Abstract
Petrophysical properties are important characteristic parameters of reservoir quality . Rock physics models provide the link between elastic parameters and reservoir properties of interest. Pre-stack seismic inversion is an efficient approach to obtain these petrophysical parameters. This study proposes a direct estimation method of petrophysical properties based on AVO inversion. Firstly, a linear regression analysis of the well data is conducted and the rock physics model is obtained. Secondly, we derived the reflection coefficient approximate equation in terms of porosity, shale content and density through the incorporation of the rock physics model into the linear expression of Aki’s reflection coefficient. The equation establishes the theory foundation for the inversion of reservoir properties. Finally, we introduce a robust AVO inversion procedure to invert for reservoir parameters directly. The AVO inversion of the model and real data shows that the proposed inversion method can obtain reliable reservoir parameters from the seismic data directly.
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