[S-SS03] New trends in data acquisition, analysis and interpretation of seismicity

[SSS03-02] Directly Polarity Correction for Microseismic Event Location Using Hilbert Transform

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*Zhiyi Zeng¹、Peng Han¹、Jincheng Xu¹、Ying Chang² (1.Southern University of Science and Technology, Shenzhen, China、2. Institute of Mining Engineering, BGRIMM Technology Group)

キーワード：Microseismic event, Migration diffraction stacking (MDS) imaging, Polarity correction

Microseismic events can delineate fault and fracture distribution in natural and induced earthquakes. Migration diffraction stacking (MDS) imaging implicitly assumes that the traveltime corrected seismic waveforms will stack coherently, making it a practical method to detect and locate microseismic events simultaneously. However, the polarity reversal caused by source radiation patterns interferes with the coherence stack. We develop a method of directly transforming the original signal polarity to consistency using the Hilbert transform, rather than aiming to identify and correct the polarity. The method can refocus the dispersed energy and preserves time-domain noise incoherence to suppress spatial-domain imaging noise. We have demonstrated its effectiveness with synthetic data. Application to real data from the coal-bed methane (CBM) fracture experiment locates more microseismic events in the practical fracturing depth. Since the polarity correction is completed in the data domain before imaging, this method is adapted to various seismic monitoring projects.

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