Oguni Geothermal Field

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Area Overview

Geothermal Area Profile

Location: Yamagata Prefecture, Japan

Exploration Region: Japan

GEA Development Phase: Operational
"Operational" is not in the list of possible values (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) for this property.

Coordinates: 39.5000°, -98.3500°

Resource Estimate

Mean Reservoir Temp: 202°C
475.15 K
395.6 °F
855.27 °R

Estimated Reservoir Volume:

Mean Capacity: 2 MW
2,000 kW
2,000,000 W
2,000,000,000 mW
0.002 GW
2.0e-6 TW

USGS Mean Reservoir Temp:

USGS Estimated Reservoir Volume:

USGS Mean Capacity:

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History and Infrastructure

Operating Power Plants: 1

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Developing Power Projects: 0

No geothermal projects listed.

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Power Production Profile

Gross Production Capacity:

Net Production Capacity:

Owners  :
  • Keiyo Plant Engineering Co
  • Waita Geothermal Power Plant
  • Chuo Electric Power Co

Power Purchasers :
  • Toshiba

Other Uses:

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Regulatory and Environmental Issues

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Exploration History

First Discovery Well

Completion Date:

Well Name:



Initial Flow Rate:

Flow Test Comment:

Initial Temperature:

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Well Field Description

Well Field Information

Development Area:

Number of Production Wells:

Number of Injection Wells:

Number of Replacement Wells:

Average Temperature of Geofluid:

Sanyal Classification (Wellhead):

Reservoir Temp (Geothermometry):

Reservoir Temp (Measured):

Sanyal Classification (Reservoir):

Depth to Top of Reservoir: 500m
0.5 km
0.311 mi
1,640.42 ft
546.805 yd

Depth to Bottom of Reservoir: 1950m
1.95 km
1.212 mi
6,397.638 ft
2,132.54 yd

Average Depth to Reservoir: 1225m
1.225 km
0.761 mi
4,019.029 ft
1,339.672 yd

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Geology of the Area

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Geofluid Geochemistry


Salinity (low):

Salinity (high):

Salinity (average):

Brine Constituents:

Water Resistivity:

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NEPA-Related Analyses (0)

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 No NEPA-related documents listed.

Exploration Activities (0)

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

No exploration activities listed on OpenEI.


  1. 1.0 1.1 1.2 1.3 Henry J. Ramey, Jr., Roland N. Horne, Paul Kruger, Frank G. Miller, William E. Brigham, Jean W. Cook. 1993. Proceedings- 18th workshop geothermal reservoir engineering. Stanford, CA: 18th Workshop Geothermal Reservoir Engineering. Report No.: SGP- TR-145.
  2. Benjamin Matek. Geo-energy [Internet]. Geothermal Energy Association. [updated 2015/04/28;cited 2015/04/28]. Available from: http://geo-energy.org/

List of existing Geothermal Resource Areas.