1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. 81st EAGE Conference and Exhibition 2019
  5. Conference paper

Abstract

Summary

The central North Sea presents a number of difficulties for velocity model building and seismic imaging. In relatively shallow waters, acquisition geometries typically used for 3D seismic exploration leave little scope for reflection tomography to update the near surface velocity. Shallow gas pockets complicate both velocity estimation and imaging at depth, and anisotropy is difficult to estimate or validate without near-surface well control. Under these conditions Full Waveform Inversion (FWI) provides an option for velocity estimation. We present a 3-parameter workflow addressing velocity, absorption factor (Q), and epsilon. This is achieved with double application of 2-parameter joint FWI, solving first for Vp/Q then Vp/epsilon. This improves the imaging and positioning of complex injectite structures around 2.1 km depth. Beyond the needs of seismic imaging, we also seek an increased level of detail in the final velocity model for use as the low-frequency contribution to impedance inversion. This is achieved by altering the FWI to balance the contributions of reflections and refractions to the global gradient and cost function. By carefully increasing the weight of reflections, the level of velocity detail is increased at injectite level whilst maintaining the stability of the inversion and velocity estimate brought by refractions.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201901226
2019-06-03
2024-04-19

  • From This Site

    /content/papers/10.3997/2214-4609.201901226
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Guillaume, P., Montel, J. P., Hollingworth, S., Zhang, X., Prescott, A., Reinier, M., Jupp, R., Lambare, G., Pape, O. and Cacalie, A.
    [2012] Seismic imaging with multi-layer tomography. First Break, 30, 85–90.
     [Google Scholar]
  2. Hou, S., Haacke, R. R., Corbett, A. and Wanczuk, M.
    [2018] Velocity Model Building with Guided Wave Inversion. 80th EAGE Conference & Exhibition, 10.3997/2214‑4609.201801164.
     https://doi.org/10.3997/2214-4609.201801164 [Google Scholar]
  3. Hurst, A. and Cartwright, J.
    [2007] Sand injectites: Implications for hydrocarbon exploration and production. AAPG Memoir, 87.
     [Google Scholar]
  4. Jones, I. F., Singh, J., Greenwood, S., Chigbo, J., Cox, P. and Hawke, C.
    [2018] High-resolution impedance estimation using refraction and reflection FWI constraints: the Fortuna region, offshore Equatorial Guinea. First Break, 11, 39–44.
     [Google Scholar]
  5. Malinowski, M., Operto, S., and Ribodetti, A.
    [2011] High-resolution seismic attenuation imaging from wide-aperture onshore data by visco-acoustic frequency-domain full-waveform inversion. Geophysical Journal International, 186, 1179–1204.
     [Google Scholar]
  6. McLeman, J., Xiao, B., Page, C., Jouno, F., Salaun, N., Roubaud, A. and Perrone, F.
    [2018] Next Generation Shallow Water Resolution: Primary Wave Imaging and High Frequency Visco-acoustic Full-waveform Inversion. 80th EAGE Conference and Exhibition, 10.3997/2214-4609.201801163.
     [Google Scholar]
  7. Murphy, S.D. and Wood, P.H.
    [2011] Palaeogene remobilized sandstones of the Central North Sea – implications for hydrocarbon migration. First Break, 29, 45–55.
     [Google Scholar]
  8. Plessix, R. E., Stopin, A., Kuehl, H., Goh, V. and Overgaag, K.
    [2016] Visco-acoustic full waveform inversion. 78th EAGE Conference and Exhibition, 10.3997/2214‑4609.201600827.
     https://doi.org/10.3997/2214-4609.201600827 [Google Scholar]
  9. Xiao, B., Ratcliffe, A., Latter, T., Xie, Y. and Wang, M.
    [2018] Inverting for near-surface absorption with full-waveform inversion: a case study from the North Viking Graben in the northern North Sea. 80th EAGE Conference and Exhibition, 10.3997/2214‑4609.201800681.
     https://doi.org/10.3997/2214-4609.201800681 [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201901226
Loading
High-Resolution Velocity Model Building and Imaging for Injectites in the Central North Sea
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201901226
/content/papers/10.3997/2214-4609.201901226
/content/papers/10.3997/2214-4609.201901226
Loading

Data & Media loading...

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