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Abstract

Summary

Conventional (linear) migration algorithms use only a small portion of recorded seismic data (primary reflections) because they rely on single-scattering assumptions. Nonlinear imaging methods also use reflected multiply-scattered waves, benefiting from their additional illumination and sensitivity to the model. Primary and multiple reflections are, however, just part of the energy generated during a seismic experiment - transmitted waves are also generated but are usually not recorded by one-sided (surface seismic) acquisition systems. In theory only two-sided illumination of the imaging target would allow this energy to be recorded and used in migration. Here we use a synthetic example of subsalt imaging to show the nature of improvements to the seismic image (and extended image) from the use of multiples and transmitted waves. We then suggest a practical approach to construct the additional fields required by nonlinear two-sided imaging without the need of a velocity model with sharp contrasts and receivers (and/or sources) in the subsurface.

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/content/papers/10.3997/2214-4609.20141487
2014-06-16
2024-04-25

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20141487
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Beyond Conventional Migration - Nonlinear Subsalt Imaging with Transmissions and Two-sided Illumination
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20141487
/content/papers/10.3997/2214-4609.20141487
/content/papers/10.3997/2214-4609.20141487
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