1887

Abstract

Summary

Time-lapse seismic processing in carbonate fields having complex geology and in difficult seismic contexts requires highly specialized teams for success. Our field case has a flat structure, a poorly-imaged but highly reflective sea bottom and is covered by towed-streamer data in about 60m of water depth. Multiples contamination is severe and these are coherent with primaries. We tested several 4D seismic processing routes using a base and two monitor surveys and have summed up our experiences in four learning points: A simplified targeted demultiple flow avoiding adaptive methods improves 4D metrics better than a complicated one. A guided co-denoise technique using base and monitor vintages attenuate non-repeated noise from data while preserving 4D timeshifts and 4D amplitude changes. A mute design optimization prior to stack attenuates residual multiples that degrade 4D signal. Finally, seismic acquisition parameters have a strong impact on computed 4D seismic attributes even if this may not be the case in 3D. These learning points coupled with multidisciplinary interactions and an iterative processing QC strategy assure the delivery of data with a more interpretable 4D signal that permit the delineation of depleted zones, flushed zones and by-passed oil for future infill-well drilling and optimal reservoir management.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201700809
2017-06-12
2024-03-28
Loading full text...

Full text loading...

References

  1. Adeyemi, A., Brechet, E., HubansC, Euriat, C.PigeaudT., Emang, M.
    [2014] Initial Results of a Pilot 4D Seismic Monitor in a Difficult Shallow Offshore Carbonate Context - Dynamic Connectivity and Implications for Development. 76th EAGE Conference and Exhibition.
    [Google Scholar]
  2. Blanco, B., Charron, P., Brechet, E., Pagliccia, B., Radigon, M. and Emang, M.
    [2014] SPE 172035 4D Seismic Processing Pilot, Offshore Qatar. ADIPEC 10–13 November 2014.
    [Google Scholar]
  3. Khalil, A., Hoeber, H., Campbell, S., Ibram, M., Davies, D.
    [2012] An optimized workflow for coherent noise attenuation in time-lapse processing. 75th EAGE Conference and Exhibition
    [Google Scholar]
  4. Pagliccia, B., Cantine, F., Brechet, E., Brosile, E., Blanco, B., Charron, P., Emang, M. et al
    . [2014]. “From feasibility to Processing: a time-lapse seismic experiment on xxxx field — offshore Qatar”. SPE 17582 presented at the 2014 IPTC, Doha, Qatar.
    [Google Scholar]
  5. Roodaki, A., Bouquard, G., Bouhdiche, O., Sternfels, R., Rollet, A., Lafram, A.
    , [2016] SVD-based Hydrophone Driven Shear Noise Attenuation for Shallow Water OBS. 75th EAGE Conference and Exhibition
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201700809
Loading
/content/papers/10.3997/2214-4609.201700809
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