Predicting permeability of low-enthalpy geothermal reservoirs: A case study from the Upper Triassic – Lower Jurassic Gassum Formation, Norwegian–Danish Basin
| Autor: | Lars Kristensen, Henrik Friis, Claus Kjøller, Anders Mathiesen, Rikke Weibel, Mette Olivarius, Morten Leth Hjuler, Lars H. Nielsen |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Geochemistry engineering.material 010502 geochemistry & geophysics 01 natural sciences Diagenesis Sedimentary depositional environment Siderite chemistry.chemical_compound Pore-throat size distribution Porosity Geomorphology Ankerite Geothermal gradient 0105 earth and related environmental sciences Renewable Energy Sustainability and the Environment Burial depth Geology Geotechnical Engineering and Engineering Geology Depositional environment Grain size Permeability (earth sciences) chemistry Illite engineering Porosity–permeability trends |
| Zdroj: | Weibel, R, Olivarius, M, Kristensen, L, Friis, H, Hjuler, M L, Kjøller, C, Mathiesen, A & Nielsen, L H 2017, ' Predicting permeability of low enthalpy geothermal reservoirs: A case study from the Upper Triassic − Lower Jurassic Gassum Formation, Norwegian–Danish Basin. ', Geothermics, vol. 65, pp. 135-157 . https://doi.org/10.1016/j.geothermics.2016.09.003 |
| ISSN: | 0375-6505 |
| DOI: | 10.1016/j.geothermics.2016.09.003 |
| Popis: | This paper aims at improving the predictability of permeability in low enthalpy geothermal reser-voirs by investigating the effect of diagenesis on sandstone permeability. Applying the best fittedporosity–permeability trend lines, obtained from conventional core analysis, to log-interpreted poros-ity, is crucial in estimating reservoir permeability from logs. Petrographical analysis of sandstones fromthe Gassum Formation reveals lithological and diagenetic controls on plug permeability and porosity.Porosity–permeability trend lines vary with grain size for the shallowly buried sandstones (2500 m) from a steeply sloping porosity–permeability trend line since thepore-throat diminution due to quartz, ankerite and illite precipitation affects the permeability more thanporosity, as evident from mercury injection curves. Permeabilities lower than the general trend for eachgrain-size group are caused by early diagenetic siderite cement, late diagenetic illitic clays and/or detritalclays. Permeabilities of sandstones deposited under humid well-vegetated conditions in marine and par-alic environments, such as the Gassum Formation, are primarily dependent on burial history (maximumburial depth) and depositional environment. |
| Databáze: | OpenAIRE |
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