Combining wave paths to improve Brazil’s pre-salt image, Central Santos Basin multi-azimuth reimaging

Ortin, Marcela; Ysaccis, Raúl; Li, Hongyan; Barros, Pedro

doi:10.1190/segam2020-3427597.1

Cited by 4 publications

(3 citation statements)

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“…With the developments of signal processing and depth imaging in recent years, the central Santos multi-azimuth (MAZ) reimaging project was initiated at the end of 2019. Ortin et al (2020) provided a comprehensive introduction to the reprocessing effort. The results from the fast-track processing show significant improvements in the pre-salt imaging against the legacy result (Ortin et al, 2020), obtained by adaptive deghosting (Rickett, 2014;Zarkhidze et al, 2016), velocity updates inside the salt and pre-salt zone, and the image combination of one of the NAZ surveys and the FAZ survey.…”

Section: Introductionmentioning

confidence: 99%

“…Ortin et al (2020) provided a comprehensive introduction to the reprocessing effort. The results from the fast-track processing show significant improvements in the pre-salt imaging against the legacy result (Ortin et al, 2020), obtained by adaptive deghosting (Rickett, 2014;Zarkhidze et al, 2016), velocity updates inside the salt and pre-salt zone, and the image combination of one of the NAZ surveys and the FAZ survey. In this study, a contemporary signal processing flow (Figure 2) is applied consistently to the three NAZ and the FAZ legacy datasets.…”

Section: Introductionmentioning

confidence: 99%

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Optimum signal re-processing of multiple legacy surveys to improve pre-salt imaging in the complex Santos Basin, Brazil

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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SantosBasin is emerging as one of the world's most promising exploration and production areas. The pre-salt region is complex, with fast carbonates, slow sediments, volcanic layers, and large fault systems. Together with the complicated overburden structures including carbonate layers in the post salt and stratified salt, high-resolution imaging is critical to better understand the producing fields and to facilitate development of others. High-resolution imaging relies on adequate illumination, seismic data with sufficient resolution and a good signal-to-noise (SNR), and an accurate velocity model. The accuracy of the velocity model is also dependent on the quality of seismic data. In the central Santos Basin, by combining several legacy surveys along different shooting directions, we show that the illumination of the target zones is increased. With signal processing technologies developed in recent years, we show that the SNR and resolution of the data were improved. Surface multiple attenuation is challenging in this area due to the existence of high-velocity, steepdipping post-salt carbonates and stratified evaporites. We show that multiple prediction is improved by the larger crossline aperture enabled by the incorporation of all the legacy data; therefore, improved multiple elimination was achieved. With the reprocessed higher resolution and higher SNR data and increased azimuth sampling, a more accurate velocity model is inverted by contemporary model building technologies. Finally, delivering high-resolution presalt imaging.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimum signal re-processing of multiple legacy surveys to improve pre-salt imaging in the complex Santos Basin, Brazil

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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“…Today, with Santos Basin being one of the world's most promising exploration and production areas, rigorous seismic imaging is required to better understand the producing fields and to facilitate the development of other prospects. By combining the data from several previous seismic acquisitions in this area, we can generate multi-azimuth (MAZ) data to produce high-resolution imaging in the central Santos area (Ortin et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Post-migration image optimization of multi-azimuth legacy data in Central Santos Basin

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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In complex presalt reservoirs such as the Santos Basin in Brazil, improvements in our techniques for combining and imaging legacy datasets can postpone the need for additional costly seismic acquisitions. In this case study, we show how data from several legacy acquisitions with varying azimuths were carefully combined to create a contiguous multi-azimuth image. Two different migration algorithms are used with each having tailored approaches for the weighting and summation of the migrated data. Compared to the legacy image, significant improvement is attained in terms of signal-to-noise ratio, the coherency of evaporite layers, base salt, presalt, and basement events, and the delineation of the pre-salt faults.

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Optimum signal reprocessing of multiple legacy data sets to improve presalt imaging in central Santos Basin, Brazil

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Lansky

et al. 2021

First International Meeting for Applied Geoscience &Amp; Energy Expanded Abstracts

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Combining wave paths to improve Brazil’s pre-salt image, Central Santos Basin multi-azimuth reimaging

Cited by 4 publications

References 7 publications

Optimum signal re-processing of multiple legacy surveys to improve pre-salt imaging in the complex Santos Basin, Brazil

Optimum signal re-processing of multiple legacy surveys to improve pre-salt imaging in the complex Santos Basin, Brazil

Post-migration image optimization of multi-azimuth legacy data in Central Santos Basin

Optimum signal reprocessing of multiple legacy data sets to improve presalt imaging in central Santos Basin, Brazil

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