Rock physics represents the link between geologic reservoir parameters (e.g., porosity, clay content, sorting, lithology, saturation) and seismic properties (e.g., VP/VS, density, elastic moduli). Rock physics models can either be used to interpret observed sonic and seismic velocities in terms of reservoir parameters, or they can be used to extrapolate beyond observed range to predict certain “what if” scenarios in terms of fluid or lithology substitution. Rock physics models can also be used to estimate expected seismic properties from observed reservoir properties.

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