![]() As a result they often accept a petrophysical evaluation that is over- simplified for use in seismic applications. A common misunderstanding, among Geophysicists, is that the small scale changes in mineral and fluid fractions have little or no impact at seismic scale. In reality, these properties are estimated empirically or semi-empirically and, therefore, carry intrinsic uncertainty. The input petrophysical properties are often used as if they were implicit and not derived properties and are rarely questioned or reviewed. Rock physics uses the results of a petrophysical evaluation as input, together with the results of laboratory measurements, where available, and combines these using both theoretical and empirical relations to understand how the seismic signal responds to changes in the reservoir properties. Rock Physics analysis is a key stage in seismic based reservoir characterization studies, which attempt to determine the most plausible 3D distribution of the reservoir and the fluids they contain.
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