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GR calibration 
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Anulacp

Joined: Tue Jul 19, 2011 10:50 am
Posts: 3
Post GR calibration
How can I calibrate GR log (old-fashion Soviet curve) existing in counts/min or mkR/min to API units when only lithology of well (of given area) is known? No info about tool, any charts, etc. are available.
Tue Jul 26, 2011 7:26 am
JFerrera

Joined: Fri Oct 01, 2010 12:18 am
Posts: 3
Post Re: GR calibration
I guess you could always try to normalize and just take the maximum GR and translate that to a value of 150 (or 200 gAPI). Old sovjet curves usually range to 30, am I right? In sand-shale settings normalization could work quite well. Otherwise you might need to use other logs and find the shale base line to use for the normalization.
Tue Jun 12, 2012 8:12 pm
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