Data acquisition
The benefits of Borehole logging
- Provides information about the sub-surface that may be unobtainable from surface methods or sampling
- Measurements are made in situ
- Repeatable time lapse measurements to observe changes
- Continuous data, unlike sampling
- Only means of obtaining data when there is no information available
- Helps with the design and location of water wells
- Allows the vertical and horizontal extrapolation of data derived from boreholes
- Supplements geologists’ or drillers’ logs and geophysical surveys
- Key part in geotechnical, environment and exploration programmes
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Fluid logs
- Fluid temperature
- Electrical conductivity
- Flow
- pH
- Dissolved oxygen
- ORP
- Nitrate
- Sampler
USES
Identify inflows and outflows / Magnitude of flows / Water quality / Casing leaks
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Formation logs
- Resistivity – normal and focused
- Spontaneous potential
- Induction (conductivity)
- Natural gamma
- Spectral gamma
- Density (gamma – gamma)
- Neutron (porosity)
- Full-wave sonic
- Acoustic imager
- Optical imager
- Video
USES
Identification / Bed thickness / Porosity / Pore-water quality / Permeable zones
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High resolution imaging
Optical
Acoustic
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Construction logs
- Caliper
- Casing collar locator
- Casing corrosion
- Density
- Sonic bond
- Resistivity
- Video
- Verticality
USES
Diameters / Volume calculations / Stability / Cement bonding / Position and condition of casings / Location of gravel pack / Location of voiding / Borehole track / Visual inspection
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Video Surveys
Our range includes 38mm, dual side and forward 130mm plus other specialist video equipment for adits, shafts and mines.
LOG / Fluid / Open / Air / Cased / Screen