Abstract
The migration-based microseismic event location methods using waveform stacking algorithms are widely used for hydro-fracturing monitoring. These methods have the advantage of not requiring the accurate first arrival time around a detected event, which is more suitable for noisy data than classical travel time-based methods. However, accuracy of these methods can be affected under the condition of relatively low signal-to-noise ratio (SNR). Therefore, in order to enhance the location accuracy of microseismic events in a borehole system, we have proposed a migration-based location method using improved waveform stacking with polarity correction based on a master-event technique, which optimizes the combination way of P- and S-wave waveform stacking. This method can enhance the convergence of the objective function and the location accuracy for microseismic events as compared to the conventional waveform stacking. The proposed method has been successfully tested by using synthetic data example and field data recorded from one downhole monitoring well. Our study clearly indicates that the presented method is more viable and stable under low SNR.
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Acknowledgments
This study was co-sponsored by Hubei Provincial Department of Education (Grant No. Q20191307) and Open Fund of Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education (Grant No. K2018-14). The authors gratefully thank the associate editor Prof. Junlun Li and two anonymous reviewers for their constructive comments and suggestions that have significantly improved this manuscript.
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Mao, Q., Azeem, T., Zhang, X. et al. A migration-based location method using improved waveform stacking for microseismic events in a borehole system. Acta Geophys. 68, 1609–1618 (2020). https://doi.org/10.1007/s11600-020-00488-z
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DOI: https://doi.org/10.1007/s11600-020-00488-z