as the displacement of ground surface are reasonable and in a good agreement with the monitoring value, and some other mechanical results are also obtained.

Key words: THM coupling in porous medium, code research, TOUGHREACT-FLAC3D, numerical analysis, storage

CLC Number: 

  • TU458.3
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