1887
Volume 43, Issue 11
  • ISSN: 0263-5046
  • E-ISSN: 1365-2397

Abstract

Abstract

We conducted a feasibility study on the processing of converted PS waves for an OBN (ocean bottom node) acquisition parameterised for PP data only. The PS seismic data was preconditioned and prepared as input for tomographic iterations to update the Vs velocity. Available geotechnical measurements were combined with an empirical model to construct the very shallow Vs velocity from the water bottom up to 200 m. From 200 m to the basement, the initial VS model was built using a predefined conversion pattern using the legacy PP velocity. After several tomographic steps, an initial set of images, migrated with Kirchhoff algorithm, presented several identifiable PS events in the PP volume. Refinements of Vs field, conducted by PP-PS correlation, improved the quality of PS data, mainly below the salt layer. Finally, partial stacks served as input data to a joint PP-PS elastic inversion test which resulted in a S impedance volume much closer to well data than the one derived from inversion of PP data only.

Loading

Article metrics loading...

/content/journals/10.3997/1365-2397.fb2025083
2025-11-01
2025-11-13
Loading full text...

Full text loading...

References

  1. Ata, E., Olson, R., Mosher, C.C., Shaw, S. and Betterly, S. [2013]. Look at converted waves from an OBN test survey. SEG Technical Program Expanded Abstract, 5170–5174.
    [Google Scholar]
  2. Baziw, E. and Verbeek, G. [2017]. Quality Assessment of Seismic Data Sets and the Impact on Interval Velocity Estimates in DST. Proceedings of the DFI 42nd Annual Conference on Deep Foundations, 598–608.
    [Google Scholar]
  3. Bezerra, M., Simmons, J. and Gaiser, J. [2022]. Seafloor elastic parameters estimation using a regression neural network. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 3671–3675.
    [Google Scholar]
  4. Brando, G., Benjamin, H. and Cypriano, L. [2023]. Imaging the presalt with elastic FWI using OBN data. Third International Meeting for Applied Geoscience and Energy Expanded Abstracts, 685–689.
    [Google Scholar]
  5. Bulcão, A., Almeida, A.C., Dias, B.P., Cortez, C.A.C., Soares, D.M., Alves, G.C., Barros, P.M. and Girardi, T.I. [2023]. Elastic FWI: A study on parametrization and applications of the pseudo-Hessian. Eighteenth International Congress of the Brazilian Geophysical Society, Abstract.
    [Google Scholar]
  6. Casado, N., Carneiro, M., Parekh, C., Barros, P., Igarashi, J. and Castro, C. [2024]. Improved Target Illumination Using High-Frequency Elastic FWI for Santos Basin OBN Surveys. Fourth EAGE Conference on Pre-Salt Reservoir, Extended Abstracts.
    [Google Scholar]
  7. Cho, Y., Solano, C.P., Kimbro, J., Yang, Y., Plessix, R. and Matson, K. [2022]. Influence of shear velocity on elastic full-waveform inversion: Gulf of Mexico case study using multicomponent ocean-bottom node data. Geophysics, 87(5), 391–400.
    [Google Scholar]
  8. Cruz, N., Cruz, J., Teixira, L., Costa, M., Oliveira, L.B., Urasaki, E.N., Bispo, T., Jardim, M., Grochau, M. and Maul, A. [2021]. Tupi Nodes pilot: A successful 4D seismic case for Brazilian presalt reservoirs. The Leading Edge, 40(12), 886–896.
    [Google Scholar]
  9. D’Afonseca, L., Krishnasamy, T., Birkeland, O.J., Guillaume, P., Santiago, T.M.G, Guerra, C. and Lima, R. [2014]. Innovative PSDM processing of OBC data on Albacora field. SEG Technical Program Expanded Abstracts, 1832–1836.
    [Google Scholar]
  10. Damasceno, A., Tura, A. and Simmons, J. [2021]. The added value of joint PP–PS inversion for reservoir characterization: A case study using Jubarte PRM seismic data (offshore Brazil). Geophysical Prospecting, 70(1), 121–134.
    [Google Scholar]
  11. Damasceno, A., Lima, G.R., Rapini, M. and Silva, L.M.T. [2025]. Nodes Acquisitions PS-waves Added Value: Impact of PS-stacks on Elastic Inversion for a Brazilian Pre-Salt Reservoir. 86th EAGE Annual Conference & Exhibition (including the Workshop Programme), Extended Abstracts.
    [Google Scholar]
  12. Davydenko, M. and Verschuur, D. [2016]. Optimal imaging of OBN data using all multiples. SEG Technical Program Expanded Abstract, 4230–4234.
    [Google Scholar]
  13. Formigli, J. [2008]. Santos Basin Pre-Salt Cluster: How to Make Production Development Technical and Economically Feasible. Rio Oil and Gas Conference, Abstract.
    [Google Scholar]
  14. Gaiser, J. [2016]. 3C Seismic and VSP: Converted waves and vector wavefield applications. SEG Distinguished Instructor Short Course, 155–200.
    [Google Scholar]
  15. Jouno, F., Martinez, A., Ferreira, D., Donno, D. and Khalil, A. [2019]. Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI. SEG Technical Program Expanded Abstract, 1345–1350.
    [Google Scholar]
  16. Ning, I., Tan, J. and Dash, R. [2024]. Sparse ocean bottom node seismic interferometry and inversion: A Gulf of Mexico study. Fourth International Meeting for Applied Geoscience & Energy, 1830–1834.
    [Google Scholar]
  17. Ristow, J., Lanznaster, D. and Jouno, F. [2024]. Advances in OBN Imaging for Pre-Salt Fields. 85th EAGE Annual Conference and Exhibition, Extended Abstracts.
    [Google Scholar]
  18. Rodriguez-Suarez, C. [2005]. Sea-bottom shear-wave velocities and mode conversions. Revista Brasileira de Geofísica, 23(1), 75–87.
    [Google Scholar]
  19. Zhigang, Z., Mei, J., Lin, F., Huang, R. and WangZhang, P. [2018]. Correcting for salt misinterpretation with full-waveform inversion. SEG Technical Program Expanded Abstracts, 1143–1147.
    [Google Scholar]
/content/journals/10.3997/1365-2397.fb2025083
Loading
/content/journals/10.3997/1365-2397.fb2025083
Loading

Data & Media loading...

  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

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