Schlumberger

Effective Stress Compensation (ESC)

Improve image quality

The presence of salt can result in a decrease in the density of the sedimentary layers underneath it, and with it a change in effective stress. Since effective stress is functionally related to seismic velocity, these changes perturb the velocity field used for depth migration and can result in a degradation of the subsalt image.

We have developed a technique for translating changes in sub-salt density and effective stress to a residual velocity field below a salt body. Effective stress compensation provides an updated velocity model for depth imaging that can improve image quality and increase confidence in the positioning of sub-salt features.

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WesternGeco

Increase Confidence in Positioning of Sub-Salt Features

Subsalt velocity model update using ESC.
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