Page 168 - Origin and Prediction of Abnormal Formation Pressures
P. 168
Original Shale Pressure 1946 (Short Normal) Shale Pressure 1966 (Sigma Curve) .- Kick off Point Ib/gal MW-Maximu 10.2 needed to redrill well Formation Pressure, 1000 psi
- x---x 1966. (C) Original shale pressure from short normal log (1946) and
Ib/gal)
= 0.53 0.2 (1
G 40 50
30 20 Sigma Shale, C,, Fig. 5-1 1. PNC log used in quantitative formation pressure evaluation. (After Fertl and Timko, 1970.) (A) Shale resistivity plot in Tepetate field well, Louisiana,
Original Mud Weight 9.7 Iblgal Ortego A I 12.8 lWgal 14.0 = Homeseeken A 14.3 Iblgal Homeseeken B I 14.8 lbigal = Homeseeken C Homeseeken 0 14.9 Iblgal - 17.3 Iblgal - Twedel 17.6 Iblgal 2.0 drilled in 1946. (B) Sigma shale plot in the same well (cased) based on PNC log run in depleted shale pressur
Iblgal
1946 I .I. 'a 1 .O Shale Resistivity, R,,
Tepetate, LA (A1 0.5
- - 0.3
7,000 8.000
t * , A 5: Y c t Q a, 13
