Seismic Interpretation based on Improved Tight Sandstone Reservoir Rock Physics Model

Summary The deep tight sandstone reservoir has the characteristics of strong heterogeneity, complex lithology and reservoir space. Different pore structures have a great influence on the elastic parameters of the tight sandstone reservoir, which makes the conventional rock physics model unable to get the accurate elastic parameters of reservoir. To solve this problem, this paper improves the construction method of conventional tight sandstone rock physics model based on the linear fitting method and Mori-Tanaka model, obtains more reasonable shear wave velocity, fracture weakness parameters and pore structure parameters. The relationship between pore structure parameters and elastic parameters is obtained through rock physics analysis, and then combine it with the prestack seismic inversion results to quantitatively characterize of pore structure of deep sandstone reservoirs. The effectiveness and accuracy of the rock physics model are verified by the application results from Sichuan Basin in China, which can provide theoretical and practical guidance for further exploration of deep tight sandstone gas reservoirs.