Question:
Which one of the following logging tools is used to measure the diameter of a borehole?
Which one of the following logging tools is used to measure the diameter of a borehole?
Show Hint
Remember: Caliper = \textbf{Cavity size}. Sonic, density, and neutron logs are formation evaluation tools, but only the caliper log measures the actual borehole diameter.
Updated On: Aug 22, 2025
- Sonic
- Density
- Neutron
- Caliper
Hide Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding borehole logging tools.
Different well-logging tools are designed for specific measurements: - Sonic log: Measures the travel time of sound waves in formations, used to calculate porosity and lithology.
- Density log: Uses gamma rays to measure electron density and formation bulk density.
- Neutron log: Measures hydrogen concentration, mainly used to estimate porosity.
- Caliper log: Directly measures the borehole diameter using mechanical arms or pads that expand to touch the borehole walls.
Step 2: Identify the tool for diameter measurement.
Among the given tools, only the caliper log physically measures the borehole size by detecting changes in borehole diameter (enlargements, washouts, or caving zones). Step 3: Conclusion.
Therefore, the correct logging tool to measure borehole diameter is the Caliper log. \[ \boxed{\text{Correct Tool: Caliper}} \]
Was this answer helpful?
0
0
Top Questions on Geophysical Well Logging
Questions Asked in GATE GG exam
- Rohit goes to a restaurant for lunch at about 1 PM. When he enters the restaurant, he notices that the hour and minute hands on the wall clock are exactly coinciding. After about an hour, when he leaves the restaurant, he notices that the clock hands are again exactly coinciding. How much time (in minutes) did Rohit spend at the restaurant?
- The sum of the following infinite series is: \[ 1 + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \frac{1}{4!} + \frac{1}{5!} + \dots \]
- GATE CH - 2025
- GATE BT - 2025
- GATE GG - 2025
- Sequence and Series
- A thin wire is used to construct all the edges of a cube of 1 m side by bending, cutting, and soldering the wire. If the wire is 12 m long, what is the minimum number of cuts required to construct the wire frame to form the cube?
A color model is shown in the figure with color codes: Yellow (Y), Magenta (M), Cyan (Cy), Red (R), Blue (Bl), Green (G), and Black (K). Which one of the following options displays the color codes that are consistent with the color model?
- Consider a two-dimensional reflection experiment, where a horizontal boundary between two layers is at a depth of 500 m below the free surface. A source and geophone are placed on the free surface with an offset of 2000 m. The P-wave velocity of the top layer is 3000 m/s. The travel time of a recorded free-surface reflection multiple, which got reflected twice at the free surface, is ________ s.
- GATE GG - 2025
- Seismology
View More Questions