DC Resistivity Survey (Schlumberger Array)
Exploration Technique: DC Resistivity Survey (Schlumberger Array)
|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|
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. 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. 
• Substantial lengths of cable energized with current at high voltage present a safety hazard.
• The Schlumberger array is a labor-intensive survey because of the cable lengths required and the movement of the electrodes during the survey.
- (Keller, 1966) "Dipole Method for Deep Resistivity Studies"
- (Sharma, 1997) "Environmental and Engineering Geophysics"
- (EPA, 1993) "Use of Airborne, Surface, and Borehole Geophysical Techniques at Contaminated Sites"
- (UW-Madison, n.d.) "Introduction to Applied Geophysics"
- (Morrison and Gasperikova, 2012) "DC Resistivity and IP field systems, data processing and interpretation"