Borehole Drilling Curve Advice
Published on by Bosco Nsiimire, Hydrogeologist - Engineer in Academic
Which curve or VES is good for drilling?
Please see the attached images.
Please advise me how to make my decision.
Media
Taxonomy
- Borehole Drilling
- Hydrogeology
- Hydrogeophysics
- Drilling
- Drilling Machinery
3 Answers
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In my opinion both the red and blue curve are positive, the red curve I feel is better as it indicates a zone of low resistivity at deeper levels too around 60-80 m and this place woudl probably have an unconfined system at a depth of 8-20 m and a confined system at about 60-80 m. If it is a basement formation you probably will need to install casing down to 20 meters.
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The blue curve is smooth. If the curve is not smooth they are hard to interpret. The little bump in the curve at about 7 or 8 meters is likely the water table. Where the curve rises at the end is probably fresh basement.
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Assuming you are in a Basement formation I would go with the blue curve. It should be about 20 meters drilling depth.