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Fluid pressure detection and porosity evaluation from well logs are largely based on an assumed relationship between high fluid pressures and high porosities due to undercompaction. However, few data have been presented which demonstrate to what extent porosities are higher in overpressured than in normally pressured shales of similar type, and how this porosity difference is detected by the responses from standard logs. Jurassic intra-reservoir shales on Haltenbanken (offshore mid-Norway) are particularly well-suited for such an investigation because (a) the area is subdivided into two, major, distinctive pressure regimes (one normally pressured, the other highly overpressured) and (b) the...

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