Characterization of the shallow structure of El Tatio geothermal field in the Central Andes, Chile using transient electromagnetics

AbstractMultiplet analysis is based on the identification of seismic events with very similar waveforms which are used then to enhance seismological analysis e.g. by precise relocation of sources. In underground fluid injection conditions, it is a tool frequently used for imaging of subsurface fracture system. We identify over 150 repeatedly activated seismic sources within seismicity cluster induced by fluid injection in NW part of The Geysers geothermal field (California). Majority of multiple events (ME) occur along N–S oriented planar structure which we interpret as a fault plane. Remaining ME are distributed along structures interpreted as fractures, forming together a system of interconnected cracks enabling fluid migration. Temporal analysis reveals that during periods of relatively low fluid injection the proportion of ME to non-multiple events is higher than during periods of high injection. Moreover, ME which occur within the fault differ in activity rate and source properties from ME designating the fractures and non-multiple events. In this study we utilize observed differences between ME occurring within various structures and non-multiple events to describe hydraulic conditions within the reservoir. We show that spatial and temporal analysis of multiplets can be used for identification and characterization of dominant fluid migration paths.

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Pseudo-3D Characterization of a Geothermal Field through Magneto Telluric

Near Surface Geoscience 2012 – 18th European Meeting of Environmental and Engineering Geophysics ◽

10.3997/2214-4609.20143382 ◽

2012 ◽

Cited By ~ 1

Author(s):

C. Comina ◽

L.V. Socco ◽

A. Manzella

Keyword(s):

Geothermal Field

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Mineralogical characterization of silica sinters from the El Tatio geothermal field, Chile

American Mineralogist ◽

10.2138/am.2008.2583 ◽

2008 ◽

Vol 93 (8-9) ◽

pp. 1373-1383 ◽

Cited By ~ 21

Author(s):

M. Garcia-Valles ◽

J.L. Fernandez-Turiel ◽

D. Gimeno-Torrente ◽

J. Saavedra-Alonso ◽

S . Martinez-Manent

Keyword(s):

Geothermal Field ◽

Mineralogical Characterization

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Groundwater Chemistry and Overpressure Evidences in Cerro Prieto Geothermal Field

Geofluids ◽

10.1155/2017/2395730 ◽

2017 ◽

Vol 2017 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Ivan Morales-Arredondo ◽

María Aurora Armienta ◽

Nuria Segovia

Keyword(s):

Water Samples ◽

Evolutionary Process ◽

Geothermal Field ◽

Geological Characteristics ◽

Physical Chemical ◽

Geothermal Wells ◽

Cerro Prieto ◽

Diagenetic Evolution ◽

Brine Evolution

In order to understand the geological and hydrogeological processes influencing the hydrogeochemical behavior of the Cerro Prieto Geothermal Field (CP) aquifer, Mexico, a characterization of the water samples collected from geothermal wells was carried out. Different hydrochemical diagrams were used to evaluate brine evolution of the aquifer. To determine pressure conditions at depth, a calculation was performed using hydrostatic and lithostatic properties from CP, considering geological characteristics of the study area, and theoretical information about some basin environments. Groundwater shows hydrogeochemical and geological evidences of the diagenetic evolution that indicate overpressure conditions. Some physical, chemical, textural, and mineralogical properties reported in the lithological column from CP are explained understanding the evolutionary process of the sedimentary material that composes the aquifer.

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