Radon And Carbon Dioxide Diffuse Soil Degassing At Ahuachapan Geothermal Field, El Salvador

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Conference Paper: Radon And Carbon Dioxide Diffuse Soil Degassing At Ahuachapan Geothermal Field, El Salvador

Abstract
The Ahuachapan Geothermal Field in El Salvador, Central America, has been in exploitation since 1975. Future expansion of the exploitation area towards the south and east is being considered. Several geoscientific studies have been conducted to evaluate the geothermal potential of this area. This paper reports the results of a survey of carbon dioxide soil fluxes and concentrations of radon in soil gases. Soil C02 flux measurements were performed using the accumulation chamber method and a LICOR LI-800 C02 Analyzer. 220Rn and 222Rn soil gas concentrations were measured with a portable radiation monitor Pylon Model AB-5 and a llOA Lucas Cell. 172 sampling points were measured. The obtained values ranged from 6 to 406 g.m'2.d-' for C02 flux with a background mean of 20 g.m-2.d-', from 2 to 132 pCi/l and 10 to 935 pCVl for radon and thoron, respectively. Peak levels of soil C02 flux, radon, and thoron concentrations were identified at the intersection of faults where hydrothermal fluids are rising and the rocks are highly fractured allowing the release of radon. Two areas were identified with the highest anomalies for C02 flux and radon and thoron soil gas concentrations. These areas are located between the Oriental (B) and San Jose Faults, and the zone between Los Amates, Oriental (B) Faults and a fault that is found close to the AH-35 well. These areas are proposed as good geothermal drilling targets

Authors 
Maria Inks Magaiial, Dina Lopez, Jose Tenorio and Antonio Matus








Published 
GRC, 2002





DOI 
Not Provided
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Citation

Maria Inks Magaiial,Dina Lopez,Jose Tenorio,Antonio Matus. 2002. Radon And Carbon Dioxide Diffuse Soil Degassing At Ahuachapan Geothermal Field, El Salvador. In: (!) ; (!) ; (!) . (!) : GRC; p. (!)