DC Resistivity Survey (Schlumberger Array)
From Open Energy Information
Exploration Technique: DC Resistivity Survey (Schlumberger Array)
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Field Procedures
| Exploration Technique Information | |
|---|---|
| Exploration Group: | Geophysical Techniques |
| Exploration Sub Group: | Electrical Techniques |
| Parent Exploration Technique: | Vertical Electrical Sounding Configurations |
| Information Provided by Technique | |
| Lithology: | Rock composition, mineral and clay content |
| Stratigraphic/Structural: | Detection of permeable pathways, fracture zones, faults |
| Hydrological: | Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water |
| Thermal: | Resistivity influenced by temperature |
DC Resistivity Survey (Schlumberger Array):
The Schlumberger array is a type of electrode configuration for a DC resistivity survey and is defined by its electrode array geometry.
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The Schlumberger array consists of four collinear electrodes. The outer two electrodes are current (source) electrodes and the inner two electrodes are the potential (receiver) electrodes. The potential electrodes are installed at the center of the electrode array with a small separation, typically less than one fifth of the spacing between the current electrodes. The current electrodes are increased to a greater separation during the survey while the potential electrodes remain in the same position until the observed voltage becomes too small to measure. Typically, expanding the current electrodes occurs roughly six times per decade. [1][2] The advantages of the Schlumberger array are that fewer electrodes need to be moved for each sounding and the cable length for the potential electrodes is shorter. Schlumberger soundings generally have better resolution, greater probing depth, and less time-consuming field deployment than the Wenner array.[3] The disadvantages are that long current electrode cables are required, the recording instrument needs to be very sensitive, and the array may be difficult or confusing to coordinate amongst the field crew. [4]
Schlumberger array and apparent resistivity[5]
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