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From pore-pressure prediction to reservoir characterization

A combined geomechanics-seismic inversion workflow using trend-kriging techniques in a deepwater basin

Schlumberger, Houston, USA

Lei Leu, Bill Troyer and Jerry Moore

Nexen Petroleum USA, Dallas

Corresponding author: rbachrach{at}slb.com

To optimize drilling decisions and well planning in overpressured areas, it is essential to carry out pore-pressure predictions before drilling. Knowledge of pore pressure implies knowledge of the effective stress, which is a key input for several geomechanics applications, such as fault slip and fault seal analysis and reservoir compaction studies. It is also a required input for 3D and 4D seismic reservoir characterization. Because the seismic response of shales and sand depends on their compaction history, the effective stress will govern the sedimentary seismic response. This is in contrast to normally pressured regimes, where the depth below mudline (or overburden stress) is typically used to characterize the compaction effect.

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