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Abstract

Rocks equivalent to the Permian-Triassic Khuff-A and -B reservoirs crop out near Buraydah in central Saudi Arabia. An outcrop-based geocellular model 600 m x 385 m x some 30 m was used to compute 3-D synthetic seismic models used to evaluate how much improvement in resolution of conventional seismic would be required in order to detect stratigraphic variability visible in the outcrops. The outcrop-based geocellular model was scaled up for seismic modeling by addition of a similar but simpler model below it as well as acoustically constant buffer layers above and below to make a final model 110 m thick. Based on laboratory velocity and density measurement from outcrop plugs, an average acoustic impedance value for each facies was used to convert the<br>facies model into an impedance volume with appropriate values. The 3-D synthetic seismograms were produced using both a 1-D vertical-convolution algorithm and a 3-D exploding-reflector algorithm at 30, 60, 120 and 240 Hertz (Hz) peak frequencies. The 30 Hz models show no apparent seismic impact of the underlying geological model. At 60 Hz and above vertical and lateral variation in reflector character is observed. This variation, when mapped, is a useful approximation of stratigraphic variation across the geocellular model. Current acquisition and processing techniques, providing peak frequencies around 30 Hz, do not appear to provide data from which Khuff stratigraphic variation may be detected. Based on this study it is reasonable to assume that improvements in acquisition and processing, raising the peak frequency to around 60 Hz, may provide data from which such interpretations can be made.

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/content/papers/10.3997/2214-4609-pdb.246.261
2008-01-03
2024-03-28
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