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Abstract

Summary

The Hoop Fault Complex presents a significant imaging challenge, most notably where large velocity induced sags are evident in the footwall of the major areal extensional faults. These sags arise from large velocity contrasts across the fault. Resolving the velocity contrast is made more challenging by illumination issues resulting from the narrow single azimuth of acquisition. Previously, this velocity complexity had been addressed using both, fault and horizon-constrained tomography. Though largely successful, both of these approaches require subjective interpretation.

We present an objective data driven approach to resolve fault sags, which generated a more geologically realistic model of the Hoop Fault Complex than previously obtained via conventional tomography. Multiparameter offset-dependent picking was applied to model the complex moveout associated with this structure, in place of single parameter residual curvature picks. The tomographic update was then constrained by an image guided inversion. This resulted in a more geologically plausible velocity model, where layering and faulting are better honoured by the inversion update.

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/content/papers/10.3997/2214-4609.201413378
2015-06-01
2024-04-25

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References

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Offset Dependent Picking and Image Guided Tomographic Modelling of Velocity Variations over the Hoop Fault Complex
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201413378
/content/papers/10.3997/2214-4609.201413378
/content/papers/10.3997/2214-4609.201413378
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