Attenuating Multiples in Seismic Data of Low Signal‐Tonoise Ratio using Optimal Beamforming

Hong, Fangzhou; Hu, Tianyue; Zhang, Wen-Po; Liu, Dongqi

doi:10.1002/cjg2.611

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…Now, the idea of beam forming is widely used in other wave areas, such as microwave [12] , ultrasonic [13] and light-wave [14] . Vibrator array [4] with solo frequency signals was used to testify the existence of directional seismic wave. Based on above research, we propose a method to make sweep frequency seismic waves concentrate in certain direction.…”

Section: Theorymentioning

confidence: 99%

Boosting Signal to Noise Ratio of Seismic Signals Using the Phased-Array Vibrator System

Tao

Lin

et al. 2006

Chinese J. Geophys.

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When noise in the field is very strong, we can not get data with proper signal to noise ratio (SNR) even if combination vibroseis is used. To solve this problem we proposed to apply a phased‐array vibrator, which can form a directional seismic wave. We have made numerical simulation of multi‐track seismograms and computed reflected waves’ SNR for combination and phased‐array sources on a given horizontal stratified model. The result shows that the average SNR of reflected waves increases by 1.54_9.90dB with respect to the combination source when 4,8,15 and 20‐unit phased‐array vibrators are used. We conclude that phased‐array source is competent to improve seismic signal SNR. Moreover, the phased‐array source can boost SNR obviously when more vibrators are applied but there is no similar result for the combination source.

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Section: Theorymentioning

confidence: 99%

Boosting Signal to Noise Ratio of Seismic Signals Using the Phased-Array Vibrator System

Tao

Lin

et al. 2006

Chinese J. Geophys.

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“…In 2002, Jun Lin et al [5] developed a new electromagnetic source -phasedarray vibrator system (PAVS), which can generate directional wave and increase SNR of reflected signals. The alternative solution is processing data with optimal beamforming [6,7] or illumination analysis [8∼11] method.…”

Section: Introductionmentioning

confidence: 99%

SNR Improvement of Seismic Signals in Different Time Delays

Tao

Lin

Chen

2009

Chinese J of Geophysics

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When noise in the field is strong, it's difficult to obtain high SNR seismic data with single or combination vibrator. So phased-array vibrator system (PAVS), which can form directional seismic beam, was developed. Because the orientation of the directional seismic wave is dependent on the time delay, the time delay is a dominant factor for PAVS to boost SNR of reflected signals. 3-unit PAVS is able to improve SNR 6.53∼9.54 dB based on theoretical analysis. Field seismic data were obtained for time delays of 0, 0.802, 0.384, 0.241, 0.174 ms and 0.123 ms, respectively. Using the raw data of different time delays, power spectrums of reflected seismic signals were calculated, and then quantitative SNR improvement was obtained. Compared to the case of single source, SNR increased 3.3150, 8.0150, 6.0547, 5.0278, 4.5383 dB and 4.0364 dB. Compared to the case of combination source, SNR increased 0, 4.7000, 2.7397, 1.7128, 1.2233 dB and 0.7214 dB. On the basis of theoretical analysis and the results of field experiment, it is concluded that directional seismic beam technique is useful to SNR improvement; SNR varies with time delay; proper time delay can raise SNR of reflected signals significantly.

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Equivalent Offset Method and Its Application

Wang

Yin

Liu

et al. 2007

Chinese J of Geophysics

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When the geologic structure is complex, the dip of the layer is large or the lateral lithology change is abrupt, the reflection waves are weak with low signal-noise ratio, even unable to be received. Routine imaging method is invalid for such data, but the equivalent offset migration based on the scattered waves is viable. The method consists of two steps: first is a gathering process that forms common scatter point gathers; second is a focusing process that applies a simplified Kirchhoff migration on the CSP gathers. Based on examples of numerical simulating and sea data, the paper shows that the method of scattering image is widely and practicably valuable in processing of complicated geologic structure and low signal-noise ratio seismic data.

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Attenuating Multiples in Seismic Data of Low Signal‐Tonoise Ratio using Optimal Beamforming

Cited by 6 publications

References 15 publications

Boosting Signal to Noise Ratio of Seismic Signals Using the Phased-Array Vibrator System

Boosting Signal to Noise Ratio of Seismic Signals Using the Phased-Array Vibrator System

SNR Improvement of Seismic Signals in Different Time Delays

Equivalent Offset Method and Its Application

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