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Salt Structure Velocity Model Building Based on Signed Multi-Scale Direct Envelope InversionNormal access

Authors: G. Chen, R. Wu and S. Chen
Event name: 81st EAGE Conference and Exhibition 2019
Session: Full Waveform Inversion I
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201900872
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 718.5Kb )
Price: € 20

Summary:
Large-scale salt dome is an important problem in salt structure exploration. The envelope-based inversion method decouples the amplitude and polarity information of the seismic data and improves the convexity of the full waveform inversion objective function by using the envelope alone. However, the lack of polarity information will result in the inversion not able to accurately identify the velocity variation. In order to solve the problem caused by the missing polarity information of the envelope, signed demodulation method has been proposed and developed into a signed multi-scale direct envelope inversion method. In the signed multi-scale direct envelope inversion, the direct envelope derivative improves the linearity between the envelope and model parameters, and the multi-scale inversion strategy increases the convergence of the inversion. The results of numerical experiments on the SEG/EAGE 2-D Salt model and Sigsbee2A model using low-cut source (frequency components below 4 Hz were truncated) verify the promising potential of the method.


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