Abstract
Many geothermal anomalies are intersected by vertical fault zones (narrow zones of fractured material with large effective permeability). These conduits are probably responsible for much of the upwelling of hot water from depth. This paper considers a shallow aquifer intersected by a vertical fault. The fluid flow in the aquifer is numerically modeled as a two-dimensional problem. It is observed that the temperature distribution in the aquifer is governed primarily by lateral flow of hot water supplied from the intersecting vertical fault and only secondarily by conduction. The numerical results also provide a possible explanation for the local temperature maxima and inversions occasionally observed in borehole measurements. The present model is an alternative to that based on mushroom-shaped isotherm distributions found in high Rayleigh number large-scale circulation cell calculations.
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References
Bories, S. A. andCombarnous, M. A. (1973),Natural convection in a sloping porous layer, J. Fluid Mech.57, 63.
Brownell, D. H., Jr., Garg, S. K. andPritchett, J. W. (1977),Governing equations for geothermal reservoirs, Water Resources Res.13, 929.
Donaldson, I. G. (1962),Temperature gradients in the upper layers of the earth's crust due to convective water flows, J. Geophys. Res.67, 3449.
Elder, J. W. (1967a),Steady free convection in a porous medium heated from below, J. Fluid Mech.27, 29.
Elder, J. W. (1967b),Transient convection in a porous medium, J. Fluid Mech.27, 609.
Garg, S. K., Pritchett, J. W., Rice, M. H. andRiney, T. D.,U.S. Gulf Coast Geopressured Geothermal Reservoir Simulation (Report No. SSS-R-77-3147, Systems, Science and Software, La Jolla, California, 1977), 116 pp.
Grindley, G. W.,The Geology, Structure and Exploitation of the Wairakei Geothermal Field, Taupo, New Zealand (Bulletin No. 75, New Zealand Geological Survey, 1965), 132 pp.
Kassoy, D. R. andZebib, A. (1977),Convection fluid dynamics in a model of a fault zone in the earth's crust, manuscript submitted to J. Fluid Mech.
Miller, R. E. (1977),A Galerkin, finite-element analysis of steady-state flow and heat transport in the shallow hydrothermal system in the East Mesa Area, Imperial Valley, Califorina, J. Res. U.S. Geol. Survey5, 497.
Norton, D.,Exploration Criteria for Low Permeability Geothermal Resources, (Report Under Contract No. EY-76-S-02-2763, University of Arizona, Tucson, Arizona, 1977), 186 pp.
Wooding, R. A. (1957),Steady state free thermal convection of liquid in a saturated permeable medium, J. Fluid. Mech.2, 273.
Wooding, R. A. (1963),Convection in a saturated porous medium at large Rayleigh or Peclet number, J. Fluid Mech.,15, 527.
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Pritchett, J.W., Garg, S.K. Flow in an aquifer charged with hot water from a fault zone. PAGEOPH 117, 309–320 (1978). https://doi.org/10.1007/BF00879756
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DOI: https://doi.org/10.1007/BF00879756