煤层水力压裂微震信号P波初至的自动拾取方法

doi:10.13722/j.cnki.jrme.2018.0467

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Abstract In recent years，hydraulic fracturing is an important technique widely used in mining fields for methane exploitation in coal bed，gas drainage and rock burst preventions. In order to improve the speed and accuracy of arrival picks of microseismic P-phase in hydraulic fracturing of coal seam，a new method which combines a multi-threshold wavelet packet transform(MWPT) and an improved Hilbert-Huang transform(IAIC) was developed. The MWPT module has the multi-rules for different frequency bands based on wavelet packet transform method. The IAIC module is applied for speediness and precise determination of P-phase arrival time with two steps：rapid searching and accurate picking. Taking a typical microseismic event with 12 channels as an example，the methods of IAIC，ER，MER，WFM and PAI-S/K were used to pick up the first arrival time and compared to the manual picking results. MWPT method was proved to be applicable for microseismic signals from hydraulic fracturing of coal seam. The SNR has been advanced about 12.67 dB with reserved signal energy eigenvalue of 97.15%. Four methods except PAI-S/K method had the high accuracy in picking microseismic P-phase arrival，especially the IAIC method reduced the error from 34.17 ms to 7.08 ms. Although the methods of ER，MER，WFM are in the same time-window system，and sensitive to the waveform fluctuation，they still lag behind the manual result attributing to selective time-window. Compared to the manual method，IAIC method is more sensitive to signal denoising by MWPT method，with computation cost(0.124 s) and precision(7.08 ms)，the picking error between －10 ms and 10 ms is even up to 62.5%，between －20 ms and 20 ms is up to 100%.

Key words： mining engineering hydraulic fracturing microseismic wavelet packet transform improved Hilbert-Huang transform(IAIC) arrival time picking

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	Articles by authors
	ZHU Quanjie1
	JIANG Fuxing2
	WEI Quande3
	4
	WANG Bo2
	LIU Jinhai1
	LIU Xiaohui1

Cite this article:

ZHU Quanjie1,JIANG Fuxing2,WEI Quande3, et al. An automatic method determining arrival times of microseismic P-phase in hydraulic fracturing of coal seam#br#[J]. , 2018, 37(10): 2319-2333.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0467 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I10/2319

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