Heat and Mass Transfer in a Fault-Controlled Geothermal Reservoir Charged at Constant Pressure

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A two-dimensional mathematical model of a fault controlled geothermal reservoir has been developed. Heated lighter water, rising in the fault, is assumed to charge a reservoir which, in turn, is overlain by a thin impermeable, thermally conducting cap rock. The mass flow rate or the pressure associated with the charging process at the fault inlet is unknown and can only be estimated. Thus, in this paper, the pressure in the fault at the bottom of the reservoir is assumed to be prescribed. Quasi-analytic solutions for the velocity, pressure, and temperature are obtained in the fault-reservoir system for a high Rayleigh ... continued below

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47 p.

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Goyal, K.P. & Narasimhan, T.N. December 1, 1981.

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Description

A two-dimensional mathematical model of a fault controlled geothermal reservoir has been developed. Heated lighter water, rising in the fault, is assumed to charge a reservoir which, in turn, is overlain by a thin impermeable, thermally conducting cap rock. The mass flow rate or the pressure associated with the charging process at the fault inlet is unknown and can only be estimated. Thus, in this paper, the pressure in the fault at the bottom of the reservoir is assumed to be prescribed. Quasi-analytic solutions for the velocity, pressure, and temperature are obtained in the fault-reservoir system for a high Rayleigh number flow. In this approximation, the upwelling fluid does not cool off appreciably until it reaches the cold upper boundary of the reservoir and encounters conductive heat loss. This thermal boundary layer, which is thin at the top of the fault, grows outward laterally and occupies the full thickness of the aquifer far away from the fault. The mathematical model is based on the flow of liquid water in a saturated porous medium. The solution techniques involve the combination of perturbation methods, boundary layer theory and numerical methods. The analysis of this generic model can be applied to liquid dominated geothermal systems where the thickness of the impermeable caprock is very small compared to the depth of the reservoir.

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47 p.

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  • 20h ASME/AIChe Heat Transfer Conference, Milwaukee, WI, August 2-5, 1981

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  • Report No.: LBL-11802
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1108736
  • Archival Resource Key: ark:/67531/metadc867732

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1981

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  • Sept. 16, 2016, 12:32 a.m.

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  • Sept. 29, 2017, 5:36 p.m.

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Goyal, K.P. & Narasimhan, T.N. Heat and Mass Transfer in a Fault-Controlled Geothermal Reservoir Charged at Constant Pressure, article, December 1, 1981; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc867732/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.