Description

Values of depth that are dummy values are flagged.

Values of depth less than the defined hole top depth are flagged.

This error is reported just once per hole in any single database.

Values of depth greater than the defined hole bottom depth are flagged. The hole bottom depth is automatically reset to the maximum hole depth defined in the survey.

This error is reported just once per hole in any single database.

Duplicated depth values are flagged. Only one dip-azimuth value can be defined at a single depth.

Depths that decrease from the previous value are flagged. Depths should increase. Out-of-sequence depths may indicate an error in the depth values. In practice, depths are sorted before the hole is re-surveyed.

Flags dip or azimuth values which are undefined. The last dip and azimuth for a hole may be left undefined (dummy).

Dips outside this range (which are not dummies) are flagged. On import, dummy dips are set to 90 or –90, depending on the defined dip sign convention.

Azimuths outside this range (which are not dummies) are flagged. On import, dummy azimuth values are set to 0.

If a dip value has the opposite sign of the current dip convention, it is flagged. This would indicate a hole heading back to the surface.

One indication of erroneous depth, dip or azimuth values is the "creation" of a hole that bends crazily at a certain location. Curvature is the mathematical description of how fast the borehole bends. If this value is left blank, or zero, no check is performed. A maximum of 10 degrees per meter means that it would be okay if the hole could be formed into a circle with a circumference of 36 meters.