The 4D seismic signature of oil-water contact movement due to natural production in a stacked turbidite reservoir

    Research output: Contribution to journalArticle

    Abstract

    Combined time-lapse reservoir simulation and seismic modelling has been performed on both 1D and 3D models of a channelized turbidite reservoir. The models have been built using core, log, laboratory and seismic data from the Nelson Field (central North Sea) as a template. Oil and water movement in the main channels, channel margins and interchannel regions is investigated, with a particular focus being the effect of poor net-to-gross. The analysis confirms that saturation effects dominate the response whilst stress-sensitivity effects play a minor role. The trough-peak signature in the seismic difference volumes formed by the sweep of the water can be continued and mapped slightly further than the channel margins. This characteristic 4D signature remains roughly intact, despite the complicated depositional architecture, and accurately delineates the area of moved fluid, but it needs additional calibration to combat the detrimental influence of the low net-to-gross. Signal strength is largely dependent on reservoir quality, but is also compromised by the net-to-gross, fluid distribution and, more critically, by the exact timing of the seismic survey. For example, a region of bypassed oil zone remains undetected as it forms early during the production. This work demonstrates that to understand fully the 4D signature at a quantitative level requires adequate knowledge of the fluid properties, but also, more critically, the geology. © 2005 European Association of Geoscientists & Engineers.

    Original languageEnglish
    Pages (from-to)183-203
    Number of pages21
    JournalGeophysical Prospecting
    Volume53
    Issue number2
    DOIs
    Publication statusPublished - Mar 2005

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    turbidite
    fluid
    oil
    seismic survey
    water
    seismic data
    trough
    geology
    saturation
    calibration
    modeling
    simulation
    effect

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    title = "The 4D seismic signature of oil-water contact movement due to natural production in a stacked turbidite reservoir",
    abstract = "Combined time-lapse reservoir simulation and seismic modelling has been performed on both 1D and 3D models of a channelized turbidite reservoir. The models have been built using core, log, laboratory and seismic data from the Nelson Field (central North Sea) as a template. Oil and water movement in the main channels, channel margins and interchannel regions is investigated, with a particular focus being the effect of poor net-to-gross. The analysis confirms that saturation effects dominate the response whilst stress-sensitivity effects play a minor role. The trough-peak signature in the seismic difference volumes formed by the sweep of the water can be continued and mapped slightly further than the channel margins. This characteristic 4D signature remains roughly intact, despite the complicated depositional architecture, and accurately delineates the area of moved fluid, but it needs additional calibration to combat the detrimental influence of the low net-to-gross. Signal strength is largely dependent on reservoir quality, but is also compromised by the net-to-gross, fluid distribution and, more critically, by the exact timing of the seismic survey. For example, a region of bypassed oil zone remains undetected as it forms early during the production. This work demonstrates that to understand fully the 4D signature at a quantitative level requires adequate knowledge of the fluid properties, but also, more critically, the geology. {\circledC} 2005 European Association of Geoscientists & Engineers.",
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    The 4D seismic signature of oil-water contact movement due to natural production in a stacked turbidite reservoir. / MacBeth, Colin; Stephen, K. D.; McInally, A.

    In: Geophysical Prospecting, Vol. 53, No. 2, 03.2005, p. 183-203.

    Research output: Contribution to journalArticle

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