Automatic pickup of arrival time of channel wave based on multi-channel constraints

摘要

Accurately detecting the arrival time of a channel wave in a coal seam is very important for in-seam seismic data processing.The arrival time greatly affects the accuracy of the channel wave inversion and the computed tomography (CT) result.However,because the signal-to-noise ratio of in-seam seismic data is reduced by the long wavelength and strong frequency dispersion,accurately timing the arrival of channel waves is extremely difficult.For this purpose,we propose a method that automatically picks up the arrival time of channel waves based on multi-channel constraints.We first estimate the Jaccard similarity coefficient of two ray paths,then apply it as a weight coefficient for stacking the multichannel dispersion spectra.The reasonableness and effectiveness of the proposed method is verified in an actual data application.Most importantly,the method increases the degree of automation and the pickup precision of the channel-wave arrival time.