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Abstract

Summary

We present the results of a pre-stack time-shift analysis and inversion study for evaluating the influence of dynamic overburden-related anomalies on 4D reservoir monitoring. This study consists of the application of line fitting techniques to analyse pre-stack time shift fields to generate time shift intercept and gradient maps. A new inversion technique is then designed to invert pre-stack time-shift variation with offset (TVO) directly to 4D velocity perturbations. This method is based on the application of a V-scanning operator in the distance-offset domain and the direct derivation of a velocity perturbation section utilising a geometrical relationship between an overburden anomaly and its pre-stack time shift signature. The results of the study are presented for synthetic analogues and real data examples from the Shearwater field. We show the use of pre-stack time-shift analysis offers improved description of time-shift maps in relation to post-stack derived equivalents and that time-shift inversion via V-scanning inversion determines the velocity perturbation fields. These approaches offer the ability to delineate the influence of dynamic overburden effects on 4D reservoir models and incorporate the associated 4D velocity perturbation into imaging scheme during the processing stage.

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/content/papers/10.3997/2214-4609.201800699
2018-06-11
2024-04-25

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References

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Evaluating 4D Overburden Velocity Perturbation for the Shearwater Field via Pre-Stack Time-Shift Inversion.
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201800699
/content/papers/10.3997/2214-4609.201800699
/content/papers/10.3997/2214-4609.201800699
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