Observation of azimuthal anisotropy from the seismic reflectivity of a Tertiary turbidite sand

    Research output: Contribution to journalArticle

    Abstract

    P-wave data from a time-lapse 3D OBC survey have been analysed to estimate and interpret azimuthal seismic anisotropy. This is achieved by careful processing to preserve the azimuthal signature. The survey images a major reservoir body in a channelized turbidite field in the Gulf of Mexico. Three distinct and significant anisotropy anomalies are discovered on or around this particular '4500-ft sand', all of which change intensity but not orientation with hydrocarbon production. These anomalies are distributed along the highest concentration of cumulative sand thickness, with their symmetry axes aligned with the main channel axis. We suspect that this time-lapse anisotropy could be caused by the alignment of the depositional grain fabric. Theoretical calculation predicts that this mechanism, when combined with fluid-saturation changes, can generate the observed pattern of behaviour. If further supported by other researchers, this result would indicate that appropriately designed seismic surveys could be a useful tool for palaeo-direction studies in clastic reservoirs and also a useful constraint for directional permeability in the reservoir flow simulation model. © 2006 European Association of Geoscientists & Engineers.

    Original languageEnglish
    Pages (from-to)553-564
    Number of pages12
    JournalGeophysical Prospecting
    Volume54
    Issue number5
    DOIs
    Publication statusPublished - Sep 2006

    Fingerprint

    turbidite
    reflectivity
    anisotropy
    sand
    anomaly
    seismic anisotropy
    seismic survey
    P-wave
    symmetry
    saturation
    permeability
    hydrocarbon
    fluid
    simulation

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    title = "Observation of azimuthal anisotropy from the seismic reflectivity of a Tertiary turbidite sand",
    abstract = "P-wave data from a time-lapse 3D OBC survey have been analysed to estimate and interpret azimuthal seismic anisotropy. This is achieved by careful processing to preserve the azimuthal signature. The survey images a major reservoir body in a channelized turbidite field in the Gulf of Mexico. Three distinct and significant anisotropy anomalies are discovered on or around this particular '4500-ft sand', all of which change intensity but not orientation with hydrocarbon production. These anomalies are distributed along the highest concentration of cumulative sand thickness, with their symmetry axes aligned with the main channel axis. We suspect that this time-lapse anisotropy could be caused by the alignment of the depositional grain fabric. Theoretical calculation predicts that this mechanism, when combined with fluid-saturation changes, can generate the observed pattern of behaviour. If further supported by other researchers, this result would indicate that appropriately designed seismic surveys could be a useful tool for palaeo-direction studies in clastic reservoirs and also a useful constraint for directional permeability in the reservoir flow simulation model. {\circledC} 2006 European Association of Geoscientists & Engineers.",
    author = "Colin Macbeth and Asghar Shams",
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    Observation of azimuthal anisotropy from the seismic reflectivity of a Tertiary turbidite sand. / Macbeth, Colin; Shams, Asghar.

    In: Geophysical Prospecting, Vol. 54, No. 5, 09.2006, p. 553-564.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AB - P-wave data from a time-lapse 3D OBC survey have been analysed to estimate and interpret azimuthal seismic anisotropy. This is achieved by careful processing to preserve the azimuthal signature. The survey images a major reservoir body in a channelized turbidite field in the Gulf of Mexico. Three distinct and significant anisotropy anomalies are discovered on or around this particular '4500-ft sand', all of which change intensity but not orientation with hydrocarbon production. These anomalies are distributed along the highest concentration of cumulative sand thickness, with their symmetry axes aligned with the main channel axis. We suspect that this time-lapse anisotropy could be caused by the alignment of the depositional grain fabric. Theoretical calculation predicts that this mechanism, when combined with fluid-saturation changes, can generate the observed pattern of behaviour. If further supported by other researchers, this result would indicate that appropriately designed seismic surveys could be a useful tool for palaeo-direction studies in clastic reservoirs and also a useful constraint for directional permeability in the reservoir flow simulation model. © 2006 European Association of Geoscientists & Engineers.

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