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Numerical Simulation of Seismic Wave Propagation in Fluid-Saturated Geological Media by the Grid-Characteristic Method
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Geomodel 2019, Sep 2019, Volume 2019, p.1 - 5
Abstract
Summary
Nowadays the seismic survey technology is widely used for the oil and gas fields exploration. In connection with the recent discovery of unconventional deposits, the task of improving its methods and approaches is important. Mathematical modeling may allow us to calculate seismic responses from the geological medium with a given structure in the reasonable time. Due to the increase of the computational power of HPC systems, more and more complex mathematical models can be used: acoustic, elastic, averaged fractured, etc. In this paper the process of the seismic wave propagation in fluid-saturated geological media is investigated. The Dorovsky model is used, which takes into account the porosity and other properties of the elastic skeleton and the saturating fluid. The authors expanded the scope of the numerical grid-characteristic method, previously well-proven in problems of seismic wave propagation in acoustic, elastic and fractured media. A two-dimensional formulation of the seismic exploration problem is considered. Formulas for the interior points of the integration domain were obtained, as well as the boundary condition on the “day surface”, in explicit form. Calculations illustrating the differences in the wave fields when using acoustic, elastic and fluid-saturated models for describing geological media were carried out.
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