1887

Abstract

Summary

During the time taken for seismic data to be acquired, reservoir pressure and saturation may fluctuate as a consequence of field production and operational procedures. This has consequences for the quantitative analysis of 4D seismic data and particularly for understanding of the pressure signal that diffuses rapidly into the reservoir over a time-scale of hours or less. A modelling study using actual acquisition data (permanent seabed sensors and also towed streamers), reveals that the signature of pressure variations in the pre-stack domain is complex, and thus the resultant post-stack image is not representative of the true reservoir mechanisms that caused the pressure changes. This is of particular concern when trying to accurately resolve small pressure changes away from wells with post-stack data. It appears however that larger signals closer to the well may still be detected adequately. Our results have implications for post-stack quantitative 4D seismic analysis, as well as processing and acquisition workflows for detailed seismic time-lapse studies.

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/content/papers/10.3997/2214-4609.201413467
2015-06-01
2024-04-20
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References

  1. •Alvarez, E. and MacBeth, C. (2014) An insightful parameterization for the flatlander’s interpretation of time-lapsed seismic data. Geophysical Prospecting62, 75–96.
    [Google Scholar]
  2. •AminiH. (2014) A pragmatic approach to simulator to seismic modelling for 4D seismic interpretation. PhD Thesis, Institute of Petroleum Engineering, Heriot-Watt University.
    [Google Scholar]
  3. •Campbell, S., Ricketts, T. A., Davies, D. M. , Slater ,C. P., Lilley, G G, Brain, J., Stammeijer, J., and Evans, A.C. (2005) Improved 4D Seismic Repeatability - a West of Shetlands Towed Streamer acquisition case history. SEG Technical Program Expanded Abstracts 2005, pp. 2394–2397.
    [Google Scholar]
  4. •Eiken, O. and Tøndel, R (2005) Sensitivity of Time-lapse Seismic Data to Pore Pressure changes: Is Quantification Possible?Society of Exploration Geophysicists, 24 (12), 1250–1254.
    [Google Scholar]
  5. •Eriksrud, M. (2014) Seabed permanent reservoir monitoring (PRM) - A valid 4D seismic technology for fields in the North Sea. First Break, 32 (5), 67 – 73.
    [Google Scholar]
  6. •Falahat, R, Obidegwu, D., Shams, A., and MacBeth, C. (2014) The interpretation of amplitude changes in 4D seismic data arising from gas exsolution and dissolution, Petroleum Geoscience, 20, 303– 320.
    [Google Scholar]
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