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| Phase matching technology and its application in suppressing OBN reverberation |
| Jian TAO1, Bin LI2, Xia-Wan ZHOU1 |
1. College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China;
2. Shanghai Geophysical Branch,SINOPEC Offshore Oilfield Services Company,Shanghai 201208,China |
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Abstract By comparing the phase difference between OBN hydrophone data (P) and geophone data (Z),the similarity coefficient criterion is improved and introduced into the phase matching of OBN data,so as to eliminate the phase difference between the two geophones data.On the basis of frequency matching,the amplitude matching of geophone data is carried out by matching filtering method,and then the dual-sensor data PZ are merged to suppress the reverberation.The theoretical model test and actual data processing show that the improved similarity coefficient method can correct the phase difference of land geophone data quickly and accurately,and the PZ combination has achieved good results in suppressing the reverberation.
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Received: 03 January 2019
Published: 10 April 2019
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Seismic theoretical model of submarine joints
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Seismic wavelet for synthetic seismic recording
a—zero phase wavelet;b—mixed phase wavelet
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Double detector simulated by OBN theory model(Channel of the 201st record)
a—before phase correction of zero-phase wavelet model;b—zero phase wavelet model phase correction;c—pre-phase correction of mixed phase wavelet model;d—phase correction of mixed phase wavelet model
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Contrast before and after phase correction of dual geophones with different
a—the 100th;b—the 250th
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Phase correction angle of common detection point track collection land data
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Contrast before and after land inspection matching
a—hydrophone data;b—geophone data;c—matching results of geophone data
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Contrast of suppressing reverberation effect between Hydrophone and Geophone
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Spectrum comparison of combined overlapping data of Hydrophone and Geophone
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Contrast of suppressing reverberation effect of actual common geophone data
a—suppression of Hydrophone records before reverberation;b—consolidated records of Hydrophone and Geophone after suppressed reverberation
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