Page 131 - Origin and Prediction of Abnormal Formation Pressures

Geothermal gradient
Contents of various clay minerals, pore pressure gradient in shales, and geothermal gradient in the various oil and gas fields of Azerbaijan and the South Caspian
Pore pressure gradient
Basin (average values are shown in parentheses) (after Buryakovsky et al., 1995, table 4, p. 210)
Kaolinite C'CIkm) (MPa/m) Mixed-layer Chlorite 0.0135 Trace Trace-5 20 (3.8) 0.0146 Trace-5 Trace 15-20 (2.5) (17.5) 0.0171 Trace-5 Trace-15 10-35 (1) (6) (24) 0.0176 Trace Trace-10 10-15 (5) (12.5) 16.0 0.0176 Trace- 15 Trace-20 (10) (12)
Clay mineral content (%) Hydromica Montmorillonite 45-60 10-35 (51) 40 10-35 5-60 (24) 10-45 (28) 10-53 40-75 (23)

(24)
40
Island (41) 30-75 (49) (53)

TABLE 4-5 Area Bibieibat Gryazevaya Sopka Gyuneshli Bakhar Sangachaly-Duvanny-Bulla Kyurovdag, Karabagly