Earth Tidal Analysis

GEOTHERMAL ENERGY

Exploration Technique: Earth Tidal Analysis

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• Activities (6)
• Areas (4)
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Exploration Technique Information
Exploration Group:	Downhole Techniques
Exploration Sub Group:	Well Testing Techniques
Parent Exploration Technique:	Well Testing Techniques
Information Provided by Technique
Lithology:	Enables estimation of in-situ reservoir elastic parameters.
Stratigraphic/Structural:
Hydrological:	Enables estimation of in-situ reservoir hydraulic parameters.
Thermal:

Earth Tidal Analysis:

Earth tidal analysis is the measurement of the impact of tidal and barometric fluctuations on effective pore volume in a porous reservoir.

Other definitions:Wikipedia Reegle

 

Use in Geothermal Exploration

• "Earth tidal analysis can be applied to a geothermal reservoir in order to estimate its elastic and hydraulic parameters. In order to collect these measurements in-situ, it is necessary to perturb the reservoir system out of equilibrium within the well in the vicinity of the pressure gauge.<br><br>

  Fluid pressure is traditionally perturbed using well pumping tests (fluid injection or production). However, earth tidal analysis enables the measurement of these reservoir parameters by taking advantage of minute pressure fluctuations due to tidal strain and barometric pressure.'"`UNIQ--ref-00000000-QINU`"'<br><br>

  Earth tidal analysis allows for the estimation of the in-situ porosity-total compressibility product and the permeability-thickness product of a geothermal reservoir.'"`UNIQ--ref-00000001-QINU`"'" cannot be used as a page name in this wiki.
• The given value was not understood.

Earth tidal analysis can be applied to a geothermal reservoir in order to estimate its elastic and hydraulic parameters. In order to collect these measurements in-situ, it is necessary to perturb the reservoir system out of equilibrium within the well in the vicinity of the pressure gauge.

Fluid pressure is traditionally perturbed using well pumping tests (fluid injection or production). However, earth tidal analysis enables the measurement of these reservoir parameters by taking advantage of minute pressure fluctuations due to tidal strain and barometric pressure.

Earth tidal analysis allows for the estimation of the in-situ porosity-total compressibility product and the permeability-thickness product of a geothermal reservoir.

 

Field Procedures

The given value was not understood.

Tidal strain-induced pressure response can be measured through the application of a multi-day recording of downhole pressure data at a specified sampling interval. In the Salton Sea Geothermal Field, downhole pressure was recorded for 660 hours at a sampling interval of 10 minutes. The downhole instrument used was a Paroscientific quartz pressure gauge which was suspended in a shut-in well at 100 feet below the water level.

 

References

Page	Area	Activity Start Date	Activity End Date	Reference Material
Earth Tidal Analysis At East Mesa Geothermal Area (1984)	East Mesa Geothermal Area	1984	1984	Interpretation of earth tide response of three deep, confined aquifers
Earth Tidal Analysis At Marysville Mountain Geothermal Area (1984)	Marysville Mountain Geothermal Area	1984	1984	Interpretation of earth tide response of three deep, confined aquifers
Earth Tidal Analysis At Raft River Geothermal Area (1980)	Raft River Geothermal Area	1980	1980	Reservoir response to tidal and barometric effects
Earth Tidal Analysis At Raft River Geothermal Area (1982)	Raft River Geothermal Area	1982	1982	Fracture orientation analysis by the solid earth tidal strain method Evaluation of subsurface fracture geometry using fluid pressure response to solid earth tidal strain
Earth Tidal Analysis At Raft River Geothermal Area (1984)	Raft River Geothermal Area	1984	1984	Interpretation of earth tide response of three deep, confined aquifers
Earth Tidal Analysis At Salton Sea Geothermal Area (1980)	Salton Sea Geothermal Area	1980	1980	Reservoir response to tidal and barometric effects

1. East Mesa Geothermal Area
2. Marysville Mountain Geothermal Area
3. Raft River Geothermal Area
4. Salton Sea Geothermal Area