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Tectonic regime dependence on the thermal state in the central-northern Apennines, Italy
No full textRemote Sensing Techniques as a Tool for Geothermal Exploration: the Case Study of Blawan Ijen, East Java
No full textInferring hydro-geothermal parameters from advectively perturbed thermal logs
No full textWe present techniques to infer thermohydraulic
parameters from the analysis of underground
temperature data from boreholes. Two different cases are
analyzed: thermal data from artesian wells and from
boreholes drilled in unconfined aquifers. The former allow
the assessment of the formation temperature gradient and
the flow volume; the latter give estimates of the Darcy
velocity and, consequently, allow the inference of the
aquifer hydraulic conductivity. The analysis procedure
consists in matching thermal logs with analytical models
incorporating both heat and mass transfer. The thermohydraulic
parameters are obtained from the coefficients of
the advective models by means of the least-square fitting
method. Examples of applications are given for a set of
temperature logs from a geothermal area of northwestern
Italy. Preliminarily, thermal gradients and the correction
for the recent climate change were evaluated from thermal
data of boreholes with no evidence of advection. The
analysis of artesian boreholes gave high formation thermal
gradients, in agreement with those obtained from boreholes
with dominant conductive thermal regime. In boreholes
drilled in permeable formations, the models predicting the
temperature versus depth distribution resulted generally
less sensitive to geological noise and fitted the field data
better than the models based on the gradient analysis. If the
shape of the thermal profile is taken into account as a
qualitative descriptor of the type of flow, reliable estimates
of the flow components can be obtained
Orographic influence on the central-northern Italy climate from underground temperatures
No full text- …
