1887

Abstract

Summary

A combination of complex geology and limitations imposed by the surface seismic acquisition geometry results in seismic images contaminated by variabilities in wave propagation effects such as illumination. Consequently, imprints of variable illumination compromise the reliability of the amplitude and phase within the seismic image. Additionally, today's conventional methods of amplitude inversion assume that the seismic amplitudes are representative of the earth's acoustic and elastic properties and do not compensate for variable illumination effects.

We present a subsalt case study from the Gulf of Mexico demonstrating least-squares migration in the image domain with point-spread functions (PSF) ability to simultaneously correct for illumination effects and produce a higher-resolution image of thin sand beds located in close proximity to base of salt. We discuss our approach for mitigating scattering effects present in the PSFs arising from high-contrast impedance boundaries within the earth model. Finally, we show the results from a poststack depth-domain inversion, providing true amplitude images and acoustic impedance volumes and allowing reliable assessment of the viability of previously identified drilling targets and enabling corresponding augmentation of prospect interpretation.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201901185
2019-06-03
2024-03-29
Loading full text...

Full text loading...

References

  1. Fletcher, R. P., Archer, S. H., Nichols, D. and Mao, W.
    [2012] Inversion after depth imaging. 82nd Annual International Meeting, SEG, Expanded Abstracts, 1–5.
    [Google Scholar]
  2. Fletcher, R. P., Nichols, D., Bloor, R. and Coates, R.T.
    [2016] Least-squares migration - Data domain versus image domain using point spread functions. The Leading Edge, 35(2), 157–162.
    [Google Scholar]
  3. FletcherR., Cavalca, M. and Nichols, D.
    [2018] Improving image-domain least-squares reverse-time migration close to high velocity contrasts. 80th EAGE Conference and Exhibition, Extended Abstracts.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201901185
Loading
/content/papers/10.3997/2214-4609.201901185
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error