Heat flow in oligocene sediments at Szentendre
- 20 Downloads
In an exploration borehole of 500 m depth at Szentendre detailed geothermal measurements were made for the determination of the terrestrial heat flow. The hole crossed porous Oligocene sandstone containing clay minerals. 40 rock samples were collected but the cores lost a considerable part of their pore-water while taking ont of the borehole and transporting into the laboratory. Resaturation was not possible owing to desintegration of the samples due to swelling of clay minerals.
The author presents a method for overcoming this difficulty. It there exist a suitable model of pore distribution, the approximatein situ conductivity can be established. At first the rock specimen is completely dired out and the dry conductivity is measured. Then the specimen is saturated with some organic liquid or mineral oil with known conductivity and the conductivity is measured again. From these two values and from the conductivities of the air and liquid, with help of the pore structure model, thein situ conductivity can be approximated.
KeywordsSandstone Heat Flow Clay Mineral Oligocene Rock Sample
Unable to display preview. Download preview PDF.
- T. Boldizsár,Measurement of Terrestrial Heat Flow in the Coal Mining District of Komló, Acta Techn. Acad. Sci. Hung.15 (1956), 219.Google Scholar
- T. Boldizsár,Terrestrial heat flow in the Nagylengyel oil field, Publ. Min. Fac.XX (1959), 27.Google Scholar
- W. H. Diment andE. C. Robertson Temperature, thermal conductivity and heat flow in a drilled hole near Oak Ridge, Tennessee, J. Geophys. Res.68 (1963), 5035.Google Scholar
- Gy. Wein,Über die geologischen Verhältnisse der Umgebung von Szentendre, Földtani Közlöny69 (1939), 1.Google Scholar
- W. Woodside andJ. H. Messmer,Thermal conductivity of porous media, J. Appl. Phys.32 (1961), 1688.Google Scholar