Author(s)

Victor Pereyra and Mihai Popovici

Abstract

We combine a fast eikonal solver with two optimization algorithms to locate and map fractures caused by injection in the secondary recovery of hydrocarbons. The data used is arrival times on wells, although the method is applicable to other problems and acquisition geometries. We describe the problem and the various processes involved and illustrate the numerical behavior with a synthetic data example. 1 Introduction We consider the problem of locating and mapping fractures produced by forced injection in a reservoir. The initial as- sumption is that the velocity of propagation of elastic waves is known on a mesh covering the area under investigation and that geopliones are placed on wells to passively listen to hy- dro cracking. The medium will be assumed to be isotropic. The measured quantities are ti

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