NUMERICAL MODELING AS A TOOL IN UNDERSTANDING TH (THERMO-HYDRODYNAMIC) PROCESSES IN GEOTHERMAL SYSTEMS (KAMCHATKA AND KURILE ISLANDS EXAMPLES)

摘要

Numerical modeling (TOUGH2) of the six Kamchatka and Kurile Islands geo-thermal fields (Paratunsky, North-Kurilsky, Malkinsky, Mutnovsky, Oceansky and Pauzhetsky), targeted to basic validation of conceptual models of fields through TH (thermo-hydrodynamic) processes understanding and estimations, including: 1. Natural thermal fluid upflow rate and enthalpy; 2. Space boundaries and permeability distributions in reservoir; 3. Hydro-dynamic boundary conditions of reservoir (for single-phase reservoirs); 4. Double-porosity properties of reservoir (two-phase reservoirs); 5.Forecast of different exploitation scenarios. In most cases numerical modeling of TH processes is an effective tool to estimate reservoir parameters mentioned above , if background conceptual models are properly defined. In some cases numerical modeling may be used as independent tool to understand permeability distributions and mass flows in geothermal systems .