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�ؼ����� б��   ȥ��   ������   ��С���˷���   �ؿ�Ƶ��  
De-ghosting of variable-depth streamer data based on least squares inversion in Radon domain
ZHANG Wei1, HAN Li-guo1, LI Hong-jian2, YE Lin1, ZHANG Qi1
1. College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China;
2. Geophysical Research Institute of SinoPEC, Nanjing 211103, China
Abstract:

The ghost notches limited the frequency bandwidth and resolution of seismic records in variable-depth streamer data, which increase the difficulties of inversion and interpretation of seismic data. By suppressing the ghost, high-resolution broadband data can be obtained. Based on the de-ghosting method of flat-streamer in Radon domain, combining the characteristics of the ghost varied with offset, the authors derive the inverse transform operator for primary wave and ghost wave in frequency-Radon domain and build the new relationship between the total wavefield at the cable and the up-going wavefield at the sea surface. The up-going wavefield at the sea surface can be calculated by the least squares inversion method, and can be extrapolated to obtain the deghosted data at the cable. By considering the influence of emerging angle and offset on the ghost delay time, the error in the ghost delay time estimation is compensated. This method does not need to perform inverse iteration to obtain the optimal ghost delay time, which improves the computational efficiency. Test results on synthetic and field data show that the proposed approach can remove ghost better and broaden the bandwidth of seismic data.

Keywords: variable-depth streamer   de-ghosting   Radon domain   least squares inversion   broaden bandwidth  
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DOI: 10.3969/j.issn.1004-5589.2017.02.026
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