Abstract
Abstract Shale gas is primarily concentrated in nanopores extensively distributed in shale. The elastic properties of nanopores are significantly different from those of pores of larger sizes due to surface effects. How nanopores and adsorbed fluids affect the overall elastic properties of rock is rarely studied. Based on a recently developed nano-elasticity theory, a new method for calculating elastic modulus of nanoporous media considering adsorption is proposed by performing a detailed analysis on the relationship of surface adsorption with surface effects. The surface parameters of nanopores (pore radius, surface elastic moduli) are converted to adsorbed gas ratio and adsorbed gas elastic moduli. The proposed method is then used in rock physics modeling to estimate the elastic properties of nanoporous shale. The quantitative relationships of the effective velocities with adsorbed gas ratio, adsorbed gas elastic modulus and porosity of the shale are established, respectively. An important finding is that the elastic properties of nanoporous shale can be enhanced by increasing adsorbed gas ratio and adsorbed gas elastic moduli. A comparison between the theoretical model with laboratory data and the well data is performed and the results indicate that they are in good agreement. The results in this paper may provide certain insights on rock physics for the quantitative characterization of elastic properties of shale.
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