Page 144 - Origin and Prediction of Abnormal Formation Pressures

SMECTITE-ILLITE TRANSFORMATIONS 121

CONCLUSIONS

In conclusion, one may state that the montmorillonite-illite transformation may
contribute to or lead to abnormally high formation pressures. In many cases, however,
due to lack of potassium ions in the interstitial solutions, low geothermal gradients, etc.,
this may not be the case.
The montmorillonite/illite ratio, however, should be measured and used in conjunc-
tion with other predictive techniques in thick sand-shale sequences.

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