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In this presentation, we will discuss how a database of published laboratory measurements on dry carbonate samples are used to demonstrate efficient methods of rock physics modelling of carbonates from diverse depositional and diagenetic environments. By focusing on the effects of mineralogy, porosity, pore shapes, and effective stress on elastic properties of limestones and dolomites in a wide 2-45% porosity range, we show that the Vernik-Kachanov rock physics model (RPM) can be successfully used in seismic reservoir characterization of carbonates worldwide.
This rock physics model allows us to consider realistic pore shapes and separate them from the effects of cracks. Because of the very diverse pore geometries typically observed in carbonate lithologies, we subdivide, wherever feasible, the database into carbonate facies and analyze differences and similarities between them in terms of elastic modeling, which may be utilized in AVO inversion-based reservoir characterization efforts worldwide. To emphasize the need for solid rock physics modeling, we generate 1D synthetic scenarios that use our calibrated RPM, extending them into the domains of carbonate facies less represented in our database.
