Borehole

Surface

Depth prediction

Pore pressure prediction

Actual depth

Drilling judgment or calculated pressure

Depth error

(m)

Pressure error

Relative pressure error (%)

YCA

T30A

4534

2.09

4542

2.04

−8.00

0.05

2.45

YCB

T62A

5066

1.90

5068

1.84

−2.00

0.06

3.26