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    Estimation of seismic attenuation and prediction of VTI anisotropy parameters from VSP and log data: a case study from the Middle East

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    Fulltext not available
    Authors
    Alasbali, A.
    Pevzner, Roman
    Tertyshnikov, Konstantin
    Bóna, Andrej
    Gurevich, Boris
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Alasbali, A. and Pevzner, R. and Tertyshnikov, K. and Bóna, A. and Gurevich, B. 2016. Estimation of seismic attenuation and prediction of VTI anisotropy parameters from VSP and log data: a case study from the Middle East. Arabian Journal of Geosciences. 9: 485.
    Source Title
    Arabian Journal of Geosciences
    DOI
    10.1007/s12517-016-2509-4
    ISSN
    1866-7511
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/15618
    Collection
    • Curtin Research Publications
    Abstract

    © 2016, Saudi Society for Geosciences. Quantitative interpretation of seismic data depends upon the amplitude analysis of reflected waves. However, the quality of the image obtained can be significantly affected by attenuation and anisotropy in the overburden. Therefore, the insights into the magnitude, sources and spatial distribution of these parameters may prove to be substantial for improving the quality of seismic image and reservoir characterisation. Both seismic vertical transverse isotropy (VTI) anisotropy and scattering attenuation could be caused by the layering. In order for these phenomena to play a major role, strong elastic contrasts between them are needed. In this paper, we present the case study from a typical setting in the Middle East where such a contrast between stiff carbonates and relatively soft siliciclastic sediments significantly deteriorates the quality of the seismic image. Vertical seismic profiling (VSP) and log data from one of the wells in the region are used to demonstrate this phenomenon. Apparent attenuation from VSP data is estimated using a modified centroid frequency shift method. The log data for seismic forward modelling is used in order to show that scattering could be a significant contributor to the apparent attenuation. In addition, by using both Backus averaging and synthetic walk-away VSP data analysis, we demonstrate that the same layering can be responsible for a significant TI anisotropy.

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