Fracture Characterization Based on an Acoustic Emission Experiment
D. Xu, F. Zhang, X. Li, G. Zhang and Q. Lin
Event name: 80th EAGE Conference and Exhibition 2018
Session: Microseismic Driven Fracturing And Interferometric Wavefields
Publication date: 11 June 2018
Info: Extended abstract, PDF ( 407.83Kb )
Price: € 20
Characterization of the distribution and development of the fracture is a significant subject in both earthquake seismology and hydraulic fracturing monitoring using microseismic. In this study, we design an acoustic emission (AE) experiment for a shale sample based on the three-point bending test. P-wave arrival time was obtained by means of STA/LTA algorithm and analyzed the waveforms using the Akaike Information Criterion (AIC). The hypocenter is then located and classified into three categories: the C-type source, the S-type source and the T-type source. We perform focal mechanism inversion on the S-type source events using the polarity of first motions at each sensor. The locating result is validated by comparing the fractured shale sample. We find that distribution of shear sources is well consistent with the fracture and the result of focal mechanism inversion is consistent with non-uniform distribution of force in the sample.