The use of Ahuachapan fluid chemistry to indicate natural state conditions and reservoir processes during exploitation

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:6668786

Treusdell, A H ^[1]; Aunzo, Z; Bodvarsson, G ^[2]; Alonso, J; Campos, A ^[3]

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1. Geological Survey, Menlo Park, CA (USA)
2. Lawrence Berkeley Lab., CA (USA)
3. Comision Ejecutiva Hidroelectrica del Rio Lempa (CEL) (El Salvador)

Chemical analyses of production fluids from Ahuachapan, El Salvador, have been used to indicate natural state reservoir fluid temperatures and chloride concentrations and reservoir processes resulting from exploitation. Geothermometer temperatures (Na--K--Ca and SiO{sub 2}) and calculated aquifer Cl for early flows show a gradient from about 265{degree}C and 9000 ppM Cl in the western part of the well field to 235{degree}C and 6000 ppM Cl in the eastern part. The geochemical temperatures are 10--20{degree}C higher than early downhole measurements. Since exploitation started, pressures have declined over most of the drilled area with boiling and excess-enthalpy discharges in the eastern and western parts. In the center of the field, a number of wells show mixing with cooler, less-saline water. These wells are nearly coincident with a major NE-SW oriented fault that may be the conduit for downward recharge of cooler fluids from an overlying aquifer. 12 refs., 9 figs., 1 tab.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: DOE/CE
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6668786
• Report Number(s): LBL-26870; CONF-890114-9; ON: DE90015718
• Resource Relation: Conference: 14. workshop on geothermal reservoir engineering, Stanford, CA (USA), 24-26 Jan 1989
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
AHUACHAPAN GEOTHERMAL FIELD
RESERVOIR FLUIDS
CHEMICAL ANALYSIS
TEMPERATURE MEASUREMENT
CHLORIDES
GEOTHERMOMETERS
CHLORINE COMPOUNDS
FLUIDS
GEOTHERMAL FIELDS
HALIDES
HALOGEN COMPOUNDS
MEASURING INSTRUMENTS
THERMOMETERS
Geothermal Legacy
152001* - Geothermal Data & Theory- Properties of Aqueous Solutions