DC Resistivity Survey (Dipole-Dipole Array)

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Exploration Technique: DC Resistivity Survey (Dipole-Dipole Array)

Exploration Technique Information
Exploration Group: Geophysical Techniques
Exploration Sub Group: Electrical Techniques
Parent Exploration Technique: Electrical Profiling 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
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DC Resistivity Survey (Dipole-Dipole Array):
The Dipole-Dipole array is a type of electrode configuration for a Direct-Current Resistivity Survey and is defined by its electrode array geometry.
Other definitions:Wikipedia Reegle



 
Use in Geothermal Exploration
See also Direct-Current Resistivity Survey

The dipole-dipole resistivity survey has been applied towards reservoir delineation as well as resistivity monitoring of a producing geothermal field. Resistivity monitoring may be sensitive to fluid extraction from the reservoir, reinjection of cooler fluids, or porosity reduction resulting from calcite precipitation. [1]


 
Field Procedures
The dipole-dipole electrode array consists of two sets of electrodes, the current (source) and potential (receiver) electrodes. A dipole is a paired electrode set with the electrodes located relatively close to one another; if the electrode pair is widely spaced it is referred to as a bipole.[2] The convention for a dipole-dipole electrode array is to maintain an equal distance for both the current and the potential electrodes (spacing = a), with the distance between the current and potential electrodes as an integer multiple of a.[3] The electrodes do not need to be located along a common survey line. [4]

A primary advantage of the dipole-dipole electrode array is the ease of deployment in the field due to shorter wire lengths. However, a large generator may be needed to transmit a greater current magnitude for the measurement, especially for deep soundings. [5][2]

DC Resistivity electrode array: Dipole-Dipole configuration and apparent resistivity[3]



 
Potential Pitfalls











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