Low-temperature hydrothermal activity in Iceland is
apparently mostly controlled by dikes and fractures.
Conventional methods of production data analysis are not
readily applicable in cases of heterogeneous/anisotropic
fracture dominated hydrothermal systems. Moreover, the
dikes and fractures may control the heat uptake mechanism
of low-temperature activity.
The free-surface response functions of...
The problem of downward continuation of potential fields is
being considered. The basic approach involves computation in real
space using a power series expansion. The computation of the derivatives
required for evaluating the series is carried out on the basis of
two approximation methods, viz. (1) polynomial method, and
(2)...
The displacement of the free liquid surface in geothermal and
hydrologic reservoirs is an important capacitance factor. An
iterative approach to determining the drawdown of the free liquid
surface for a single sink region in a homogeneous, isotropic, Darcy-type
porous mediums is discussed. The iterative approach involves a
stepwise adjustment...
The effects on the temperature microstructure of terrestrial heat flow and heat flow anomalies at the ocean floor are discussed on the basis of a simple heat diffusion model. The effects on the temperature microstructure of layering of the thermal properties of the ocean are investigated. This is done both...
The stability of fluids in porous media subject to
various physical and geometrical conditions is studied
here. Criteria for the onset of convective motions are
given in terms of critical temperature gradients or heat
sources. The general method used involves the linearization
of the field equations about the hydrostatic solutions...
A brief tilt and strain survey was conducted in the Krafla-Namafjall area in the North of Iceland during August of 1979 in order
to study the feasibility of applying solid earth tidal observations
in the exploration of volcanic geothermal systems. The rationale
of the survey was based on the expectation...
In this thesis, the interpretation and reduction of ocean heat
flow measurements are discussed on the basis of theoretical models.
The instrument effect x heat flow measurements is investigated for the
case of long period measurements by studying the heat conduction
along the measurement probe for both steady and unsteady...
Geothermal resources are characterized by a very low electrical
resistivity of the reservoir formations. The application of electrical
methods in the reconnaissance type exploration for such resources is
discussed. It is concluded that the magneto-telluric method is very
well suited for this purpose.
In 1971 and 1972 a reconnaissance type...
This thesis involves the interpretation of gravity and other
potential field anomalies caused by layers of varying thickness. The
partial differential equations of potential field theory are reviewed for
gravitational and magnetic force fields. A similar review is carried
out for steady-state heat transport and diffusion processes. For the
gravitational...
Two thermal convection problems of geophysical interest are
examined, theoretically. First, convection in the earth's mantle is
treated on the basis of a one-dimensional 'strip model'. This model
results from further simplification of the well known 'Rayleigh model'.
For homogeneous, Newtonian fluids, the strip model yields results
similar to those...