Low-frequency amplitude and phase simultaneous recovery of conventional geophones data based on joint deployment of high-and low-frequency geophones
Rui Yongjun1, Zou Zhihui2,3, Wang Shengge1, Shang Xinmin1, Zhang Yiming2, Ma Rui2
1. Geophysical Research Institute, Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257022, China;
2. College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China;
3. Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ocean University of China, Qingdao, Shandong 266100, China
Abstract：Seismic signals recorded by conventional geophones have amplitude and phase distortion.Amplitude distortion can be partly recovered by amplitude compensation,but phase distortion still remains uncorrected.This phase distortion causes seismic wave time shift at certain frequency in the time domain and has significant impacts on seismic waves of rich frequency content.Therefore we propose a deconvolution low-frequency recovery method based on the joint deployment of high-and low-frequency geophones.The method utilizes high quality low-frequency data acquired by the low-frequency geophones as the reference and constructs the inverse filter by calculating the spectral ratio between the high-and low-frequency geophone data.The low-frequency amplitude and phase of conventional geophone data will be recovered when deconvolving the inverse filter on the conventional geophone data.We stack all conventional geophone data recovered by individual reference trace to increase the denoising capability and computation stability.Numerical and field data applications show that conventional geophone data recovered by the proposed method match very well with the target low-frequency data,and the proposed method is characterized by easy-use,stable result,and noise-resistance.
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Rui Yongjun, Zou Zhihui, Wang Shengge, Shang Xinmin, Zhang Yiming, Ma Rui. Low-frequency amplitude and phase simultaneous recovery of conventional geophones data based on joint deployment of high-and low-frequency geophones. OGP, 2017, 52(4): 631-643.
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