Heat and mass transfer in a fault‐controlled geothermal reservoir charged at constant pressure

Goyal, K.P.; Narasimhan, T. N.

doi:10.1029/jb087ib10p08581

Cited by 6 publications

(8 citation statements)

References 19 publications

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“…For this reason we assume that the pressure gradient is orthogonal to the fault plane and that the fluids in the fault core move perpendicularly to the fault plane with a geometrically averaged velocity v. Moreover, to allow for an analytical approach we assume that fluid motion does not have a component in the direction of the fault plane. More sophisticated 2D numerical solutions for the fluid-and thermo-dynamical problem have been developed by Williams and Narasimhan (1989) for the study of the San Andreas fault and by Goyal and Narasimhan (1982) for the case of a fault-controlled geothermal reservoir charged at a constant pressure (1982). However these equations do not incorporate the effect of rate-, state-and temperature-dependent friction laws.…”

Section: The Temperature Evolution In the Case Of A Constant Fluid Vementioning

confidence: 99%

Effect of frictional heating and thermal advection on pre-seismic sliding: a numerical simulation using a rate-, state- and temperature-dependent friction law

Lorenzo

Loddo

2010

Journal of Geodynamics

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a b s t r a c tLaboratory experiments on simulated faults in rocks clearly show the temperature dependence of dynamic rock friction. Since rocks surrounding faults are permeable, we have developed a numerical method to describe the thermo-mechanical evolution of the pre-seismic sliding phase which takes into account both the rate-, state-and temperature-dependent friction law and the heat advection term in the energy equation. We consider a laminar fluid motion perpendicular to a vertical fault plane and assume that fluids move away from the fault plane. A semi-analytical temperature solution which accounts for the variability of slip velocity and stress on the fault has been found. This solution has been generalized to the case of a time varying fluid velocity and then was used to include the thermal pressurization effect. After discretizing the temperature solution, the evolution of the system is obtained by the solution of a system of first order differential equations which allows us to determine the evolution of slip, slip rate, friction coefficient, effective normal stress, temperature and fluid velocity. The numerical solutions are found using a Runge-Kutta method with an adaptative stepsize control in time. When the thermal pressurization effects can be neglected, the heat advection effect gives rise to a delay, with respect to the purely conductive case, of the earthquake occurrence time. This delay increases with increasing permeability H of the system. When the thermal pressurization effects are taken into account the situation is opposite, i.e. the onset of instability tends to precede that of the purely conductive case. The advance in the time of occurrence of instability increases with increasing coefficient of thermal pressurization. In the small permeability range (H ≤ 10 −18 m 2 ), the seismic moment and nucleation length of the pre-seismic phase are significantly smaller than those predicted by the purely conductive model.

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Section: The Temperature Evolution In the Case Of A Constant Fluid Vementioning

confidence: 99%

Effect of frictional heating and thermal advection on pre-seismic sliding: a numerical simulation using a rate-, state- and temperature-dependent friction law

Lorenzo

Loddo

2010

Journal of Geodynamics

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“…Numerical studies by Bodvarsson and Tsang (1981) have shown that this assumption is quite reasonable.…”

Section: Rock2mentioning

confidence: 99%

“…Goyal and Narasimhan (1981) have recently used a similar model for a constant pressure charging of a fault controlled geothermal reserovoir.…”

Section: General Backgroundmentioning

confidence: 99%

Theory of the development of geothermal systems charged by vertical faults

Bodvarsson¹,

Benson²,

Witherspoon³

1982

J. Geophys. Res.

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A two-dimensional model of fault-charged hydrothermal systems has been developed, that considers the transient development of such systems including the effects of heat losses to the confining layers. The model can be used for theoretical studies of the development of fault-charged reservoirs. It can also be used to estimate the rate of recharge from the fault source and the time of evolution, using temperature data from wells.The model has been applied to the hydrothermal system at Susanville, California. A reasonable match with the areal temperature distribution in the primary aquifer, and the temperature profiles of individual wells was obtained. This allowed an estimate of the recharge rate from the fault into the hydrothermal system to be obtained. As the calculated recharge rate (9 x lo-6 m3/s.m) into the Susanville hydrothermal system proved to be quite significant, a threefold increase in the potential of the Susanville hydrothermal anomaly for space heating purposes is predicted.

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“…The solution techniques involve boundary layer theory, numerical methods and a combination of perturbation methods. Kassoy and Zebib (1978) use the same basic solution techniques as Goyal and Narasimhan (1982), however, they consider only a fault zone. Pritchett and Garg (1979) studied a fault-charged reservoir by numerically simulating mass and energy transport in the aquifer, while neglecting bedrock heat losses.…”

Section: Fault-charged Modelmentioning

confidence: 99%

“…Several authors have studied the temperature distribution in fault-charged geothermal reservoirs, including Goyal and Narasimhan (1982), Goyal and Kassoy (1981).…”

Section: Fault-charged Modelmentioning

confidence: 99%

Heat and mass transfer in the Klamath Falls, Oregon, geothermal system

Prucha¹

1987

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Heat and mass transfer in a fault‐controlled geothermal reservoir charged at constant pressure

Cited by 6 publications

References 19 publications

Effect of frictional heating and thermal advection on pre-seismic sliding: a numerical simulation using a rate-, state- and temperature-dependent friction law

Effect of frictional heating and thermal advection on pre-seismic sliding: a numerical simulation using a rate-, state- and temperature-dependent friction law

Theory of the development of geothermal systems charged by vertical faults

Heat and mass transfer in the Klamath Falls, Oregon, geothermal system

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