Overburden geological complexities such as cemented sand injectites can degrade the image quality at reservoir level, introducing errors and uncertainties for quantitative interpretation.

In this study, we employ depth domain inversion to improve amplitude fidelity and resolution beneath the injectites, and to obtain a more reliable estimation of acoustic rock properties.

The dip-dependent illumination effects caused by overburden heterogeneities are modelled by 3D deterministic operators, that are calibrated to well information to perform seismic amplitude inversion directly in the depth domain. This migration-inversion approach is an image-domain Least-Squares Kirchhoff Depth Migration.

The result is a higher-resolution image, showing better-balanced amplitudes and improved event continuity. The depth domain inversion to acoustic impedance demonstrated an increased reliability of seismic amplitudes, leading to an improved quantitative interpretation.


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