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Modelling of Fractures Using the Chimera Grid Approach
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 2nd Conference on Geophysics for Mineral Exploration and Mining, Sep 2018, Volume 2018, p.1 - 5
Abstract
Characterization of fractures is important in seismic exploration. In the geophysical context, cracks are usually modelled by the finite-difference method on regular grids. One of the main limitations of this approach is that only fractures parallel to coordinate axes can be modelled. At the same time the use of overset grids (arbitrary rotated rectangular grids that fit each individual model feature) is a very established approach in computational fluid dynamics. This technique is also known as the Chimera grid approach. We applied a similar technique for simulation of seismic cracks. Rectangular overset grids are used in combination with the grids-characteristic method. Our numerical experiments demonstrate that this approach accurately models a set of arbitrary oriented cracks in a complicated geological environment. Comparing to the curvilinear or unstructured grids, this approach has lower computational complexity, because processing of rectangular grids is fast.