Geophysical Techniques

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Exploration Technique: Geophysical Techniques

Exploration Technique Information
Exploration Group: Geophysical Techniques
Exploration Sub Group: None
Parent Exploration Technique: Exploration Techniques
Information Provided by Technique
Lithology: may be inferred
Stratigraphic/Structural: may be inferred
Hydrological: may be inferred
Thermal: may be inferred
Geophysical Techniques:
Geophysics is the study of the structure and composition of the earth's interior.
Other definitions:Wikipedia Reegle

Geophysical techniques measure physical phenomena of the earth such as gravity, magnetism, elastic waves, electrical and electromagnetic waves. These physical phenomena are sensitive to subsurface physical properties such as density, magnetic susceptibility, seismic wave velocity, electrical resistivity and permittivity. There are both passive- and active-source techniques for data acquisition.

Geophysical data may be presented as an earth model of a specified physical property in order to allow an inference of lithology, stratigraphy/structure, hydrogeology or thermal properties of the subsurface.
Use in Geothermal Exploration
Geophysical techniques are used in geothermal exploration to locate, characterize and monitor geothermal systems. Features of a geothermal reservoir such as structural constraints, reservoir geometry, fluid saturation, fracture network and depth to the reservoir may be interpreted from the integration of geophysical datasets.

The ultimate aim of geophysical exploration for geothermal systems is to locate drilling targets or monitor the production of a geothermal reservoir.

Environmental Mitigation Measures
Geophysical surveys are non- or minimally-invasive techniques applied to improve the understanding of the subsurface. The potential environmental impacts are related to the amount of field equipment required, the number of people needed for acquisition on the field crews, the means of access to the stations of measurement, the source of the signal for the measurement, time duration of occupancy of the measurement station, and the survey design, among others.

Best Practices
Survey design parameters such as line and station spacing should be sufficient to characterize spatial distribution of anticipated anomalies.[1]
Potential Pitfalls
Geophysical models are generally non-unique and ambiguous for a single technique. Integration of multiple geophysical data sets is essential for the successful interpretation of geophysical data. [2]


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