ANISOTROPIC GEOTHERMAL HOST ROCK? CASE STUDY OF NEVADO DEL RUIZ, COLOMBIA
- Key words
- Anisotropy, Colombia, metamorphic rocks, Nevado del Ruiz, ultrasonic waves
- Conference
- New Zealand Geothermal Workshop
- Year
- 2021
- Session
- Session 4.3 - Geophysics
- Paper number
- 97
Full text
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Abstract
To date, geothermal exploration at Nevado del Ruiz (NRV) volcano suggests that metamorphic formations are the possible hosts of a geothermal reservoir. Measurements of ultrasonic elastic waves on metamorphic rock samples collected from outcrops and the well Nereidas-1 at in-situ pressure conditions. We find that elastic wave anisotropic is influenced by foliation and vein hydrothermal alteration at all effective pressures of interest. The presence of elastic wave anisotropy is crucial to correct seismic travel times for earthquake location, seismic tomography, monitoring, and design of future geothermal boreholes.
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