This command defines the table of horizon notes. Each horizon note is assigned a unique note number, name, description and processing options. These settings are user-definable and additional horizon notes can be added. The horizon definitions are stored in a file with a .HZN extension.
Horizon notes provide additional information about strata. To
assign horizon notes to strata, the strata should have a horizon
note attribute. The name of the horizon note attribute is defined
in this command at the bottom of the dialog. By default this name
is HORIZON, but may be changed. The horizon note from the
definition file is matched with the strata by looking up the strata
horizon note attribute value in the table. The attribute can be
either a number to match by horizon note or a string to match with
the horizon name. For example, a strata with an attribute HORIZON
and a numeric value of 16 would use Questionable Structure from the
table shown below. A strata with a HORIZON attribute of a string
value QST would also use the Questionable Structure.
Besides using horizon notes as additional strata descriptors, horizon notes are also applied to strata processing in routines such as Strata Isopach Maps. When reading in the drillholes, if a strata has a horizon note with the Thickness option off, then this strata data will not be used for thickness modeling of this strata. Likewise if a strata has a horizon note with the Elevation option off, then this data point will not be used for elevation modeling of this strata. An application of horizon notes could be with coal section data where you have strata thickness value but the elevation is unknown. In this case, the strata in these drillholes could have a horizon note with the Thickness on and the Elevation off.
Pulldown Menu Location: Drillhole
Keyboard Command: hordef