Borehole Drilling Curve Advice
Published on by Bosco Nsiimire, Technical Manager at KARSTBON ENGINEERING CONTRACTORS LTD 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.