Simulation of seismic responses from fractured MARMOUSI2 model

Abstract

The seismic survey is the common method for oil and gas deposits exploration. The development of modern computer systems provides the possibility of using more and more complicated physical models and numerical methods. The strong heterogeneity of geological media requires the development of new continuum models. The paper is connected with the simulation of seismic waves in fractured media. The govern system of equations of solid media with a discrete set of slip planes and nonlinear viscous-plastic contact conditions on them is formulated. An explicit-implicit numerical method is utilized with an explicit approximation of motion equations and an implicit approximation of the constitutive relations containing a small parameter. The grid-characteristic method on rectangular grids is used to solve the hyperbolic part of the system. We applied the described approach to simulate dynamic processes in the 2D elastic Marmousi2 model. The fractured geological object was placed in the model according to its geological structure. Full-wave stress fields and synthetic seismograms were successfully calculated. The described approach significantly expands the scope of computer simulations.