Overview of geothermal surface exploration methods

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Titill: Overview of geothermal surface exploration methodsOverview of geothermal surface exploration methods
Höfundur: Ochieng, Leakey ; Geothermal Development Company Ltd. ; KenGen ; Jarðhitaskóli Háskóla Sameinuðu þjóðanna ; United Nations University ; United Nations University, Geothermal Training Programme
URI: http://hdl.handle.net/10802/12789
Útgefandi: United Nations University
Útgáfa: 2016
Ritröð: United Nations University., UNU Geothermal Training Programme, Iceland. Short Course ; SC-21
Efnisorð: Jarðhiti; Jarðhitaleit; Afríka
ISSN: 1670-794x
Tungumál: Enska
Tengd vefsíðuslóð: http://os.is/gogn/unu-gtp-sc/UNU-GTP-SC-21-0101.pdf
Tegund: Tímaritsgrein
Gegnir ID: 991008384969706886
Athugasemdir: Presented at Short Course X on Exploration for Geothermal Resources, organized by UNU-GTP, GDC and KenGen, at Lake Bogoria and Lake Naivasha, Kenya, Nov. 9-Dec. 1, 2015.
Útdráttur: Geothermal surface exploration invariably entails a multi-geoscientific process, which are holistically aimed at defining the geometry and characteristics of the geothermal system prior to drilling. The scientific disciplines commonly involved are geology, geochemistry, and geophysics. Geological approach generally aims at understanding the various lithologies, volcanological evolution, structural controls, and hydrological regimes of the system. Geophysical exploration helps in determining the geometry (shape, size and depth) of the heat sources, reservoir and cap rock. It also aims at imaging structures that are responsible for the geothermal system, and delineating the areal extent of the geothermal resource. The most commonly used geophysical methods are electromagnetic/electric, gravity, magnetics and seismics. These methods ultimately depend on the various intrinsic properties of rocks such as resistivity/electrical conductivity, density, magnetic susceptibility, elastic moduli/velocity respectively. Geochemical exploration relies mostly on sampling and analysis of water, steam and gas from the thermal manifestation in order to characterize the fluids, estimate equilibrium reservoir temperature, determine the origin, evaluate mixing scenarios, determine the suitability of the fluids for the intended use and locate recharge areas and direction of fluid flow. Additional geochemical studies entails soil diffuse degassing measurements aimed at identifying gas leakages that usually mimic active faults and structures.


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