San Jacinto geothermal field, Nicaragua

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San Jacinto geothermal field, Nicaragua
Phil White Sinclair Knight Merz Ltd Polaris
Energy Nicaragua S.A.
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San Jacinto location
N
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Tectonic setting
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San Jacinto thermal area
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Previous work
McBirney 1953 3 shallow wells
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McBirney fumarole, El Tizate
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Previous work
McBirney 1953 3 shallow wells Texas
Instruments 1969 - 1971 5 shallow wells UNDP
1973 OLADE 1970s 1980s
Intergeoterm S.A. 1992 - 1995 7 deep vertical
wells SJ1-SJ7
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Thermal features and deep wells in the San
Jacinto Tizate area
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San Jacinto 2 x 5MW back pressure plant installed
2005
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Elevation of the base of the conductive layer
from 3D resistivity model
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Geological map of the San Jacinto Tizate area
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Phase I drilling

• Four wells (3 production, 1 reinjection) were
  completed in 2007-2008

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Preparing to run FMI log in well SJ6-2
Phase I drilling

• Cuttings were collected and logged from all wells
  
• Core was taken from one well
• Formation image logging in SJ6-2 (612 - 1152m)
• Indicated steeply dipping, folded bedding
• Confirmed that most fractures are oriented close
  to N-S

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Lithologies and alteration in wells SJ9-1, SJ6-1
and SJ6-2
Phase I drilling - geology
Lithologies
Alteration
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Temperature profiles in completed wells (SJ9-2
and SJ10-1 are not fully heated)
Phase I drilling - temperatures
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SJ9-1 16.1 MW
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SJ9-2 1 MW
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SJ6-2 22.8 MW
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Well tracks, permeability and faults
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Well tracks, permeability, faults and intrusives
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Conceptual model cross section
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Phase II drilling (future)

• Reinjection wells
• Pad R (4 wells) Pad I (2 wells) SJ10-2?

• Production wells
• SJ9-3 Pad B Pad H Pad T SJ6-3

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Phase 2 possible production wells
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Phase II drilling (future)

• Reinjection wells
• Pad R (4 wells) Pad I (2 wells)
• Production wells
• SJ9-3 Pad B Pad H Pad T SJ6-3

• Western Sector

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Questions?

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Geological map of the San Jacinto Tizate area
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San Ignacio Rhyolites
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La Cruz volcanics scoria
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La Cruz volcanics ash with blocks and bombs
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Santa Clara lava flows
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Santa Clara lava
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Telica lavas and pyroclastics
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Telica lava
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El Apante Diorite
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El Apante Diorite
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El Chorro Formation sediments
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El Chorro Formation sediments
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Slump deposits (faulted)
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Slump deposits