Feasibility of joint 1D velocity model and event location inversion by the Neighbourhood algorithm |
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| Authors: | Jaromir Jansky Vladimir Plicka Leo Eisner |
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| Institution: | 1. Department of Geophysics, Faculty of Mathematics and Physics, Charles University in Prague, V Hole?ovi?kách 2, 180 00 Prague 8, Czech Republic;2. Microseismic Inc., 800 Tully Road, Suite 175, Houston, TX 77079, USA |
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| Abstract: | Using a set of synthetic P‐ and S‐wave onsets, computed in a 1D medium model from sources that mimic a distribution of microseismic events induced by hydrofrac treatment to a monitoring geophone array(s), we test the possibility to invert back jointly the model and events location. We use the Neighbourhood algorithm for data inversion to account for non‐linear effects of velocity model and grid search for event location. The velocity model used is composed of homogeneous layers, derived from sonic logging. Results for the case of one and two monitoring wells are compared. These results show that the velocity model can be obtained in the case of two monitoring wells, if they have optimal relative position. The use of one monitoring well fails due to the trade‐off between the velocity model and event locations. |
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