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    From OBC seismic to porosity volume: a pre-stack analysis of a turbidite reservoir, deepwater Campos Basin, Brazil

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    From OBC seismic to porosity ...
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    Author
    Martins, Luiz M R
    Advisor
    Davis, Thomas L. (Thomas Leonard), 1947-
    Date issued
    2013
    Keywords
    petrophysics
    inversion
    angle gathers
    pre-stack
    porosity
    impedance
    Petroleum -- Geology -- Brazil
    Seismic prospecting -- Brazil
    Turbidites
    Acoustic impedance
    Seismic traveltime inversion
    
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    URI
    https://hdl.handle.net/11124/80342
    Abstract
    The Campos Basin is the best known and most productive of the Brazilian coastal basins. Turbidites are, by far, the main oil-bearing reservoirs. Using a four component (4-C) ocean-bottom-cable (OBC) seismic survey I set out to improve the reservoir characterization in a deep-water turbidite field in the Campos Basin. In order to achieve my goal, pre-stack angle gathers were derived and PP and PS inversion were performed. The inversion was used as an input to predict the petrophysical properties of the reservoir. Converting seismic reflection amplitudes into impedance profiles not only maximizes vertical resolution but also minimizes tuning effects. Mapping the porosity is extremely important in the development of a hydrocarbon reservoirs. Combining seismic attributes derived from the P-P data and porosity logs I use linear multi-regression and neural network geostatistical tools to predict porosity between the seismic attributes and porosity logs at the well locations. After predicting porosity in well locations, those relationships were applied to the seismic attributes to generate a 3-D porosity volume. The predicted porosity volume highlighted the best reservoir facies in the reservoir. The integration of elastic impedance, shear impedance and porosity improved the reservoir characterization.
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