Many field examples have shown the 4D seismic signals that can only be explained by triaxial stress variations, shear-wave splitting, and azimuthal velocity variation during production. This paper addresses why we must incorporate the triaxial stress computation in modelling of 4D seismic response. We show how geomechanical modelling can be embedded in the time-lapse rock-physic modelling. The proposed workflow predicts the time-lapse seismic response of the earth model in the over/under burden and reservoir. It was demonstrated that the AVO azimuthal response is sensitive to the pressure drop/build up and reservoir compartmentalization. The strain anisotropy translates to an orthorhombic model. Therefore, orthorhombic AVO azimuthal inversion was employed to quantify the change in strain anisotropy.


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