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Importing checkshots making sure the depth and time indexes get correct (+/-) signs
Conventions for checkshot import MD, TVD or Z can be used as depth index.
•
MD refers to KB, and Z to MSL. TVD can be set to refer to KB, MSL, SRD (Seismic Reference Datum) or CRD (Checkshot Reference Datum). TWT can be set to refer to SRD or CRD •
In Petrel, by convention Z and TWT have NEGATIVE values in the underground, and MD and TVD have POSITIVE values in the underground •
The table below represent the uppermost part of the checkshot applied to the well to the right (KB=36m) •
MD (m)
TVDSS (m)
Z (m)
TWT (ms)
36.00
0.00
0.00
0.00
121.91
85.94
-85.94
-110.30
243.82
207.86
-207.86
-258.20
365.74
329.77
-329.77
-397.90
487.66
451.68
-451.68
-530.80
Note that when the Domain of the window is TWT the Z-axis refers to TWT values
Domain: TWT
Import checkshots dialog In this example the checkshots file to be imported have positive Z and TWT values. The options ”Negate Z values” and ”Negate time values” must be toggled on to make Petrel read the Z and TWT values as they were negative. •
By default the ”Negate Z values” and ”Negate time values” are toggled on in the Import checkshots dialog. •
Note that checkshots exported from Petrel will have negative Z and TWT values. Consequently importing checkshots exported from Petrel using default settings in the Import dialog will give be incorrect. •
QC the imported checkshots by displaying the well in a 3D window in TWT domain, and open the Checkshot spreadsheet to confirm that the Depth and Time indexes have correct signs. •
Note that the in Checkshot spreadsheet the TWT values are denoted with positive values in the underground