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Electric Logging

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Electric logging uses the marked differences in electrical properties between fine-grained sediments (shale, clay, and silt) and coarser-grained material (sandstone, sand, and gravel), to identify stratigraphic units from logs of electrical resistivity and natural electric potentials. Electric logging encompasses a number of specific techniques, including single-point resistance, spontaneous potential (SP), resistivity, and electromagnetic induction (EM). Single-point resistance simply involves measuring the bulk resistance between a surface electrode and the downhole probe

Electric logging uses the marked differences in electrical properties between fine-grained sediments (shale, clay, and silt) and coarser-grained material (sandstone, sand, and gravel), to identify stratigraphic units from logs of electrical resistivity and natural electric potentials. Electric logging encompasses a number of specific techniques, including single-point resistance, spontaneous potential (SP), resistivity, and electromagnetic induction (EM). Single-point resistance simply involves measuring the bulk resistance between a surface electrode and the downhole probe. Spontaneous potential measures natural voltages produced by electrochemical differences between sands, clays, and the borehole fluid. Resistivity uses a probe with four (or more) individual electrodes to measure the electrical resistivity of the formation surrounding the probe. EM logging yields conductivity (reciprocal of resistivity) by measuring the response to an induced electromagnetic field, thus permitting contamination levels to be determined through a plastic casing. The uses for these methods are many and varied, from identifying sands and gravels for screen placement, to determining water quality and locating contaminant plumes

Specification: Electric Logging

Probe
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Winch
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Drilling services
Hole Depth (m)

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Camera
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Drilling Rigs
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Hole Depth (m)

Inspection Service
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Hole Depth (m)

Inspection or Logging Service

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