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Application of micro-seismic methods to geothermal exploration : examples from the Kenya Rift

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Titill: Application of micro-seismic methods to geothermal exploration : examples from the Kenya RiftApplication of micro-seismic methods to geothermal exploration : examples from the Kenya Rift
Höfundur: Geothermal Development Company Ltd. ; KenGen ; Jarðhitaskóli Háskóla Sameinuðu þjóðanna ; United Nations University ; United Nations University, Geothermal Training Programme ; Simiyu, Silas Masinde
URI: http://hdl.handle.net/10802/12854
Útgefandi: United Nations University
Útgáfa: 2016
Ritröð: United Nations University., UNU Geothermal Training Programme, Iceland. Short Course ; SC-21
Efnisorð: Jarðhiti; Jarðhitaleit; Kenía
ISSN: 1670-794x
Tungumál: Enska
Tengd vefsíðuslóð: http://os.is/gogn/unu-gtp-sc/UNU-GTP-SC-21-0406.pdf
Tegund: Tímaritsgrein
Gegnir ID: 001459805
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: Results from volcano-seismic studies of many geothermal fields show that they are possible resource-mapping tools for geothermal exploration and reservoir monitoring. They have been able to map the size and depth of possible shallow geothermal heat sources by analyzing data for seismic gaps, S-wave attenuation, reflected arrivals and converted waves. Analysis of shear wave split data for fracture density show high permeability areas that are potential targets for drilling high-producer wells. Variation of Vp/Vs ratios is related to reservoir fluid phases where low values are related to a decrease in P-wave velocity in the area with low pore pressure, high heat flow, fracturing and steam/gas saturation in the reservoir. High velocity ratios were found in the relatively liquid-saturated high-pressure fields that these ratios are useful tools for monitoring reservoirs under exploitation. The volcano-seismic approach can be useful as a stand alone tool for analyzing geothermal resource both at the exploration and exploitation stage that is cost effective in the long term


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