The Ahuachapan geothermal field, El Salvador: Reservoir analysis

Technical Report · Tue Aug 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5505899· OSTI ID:5505899

Aunzo, Z; Bodvarsson, G S; Laky, C; Lippmann, M J; Steingrimsson, B; Truesdell, A H; Witherspoon, P A ^[1]

---

1. Lawrence Berkeley Lab., CA (USA)

The Earth Sciences Division of Lawrence Berkeley Laboratory (LBL) is conducting a reservoir evaluation study of the Ahuachapan geothermal field in El Salvador. This work is being performed in cooperation with the Comision Ejecutiva Hidroelectrica del Rio Lempa (CEL) and the Los Alamos National Laboratory (LANL). This report describes the work done during the first year of the study (FY 1988--89), and includes the (1) development of geological and conceptual models of the field, (2) evaluation of the initial thermodynamic and chemical conditions and their changes during exploitation, (3) evaluation of interference test data and the observed reservoir pressure decline, and (4) the development of a natural state model for the field. The geological model of the field indicates that there are seven (7) major and five (5) minor faults that control the fluid movement in the Ahuachapan area. Some of the faults act as a barrier to flow as indicated by large temperature declines towards the north and west. Other faults act as preferential pathways to flow. The Ahuachapan Andesites provide good horizontal permeability to flow and provide most of the fluids to the wells. The underlying Older Agglomerates also contribute to well production, but considerably less than the Andesites. 84 refs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: AID; DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5505899
• Report Number(s): LBL-26612-Vol.1; ON: DE90003119
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150900* -- Geothermal Engineering
AHUACHAPAN GEOTHERMAL FIELD
CENTRAL AMERICA
CHEMICAL ANALYSIS
CHEMICAL PROPERTIES
CHEMISTRY
DEVELOPING COUNTRIES
EL SALVADOR
ENERGY
ENERGY SOURCES
ENGINEERING
EVALUATION
EXPLORATION
FLUIDS
GEOTHERMAL ENERGY
GEOTHERMAL FIELDS
GEOTHERMAL FLUIDS
GEOTHERMAL RESOURCES
Geothermal Legacy
LATIN AMERICA
MINERALOGY
PRESSURE MEASUREMENT
RENEWABLE ENERGY SOURCES
RESERVOIR ENGINEERING
RESERVOIR TEMPERATURE
RESOURCES
WATER CHEMISTRY
WELL LOGGING