East Mesa Geothermal Area

GEOTHERMAL ENERGY

Area Overview

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Geothermal Area Profile

Location:	California
Exploration Region:	Gulf of California Rift Zone
GEA Development Phase:	Operational"Operational" is not in the list (Phase I - Resource Procurement and Identification, Phase II - Resource Exploration and Confirmation, Phase III - Permitting and Initial Development, Phase IV - Resource Production and Power Plant Construction) of allowed values for the "GEADevelopmentPhase" property.
Coordinates:	32° 47' 0.00", -115° 15' 0.00"

Resource Estimate

Mean Reservoir Temp:	170°C443.15 K <br />338 °F <br />797.67 °R <br />
Estimated Reservoir Volume:	35.6 km³35,600,000,000 m³ <br />46,563,042,036.4 yd³ <br />35,600,000,000,000 L <br />223,917,263,412 bbl(oil) <br />298,556,351,251.6 bbl(US) <br />
Mean Capacity:	115 MW115,000 kW <br />115,000,000 W <br />115,000,000,000 mW <br />0.115 GW <br />1.15e-4 TW <br />
USGS Mean Reservoir Temp:	355°C628.15 K <br />671 °F <br />1,130.67 °R <br />
USGS Estimated Reservoir Volume:	35 km³
USGS Mean Capacity:	203 MW

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History and Infrastructure

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Operating Power Plants: 6

GEM Resources II Geothermal Facility GEM Resources III Geothermal Facility Ormesa I Geothermal Facility Ormesa IE Geothermal Facility Ormesa IH Geothermal Facility Ormesa II Geothermal Facility

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Developing Power Projects: 0

No geothermal projects listed.

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Power Production Profile

Gross Production Capacity:	0.0e+0 MW0 kW <br />0 W <br />0 mW <br />0 GW <br />0 TW <br />
Net Production Capacity:	0.0e+0 MW0 kW <br />0 W <br />0 mW <br />0 GW <br />0 TW <br />
Owners  :	Ormat
Power Purchasers :
Other Uses:

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Regulatory and Environmental Issues

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Exploration History

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First Discovery Well

Completion Date:
Well Name:
Location:
Depth:
Initial Flow Rate:
Flow Test Comment:
Initial Temperature:

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Well Field Description

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Well Field Information

Development Area:	0.0e+0
Number of Production Wells:
Number of Injection Wells:
Number of Replacement Wells:
Average Temperature of Geofluid:	296 170°C443.15 K <br />338 °F <br />797.67 °R <br />
Sanyal Classification (Wellhead):	Low Temperature
Reservoir Temp (Geothermometry):
Reservoir Temp (Measured):
Sanyal Classification (Reservoir):
Depth to Top of Reservoir:	1500 m1.5 km <br />0.932 mi <br />4,921.26 ft <br />1,640.415 yd <br />
Depth to Bottom of Reservoir:	2500 m2.5 km <br />1.553 mi <br />8,202.1 ft <br />2,734.025 yd <br />
Average Depth to Reservoir:	2000 m2 km <br />1.243 mi <br />6,561.68 ft <br />2,187.22 yd <br />

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Geology of the Area

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Geologic Setting

Tectonic Setting:	Rift Zone
Controlling Structure:
Topographic Features:
Brophy Model:	Type D: Sedimentary-hosted, Volcanic-related Resource
Moeck-Beardsmore Play Type:	CV-2a: Plutonic - Recent or Active Volcanism, CV-2b: Plutonic - Inactive Volcanism, CV-3: Extensional Domain"CV-2a: Plutonic - Recent or Active Volcanism, CV-2b: Plutonic - Inactive Volcanism, CV-3: Extensional Domain" is not in the list (CV-1a: Magmatic - Extrusive, CV-1b: Magmatic - Intrusive, CV-2a: Plutonic - Recent or Active Volcanism, CV-2b: Plutonic - Inactive Volcanism, CV-3: Extensional Domain, CD-1: Intracratonic Basin, CD-2: Orogenic Belt, CD-3: Crystalline Rock - Basement) of allowed values for the "MoeckBeardsmoreType" property.

Geologic Features

Modern Geothermal Features:
Relict Geothermal Features:
Volcanic Age:	Pleistocene'"`UNIQ--ref-0000000E-QINU`"'
Host Rock Age:
Host Rock Lithology:	sandstone
Cap Rock Age:
Cap Rock Lithology:	shale'"`UNIQ--ref-0000000F-QINU`"'

The moderate-temperature, low-salinity, liquid-dominated East Mesa geothermal field is located in the Imperial Valley, southern California, about 110 miles east of the San Diego metropolitan area. This valley is part of the Salton trough- an actively developing structural depression that hosts a number of geothermal systems.

The subsurface stratigraphy at East Mesa is characterized mainly by complex interfingering of late Cenozoic Colorado River delta deposits. A shale caprock covers flow in dominantly sandstones of 120-150°C fluids whose migration is unaffected by faults in the region.

Heat Source

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known or inferred magmatic system

Geofluid Geochemistry

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Geochemistry

Salinity (low):	1500
Salinity (high):	6000
Salinity (average):	3750
Brine Constituents:
Water Resistivity:

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NEPA-Related Analyses (1)

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Below is a list of NEPA-related analyses that have been conducted in the area - and logged on OpenEI. To add an additional NEPA-related analysis, see the NEPA Database.

CSV

Document #	Analysis Type	Applicant	Application Date	Decision Date	Lead Agency	Development Phase(s)	Techniques
DOI-BLM-CA-067-2006-12	EA					Geothermal/Leasing

Exploration Activities (3)

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Below is a list of Exploration that have been conducted in the area - and cataloged on OpenEI. Add a new Exploration Activity

Page	Technique	Activity Start Date	Activity End Date	Reference Material
Earth Tidal Analysis At East Mesa Geothermal Area (1984)	Earth Tidal Analysis	1984	1984	Interpretation of earth tide response of three deep, confined aquifers
Tracer Testing At East Mesa Geothermal Area (1983)	Tracer Testing	1983	1983	Tracer Recovery and Mixing from Two Geothermal Injection-Backflow Studies
Tracer Testing At East Mesa Geothermal Area (1984)	Tracer Testing	1984	1984	Preferred methods of analysis for chemical tracers in moderate- and high-temperature geothermal environments

References

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List of existing Geothermal Resource Areas.

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