ISSUES: Integrity of Gamma log

• ONWater’s Jens H.P. Norgaard has doubt on the gamma log collected @KSG007

• The doubtful depth is between 20 to 30m where there’s low reading and a high kick

• A rerun has been requested by ONWater without clear justification

• This PPT is a mean of discussion on the above issue

Gamma Log from TCGS & ELOG sonde collected@KSG007 and KSG008

TCGS SONDE LAYOUT

ELOG SONDE LAYOUT

1. Depth: 20 -30m(see the right-most column only)

Slide 6:Gamma log from TCGS sondeSlide 7: Gamma log from ELOG sonde

Gamma log data from KSG008 which is approx. 1.9km north of KSG007 is

being compared to show a possible geology similarity between them.

Data from KSG008

2. Depth: 13 -23m(see the right-most column only)

Slide 11:Gamma log from TCGS sondeSlide 12: Gamma log from ELOG sonde

•

Conclusion:

Both tools basically provide a reliable gamma log data. The anomaly observed is possibly that

of the subsurface and not of that of the tool and operators. A rerun wouldn’t be necessary

here.