Seismic Techniques

From Open Energy Information

Exploration Technique: Seismic Techniques

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Exploration Technique Information
Exploration Group: Geophysical Techniques
Exploration Sub Group: Seismic Techniques
Parent Exploration Technique: Geophysical Techniques
Information Provided by Technique
Lithology: Rock unit density influences elastic wave velocities.
Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc.
Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation.
Thermal: High temperatures and pressure impact the compressional and shear wave velocities.
Dictionary.png
Seismic Techniques:
Seismic methods provide information regarding the elastic properties of the subsurface through the measurement of the propagation velocity of elastic waves.
Other definitions:Wikipedia Reegle


 
Use in Geothermal Exploration
  • "Seismic techniques are used in geothermal exploration in a wide variety of applications, ranging from regional exploration for a heat source to determining locations of individual fractures.'"`UNIQ--ref-00000000-QINU`"' See Reflection Survey; Refraction Survey; Micro-Earthquake; [[Teleseismic-Seismic Monitoring" cannot be used as a page name in this wiki.
  • The given value was not understood.
Seismic techniques are used in geothermal exploration in a wide variety of applications, ranging from regional exploration for a heat source to determining locations of individual fractures.[1]

See Reflection Survey; Refraction Survey; Micro-Earthquake; Teleseismic-Seismic Monitoring


 
Physical Properties
The given value was not understood.
Seismic waves are classified as elastic waves because they cause nonpermanent deformation to the material through which they propagate. The characteristics of the deformation define the wave type.[2]

The fundamental wave types for seismic surveys are the p-wave (a.k.a. longitudinal, compressional) and the s-wave (a.k.a. transverse or shear). The particle movement of a p-wave is in the direction of wave travel and involves compression and expansion. For an s-wave, the particle movement is perpendicular to the direction of wave travel.
Compression and shear wave particle motion and direction of propagation.[3]


Velocity is the physical parameter measured by seismic techniques. Seismic waves propagate through a rock body at a velocity which is governed by the elastic properties (stress and strain, Young's modulus) and density of the geological formation.[2] Additional factors which influence compressional and shear wave velocities are lithology, extent of fractures, temperature, fluid content, saturation, and fluid pressure in the subsurface.[2][4]Empirical ranges of compressional and shear wave velocities through different lithologies are shown in the figure below.[5]

Typical rock velocities.[5]
Acoustic impedance contrasts are the ‘reflectors’ which are mapped using seismic techniques and may represent changes in lithology or discontinuous geological contacts. The acoustic impedance is defined as the product of the density and p-wave velocity within a rock unit. When an elastic wave encounters an acoustic impedance boundary, a portion of the wave energy is reflected off of the boundary and a portion is refracted into the second medium, according to Snell’s Law as depicted in the figure below.[4][6]

Behavior of a compressional elastic wave at an acoustic impedance boundary[7]




The given value was not understood.


No exploration activities found.



      Document #Analysis
      Type
      ApplicantGeothermal
      Area
      Lead
      Agency
      District
      Office
      Field
      Office
      Mineral
      Manager
      Surface
      Manager
      Development
      Phase(s)
      Techniques
      DOI-BLM-CA-670-2010-CXCXRam PowerBLM California State OfficeBLM California Desert District OfficeBLMGeothermal/ExplorationSeismic Techniques
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      DOI-BLM-NV-B020-2008-????-??Sierra Geothermal PowerReese River Geothermal AreaBureau of Land ManagementBLM Battle Mountain District OfficeGeothermal/ExplorationSeismic Techniques
      Thermal Gradient Holes
      DOI-BLM-NV-C010-2010-0008-CXCXTerra-Gen Power LLCDixie Meadows Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationSeismic Techniques
      DOI-BLM-NV-C010-2011-0004-CXCXAltaRock Energy IncDixie Valley Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementGeothermal/ExplorationSeismic Techniques
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      DOI-BLM-NV-CO1000-2010-0022-CXCXTerra-Gen Power LLCCoyote Canyon Geothermal AreaBLMBLM Carson City District OfficeBLM Stillwater Field OfficeBLMBLMGeothermal/ExplorationElectromagnetic Techniques
      Magnetotelluric Techniques
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      DOI-BLM-NV-W010-2010-0041-CXCXStephen D. MuirBrady Hot Springs Geothermal AreaBureau of Land ManagementBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationSeismic Techniques
      DOI-BLM-NV-W010-2010-0043-CXCXOski Energy LLCHot Pot Geothermal AreaBureau of Land ManagementBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationSeismic Techniques
      DOI-BLM-NV-W030-2010-0021-CXCXUS Geothermal IncSan Emidio Desert Geothermal AreaBureau of Land ManagementBLM Winnemucca District OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationSeismic Techniques
      DOI-BLM-NV-W030-2011-0007-CXCXUS Geothermal IncSan Emidio Desert Geothermal AreaBLMBLM Winnemucca District OfficeBLMBLMGeothermal/ExplorationSeismic Techniques
      DOI-BLM-OR-P000-2010-0003-EAEADavenport Power LLCNewberry Caldera Geothermal AreaBLMBLM Prineville District OfficeBLMUnited States Forest ServiceGeothermal/ExplorationWell Testing Techniques
      Drilling Techniques
      Exploration Drilling
      Seismic Techniques
      Passive Seismic Techniques
      NVN-084575CUVulcan Power CompanySalt Wells Geothermal AreaBLMBLM Carson City District OfficeBLM Stillwater Field OfficeGeothermal/ExplorationReflection Survey
      Seismic Techniques