Simplified true vertical thickness (TVT) calculation
Smith, S.W.; Keen, D.C.
The Log Analyst 20(2): 28-32
Two simplified formulas are given for calculating true vertical thickness in updip and downdip condition. The formulas involve only three input values and are well within the limits of required accuracy of reservoir engineering determination where the base of the sand is relatively parallel to the top and the bore hole is not parallel to the bed dip.