Analyses of permeability and porosity of sedimentary rocks in terms of unconventional geothermal resource explorations in Poland
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Date
2016-08
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Publisher
Instytut Geologii UAM
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Abstract
Petrophysical investigations are fundamental to natural resource exploration. In order to recognise the geothermal
potential of sedimentary rocks in central Poland, 259 samples were collected from prospective deep-lying geothermal
reservoirs. Parameters measured include bulk density, skeletal density, effective porosity, permeability, average pore
diameter and specific surface. Results indicate that at great depths (mostly > 3,000 m below surface) sedimentary rocks
show low values of porosity (mainly less than 5%) and permeability (only sporadically in excess of 1 md). These values
call for a petrothermal use of reservoirs, for which an Enhanced Geothermal System (EGS) was developed. Reser-
voirs suited for the EGS are Carboniferous and Lower Triassic sandstones in the central part of Poland (Mogilno-Łódź
Trough region and a small part of the Kujawy Swell and Fore-Sudetic regions). In addition, Carboniferous limestones
in this area are potentially prospective.
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Keywords
petrophysical parameters, geothermal energy, Enhanced Geothermal Systems, central Europe
Citation
Geologos, 2016, 22, 2,pp.149-163
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ISBN
ISBN 978-83-232187-4-6
ISSN
ISSN 1426-8981