The anti-correlation method for removing harmonic distortion in vibroseis slip-sweep data*
Zhang Hong-Jing1, Zhou Hui1, Abd El-Aziz Khairy Abd El-Aal2, and Zhang Jie1,3
1. State Key Laboratory of Petroleum Resource and Prospecting, CNPC Key Lab of Geophysical Exploration, China University of Petroleum, Changping 102249, China.
2. National Research Institute of Astronomy and Geophysics (NRIAG), Department of Seismology, Helwan 11722, Cairo, Egypt.
3. Sinopec Geophysical Research Institute, Jiangning 210014, Nanjing, China.
Abstract The slip-sweep technique is one of the high-efficiency, high-fidelity, and environmental vibroseis seismic prospecting techniques which consists of a vibrator group sweeping without waiting for the previous group’s sweep to terminate. The cycle time can be reduced drastically and hence the production effi ciency can be increased signifi cantly but harmonic distortion of one sweep will leak into the record of the other sweep. In this paper,we propose an anti-correlation method for removing harmonic distortion in vibroseis data. This method is based on decomposition of the ground force signal into fundamental and harmonic components. Then the corresponding anti-correlation operator can be computed to estimate the energy of each harmonic after correlating the vibroseis data with the corresponding harmonic component. Finally, the vibroseis harmonic noise to be removed can be obtained by subtracting the extracted harmonic noise from the traces of the previous group’s sweep. The advantage of the proposed method is that it can process both uncorrelated and correlated vibroseis seismic data. Moreover, the algorithm is simple, stable, and computationally fast. Especially, the signifi cant contribution of this method is a considerable reduction in the harmonic without any alteration of the desired signals. The method was tested on both synthetic and field data sets to validate the good harmonic noise suppression results.
This work was supported by the Sinopec Service Company and China National Petroleum Corporation.
Cite this article:
ZHANG Hong-Jing,ZHOU Hui,Abd El-Aziz Khairy Abd El-Aal et al. The anti-correlation method for removing harmonic distortion in vibroseis slip-sweep data*[J]. APPLIED GEOPHYSICS, 2012, 9(2): 159-167.
2012, Vol. 9 
