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| Titel |
On the influence of advection on the “Guardia dei Lombardi" geothermal field |
| VerfasserIn |
Anozie Ebigbo, Jan Niederau, Gabriele Marquart, Gianluca Gola, Barbara Inversi, Davide Scrocca, Adele Manzella, Giordano Montegrossi |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099166
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| Publikation (Nr.) |
 EGU/EGU2014-14919.pdf |
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| Zusammenfassung |
| Due to local specific-heat-flow maxima of up to 90 mW/m2 and temperatures of
about 100 °C at less than 1.7 km depth, a southern Italian (Province of Avelino)
carbonate reservoir is being explored as a medium-enthalpy geothermal resource.
Hydrocarbon exploration wells and several seismic profiles within the chosen area (with
dimensions of 43 x 28 km) provide the basis for a complex, three-dimensional
geological model. The reservoir is faulted, anticlinal in structure, and overlain by dense,
partly clay-rich sedimentary layers. A hydraulic and thermal characterisation of the
geological units is possible through a combination of laboratory measurements,
literature sources, and well log data. Under the assumption of purely conductive heat
transport, the specific heat flow at the bottom of the reservoir (at 6 km depth) can be
estimated using temperature data from several boreholes in the region to 67 mW/m2
.
The goal of this study is the investigation of advective flow and the evaluation of its
influence on the temperature distribution in the reservoir. First hydrothermal simulation
models show a complicated flow structure in the anticlinal reservoir. But an inversion for
constant reservoir permeability based on the borehole-temperature observations results in a
relatively low value of 0.5 to 1 mD. However, pointwise comparisons between modelled and
measured temperatures show large differences. Thus, for an accurate inclusion
of regional flow processes and thermal convection, a proper representation of the
geometry of the anticlinal Apulian platform and a karstified, highly permeable
layer at the interface between the reservoir and its sedimentary cover is necessary.
Such a refined model will also lead to a recalibration of the specific basal heat flow. |
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