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The Ölkelduháls geothermal field : a combined analysis of resistivity tem soundings and down-hole data

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Titill: The Ölkelduháls geothermal field : a combined analysis of resistivity tem soundings and down-hole dataThe Ölkelduháls geothermal field : a combined analysis of resistivity tem soundings and down-hole data
Höfundur: Jarðhitaskóli Háskóla Sameinuðu þjóðanna ; Azimudin, Tafif
URI: http://hdl.handle.net/10802/23282
Útgefandi: United Nations University; Orkustofnun
Útgáfa: 1995
Ritröð: United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 1995:2
Efnisorð: Jarðhiti; Jarðhitarannsóknir; Ölkelduháls
ISSN: 1670-7427
Tungumál: Enska
Tengd vefsíðuslóð: http://www.os.is/gogn/unu-gtp-report/UNU-GTP-1995-02.pdf
Tegund: Bók
Gegnir ID: 001516341
Athugasemdir: Myndefni: kort, línurit, töflur.
Útdráttur: The Ölkelduháls high-temperature geothermal field is situated within the Hengill volcanic complex. Interpretation of TEM soundings indicates that it is associated with a highly resistive body (>50 m) below a conductive layer (<5 m) covering an area of about 20 km2. The resistivity distribution is generally divided into three layers, an upper layer of high resistivity (>50 m), a middle layer of very low resistivity (<10 m) and a lower layer of high resistivity (>20 m). The results of the TEM soundings were compared with those of Schlumberger soundings giving similar results, but demonstrating the better resolution and accuracy of the TEM data. In the winter 1994-1995, well ÖJ-1 was drilled as the first exploration well in the area. Several downhole geophysical measurements were conducted during and after drilling. Both TEM soundings and resistivity logs identified the top of the geothermal reservoir at 120 m. Porosity values obtained from geophysical log calculation and core analysis show good correlation. Analyses of well tests indicate three major feedzones at 820-827, 948-963 and 1000-1035 m. The permeability of this well is very high, especially of the bottom feedzone, with an estimated productivity index of about 0.8x10-11 m3/s bar.


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