Geo-science industries require reliable pieces of equipment to measure accurate and objective results in even the most demanding conditions. When it comes to your own work or project, you must invest in the most effective systems and machines to minimize costs and maximize the benefits. That’s where WTS geophysical borehole logging Equipment comes in.
WTS Instrument suppliers are a leading manufacturer of geophysical slim hole borehole logging systems for groundwater, mining, research, geotechnical, and other advantages – featuring a complete range of stackable wire line probes and rugged logging winches, versatile data loggers, and best-in-class Well CAD software.
The term logging is to make a record of something. The world of geophysical logging can take on many forms, including core-logging, cuttings-logging, petrophysical logging, and geophysical borehole logging. The aim of borehole logging is to determine the physical properties in either cased or uncased boreholes to know well the geology, fluid flow, and borehole integrity. Geophysical borehole probes or sounds measure natural gamma rays, electrical, acoustic, stimulated radioactive results, electromagnetic, nuclear magnetic resonance, pressure, and other attributes of the rocks and their contained fluids.
The below picture shows the aquifer mapping of a borehole,
Geoscience industries require reliable tools to ensure accurate and objective results in even the most demanding conditions. A standard borehole logging system includes a probe, winch, data logger, PC, and logging software. When it comes to your project, you must invest in the most effective systems to minimize costs and maximize the benefits.
Let us get to know some knowledge of the Geophysical borehole logging and its applications,
· Spontaneous Potential - Lithology, shale content, water quality
· Resistivity- Quantitative data on salinity of interstitial water; lithology
· Single-Point Resistance- High-resolution lithology, fracture location by the differential probe
· Natural Gamma- Lithology – may be related to clay and silt content and permeability; spectral identified radioisotopes
· Gamma-gamma- Bulk density, porosity, moisture content, lithology
· Acoustic Televiewer- Location, orientation, and character of fractures and solution openings, strike and dip of bedding, casing inspection
· Fluid Column Conductivity- Quality of borehole fluid, in-hole flow, location on contamination plumes.
· Flow- In-hole flow, location, and apparent hydraulic conductivity of permeable interval
· Caliper- Hole-diameter correction to other logs, lithology, fractures, hole volume for cementing
· Fluid Column Temperature- Geothermal gradient, in-hole flow, location of injected water, correction of other logs, curing cement.
· Sonic- Porosity, lithology, fracture location and character, cement bond.
Geotechnical logging can be done by the geologist or engineer either before or after geological borelogging. The primary aim of geotechnical logging is to obtain details that may be used to establish the engineering properties of the rock mass. The data gathered from geotechnical logging is of fundamental importance to provide data for mine design with regard to stability. Therefore, it is essential to collect data on all the geotechnical attributes that will increase the strength and performance of the rock mass.
Borehole logging systems are used to measure inside drill holes or boreholes with probes and sensors along with instrumentation, which transmits the data through a cable to record instruments on the circumference. The logging cable and probe are lowered down the hole via a drum with appropriate slip rings on its axis to travel the electrical signals from the moving line to the stationary logging system. The cable travels over a pulley with a depth encoder that gives the logging system details on the depth of the probe in the hole as it moves either down or up. A borehole report is a record or graph of the sensor output plotted on the horizontal axis versus depth on the vertical axis.