The pore structure in heterogeneous reservoirs such as carbonate rock is usually very complex. This complex pore system makes the relationship between the velocity and porosity of the rock highly scattered, so that for the classical two-dimensional rock physics template (RPT) it is not enough to accurately describe the quantitative relationship between the rock elastic parameters of this kind of reservoir and its porosity and water saturation. This paper first presents a method to establish a new three-dimensional (3D) RPT by integrating the Gassmann equation and the porous rock physics model, and use it to characterize the quantitative relation between rock elastic properties and the reservoir parameters including the pore aspect ratio, porosity and water saturation, and to further predict these parameters from the known elastic properties. The results show that the 3D RPT can accurately describe the variations of elastic properties with the porosity, water saturation and pore-structure parameters.


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