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Study of Near-Surface Q Value Extraction and Quantitative Amplitude Compensation TechnologyNormal access

Authors: Q. Su, Y. Tian, X. Xu, M. Xiao, J. Wu, H. Zeng and S. Wang
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: Seismic Attenuation A
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800946
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 590.63Kb )
Price: € 20

Summary:
The near surface media often have loosen deposits and strong lateral variations for velocity and thickness in land exploration. The near surface also has serious absorbing effect for seismic wave and serious attenuation for high frequency component. So they will lead to low resolution of seismic records. The space variation and dispersion effect will lead to consistency of wavelet energy and phase, and the stacking imaging effect and fidelity. At present there are many resolution improving methods, including the qualitative methods, for example surface consistent amplitude compensation and deconvolution, and the methods based on stratigraphic absorption compensation methods, for example Q calculation via VSP data or Q scanning. In most of the methods only middle deep and deep formation absorption are taken into account, however, the absorption attenuation effect of shallow near surface with strong lateral velocity and thickness’ variations hasn’t been taken into account. So satisfactory results haven’t been obtained by now. Based on this, in this paper we develop a deterministic quantitative compensation method based on near surface model to realize quantitative Q prediction and time variation and space variation compensation.We have obtained substantial advance in many oil fields by applying this method.


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