|
|
 Borehole
Geophysical Logging Services for Shallow Subsurface Applications
Complete suite
of borehole geophysical logging tools in a mobile vehicle.
Rapid and highly accurate subsurface characterization. Removes "subjectivity"
in wellsite geological descriptions. Allows through-casing surveying for
lithology and location of well seal. Modifications for environmental applications
include small diameter (1.8-inch diameter), use of short electrode spacing
(6-inch) for high resolution, and full control of natural gamma parameters
(time constant counting, differential correction, 8 to 12 feet per minute
logging speed).
- Natural Gamma
- Calibrated to an API standard or to ICON's span to match Unified Soils
Classification System; used to identify and correlate clay-rich zones
in open boreholes or through wells;
can be used to locate the bentonite seal in wells.
- 16 and 64-inch - Normal Resistivity - Used to locate water-bearing zones in open boreholes
and can be used to locate salt water impacted groundwater and to calculate
salinity; used for lithological correlation.
- Lateral Resistivity
- Single-Point
Resistance- Provides relative resistance readings in open boreholes,
and usually produces characteristic signatures that aid in cross-site
correlation.
- Caliper-
Guages borehole diameter to aid in proper well construction, and in
open boreholes can indicate more-cohesive clayey laminations within
loose silt sediments.
- Induction Conductivity
- Used for surveying lithology and brine impact through PVC wells.
- Spontaneous
Potential (SP) - Defines bed boundaries in open boreholes.
|
