WellCAD Basics - Advanced Logic Technology

398 - APPENDIX A
Point of
view
www.alt.lu
Borehole
Plane along selected
profile
To display a structure log in Slab core projection mode the log must have a caliper
value to work with. The effect of increasing the borehole diameter or caliper on a
given intersection line is to decrease its slope. Unless corrected this will give an
apparent decrease in the interpreted dip of the structure.
You can use a constant caliper value to work with (Fixed To) or select a Well Log
providing the necessary information from the Using Log drop down list.
Select the units of your caliper (mm or inches) by choosing one of the Caliper Unit
options.
When changing the caliper information you will be asked whether you want to
recalculate all dip angle values. If you choose Yes all dip data values will be changed.
If your selection is No, the data display changes according to the new caliper
settings.
The following sketch illustrates what the Slab Core projection style displays.
W
S
N
Slab core projection
E N
S
Intersection of dipping
plane and borehole
You can set a new profile orientation by changing the Azimuth value. See a preview
of your profile in the Slab Core pane.
You can change between a Full Size and a Fixed Size display of the Structure Log
data in Slab Core style while clicking on the appropriate radio button.
In Fixed Size style the length of the displayed intersection line is always set to 4/5
of the Structure Log column width.