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Exploration for and the development of oil and gas fields in zones of abnormally high formation pressures (AHFP) require a good understanding of the origin of AHFP and the development of predictive methods. We classify the causes of AHFP into two genetic groups: (1) a syn-sedimentary group characterized by undercompaction of rocks and (2) a post-sedimentary group characterized by secondary decompaction of rocks. The choice of methods for the prediction and evaluation of AHFP should be based on the origin of abnormal pressure and the lithology of the rocks. The reservoir properties of rocks in AHFP zones suggest that...

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