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The pre-stack seismic were first conditioned (Singleton, 2009) to ensure they were suitable for input to the seismic inversion. A deterministic simultaneous impedance inversion was then used to invert angle stacks for volumes of P- and S-impedance. These formed the basis of the seismic interpretation.
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Step 1: Prediction of petrophysical properties.
The figure shows the average porosity in the top Realgrunnen to top Fruholmen interval, derived from seismic inversion attributes using the multi-attribute rotation scheme MARS approach developed by Alvarez in 2015. Note the decreasing porosity towards the Northeast, which correlates with an increase in resistivity in this interval.
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Step 2: Rock physics workflow.
A statistical rock physics workflow was then applied to classify the seismic data and determine the most likely litho fluid facies as shown in the figure for the top Realgrunnen to top Fruholmen interval. Note that whereas potentially hydrocarbon bearing bodies can be identified, the saturation within these cannot be determined using seismic alone.
