Posted TD is the deepest Total Depth of any operation conducted on a well, adjusted for True Vertical Depth (TVD).
For Deviated Holes (horizontal and directional wells), the value has been corrected to True Vertical Depth (TVD).
The value is determined by comparing Total Depth values in the Event Header(s), and the Pick TVD values in the Strat Picks Subtable.
Posted TD is the Total Depth value that is posted by the IGS on maps showing total depths of wells.