Geophysical Well Logging Tool Water Well Logging Equipment Borehole Logging Equipment Geophysical Logger Logging
Geophysical well logging is a mature technology comprising many separate systems. It is well beyond scope of a short article like this to detail the science and the results of the many facets of geophysical well logging. What is intended here is just a short description of some of the more routine well logging methods. These methods are the ones most likely to be included in the suite of tools used for small well logging projects typical for regolith studies.
In geophysical well logging, many different physical properties can be used together to characterise the geology surrounding a borehole. This ability to sense various properties is the greatest strength of geophysical well logging. The different types of information obtained reflect on different aspects of the geology and are often complementary in nature. Thus the porous gravel bed of a palaeochannel, containing detrital maghemite, might have low density, low sonic velocity and natural gamma signal but high magnetic susceptibility and porosity.
Caliper Logging Geophysical Well Logging Tool Water Well Logging Equipment Borehole Logging System
1. A caliper tool is used to measure the diameter of a borehole and how it changes with depth. It typically works by using one or more spring-loaded arms, which are pressed against the borehole wall as the tool is raised from the bottom of the borehole. Motion in and out from the borehole wall is recorded electrically and transmitted to surface recording equipment.
ELECTRICAL METHODS
Geophysical Well Logging Tool Water Well Logging Equipment Borehole Logging System
Common electrical logs used in hard rock drilling include:
1. resistivity and conductivity;
2. spontaneous potential (SP),
3. induced polarisation (IP)
More geophysical logging tools as following:
| No. |
Name |
Parameters |
| 1 |
Resistivity and gamma |
SP, apparent resistivity, natural gamma |
| 2 |
Combined porbe |
16/64 resistivity, SP, natural gamma, temperature, SPR |
| 3 |
RES and IP |
16/64 resistivity, SP, IP |
| 4 |
Three component magnetometer |
Magnetic Tri-component |
| 5 |
Temperature and fluid resistivity |
Temperature, fluid resistivity |
| 6 |
Thee arm |
Diameter, liquid level |
| 7 |
Sonic |
Travel time, equation of time, amplitude |
| 8 |
Combined density |
Density, laterolog resisitivity, natural gamma, sp,caliper |
| 9 |
Neutron and gamma |
Natural gamma, porosity |
Geophysical Well Logging Tool Water Well Logging Equipment Borehole Logging System
Geophysical Well Logging Tool Water Well Logging Equipment Borehole Logging Equipment Geophysical Logger Logging
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