Fluid Inclusion Studies Of The Berlin Geothermal Field, El Salvador

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Conference Paper: Fluid Inclusion Studies Of The Berlin Geothermal Field, El Salvador

Abstract
Fluid inclusion studies confirm that wells TR-5, TR-5B and TR-5C are near the inferred present location of the upflow region in the Berlin geothermal system where -300°C fluids are ascending through permeable caldera fault zones. The three wells did not show temperature reversals in the deep aquifer. Well TR-3 was drilled within the Berlin graben, near the eastern boundary of the geothermal resource. There, -300°C brines flow laterally along lithologic contacts toward the northwest, between -800 and -1000 m (msl). Below -1000 m (msl), however, cooler temperatures (~270°C) prevail based on fluid inclusion and borehole data. The temperature reversal is attributed to cooling of deep aquifer fluids either by conduction or mixing with cooler waters descending along permeable fault zones within the graben. The decline of temperatures toward well TR-14 confirms its location along the northern boundary of the Berlin geothermal resource. Both fluid inclusions and borehole surveys indicate lower temperatures (-250-260°C) at -1 500 m (msl) caused by conductive cooling of deep aquifer fluids or mixing with surface waters flow downward along faults. Fluid inclusion studies of TR-14 samples reveal a relict hydrothermal system with deep fluid temperature of -330°C and apparent salinity of -2,100-3,200 ppm chloride. This hotter regime in the northern portion of the field apparently is not related to the present Berlin geothermal system. Future production well drilling at Berlin should focus mainly south of the TR-5 area where the postulated upflow seems to be located. Wells should be designed to target permeable faults which channel -3OOOC brine at -1000 m (rnsl). On the other hand, near the eastern boundary of the geothermal resource wells may be drilled to tap hot brine

Authors 
Elizabeth C. de Henriquez and Maribel C. Zaide-Delfin








Published 
GRC, 2003





DOI 
Not Provided
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Citation

Elizabeth C. de Henriquez,Maribel C. Zaide-Delfin. 2003. Fluid Inclusion Studies Of The Berlin Geothermal Field, El Salvador. In: (!) ; (!) ; (!) . (!) : GRC; p. (!)