Petrospec Technologies

Normal Compaction Trend Worksheet

Linear Form:

Xnct = b + m * TVDbml

Logarithmic Form:

Xnct = 10^{(b + m * TVDbml)}

Exponential Form:

Xnct = Xmax + ( Xmin - Xmax ) * 10 ^{(c * TVDbml )}

Hyperbolic Form:

Xnct = (a + c * Xmax - TVDbml * Xmax) / (c - TVDbml)

Constants
Constant Name	Symbol	Value
Kelly Bushing / Air Gap	KB
Water Depth	WD
Log Value at Mud Line	Xmin
Log Value Maximum	Xmax
Log Value at Calibration Point	Xcal
Depth at Calibration Point	TVDcal
Linear Form
Logarithmic Form
Exponential Form
Hyperbolic Form