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The Improvement of Traditional Wavefield Storage Method in 3D FWI
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Full waveform inversion (FWI) needs quite a lot of hard disk space because of storing the source wavefield. To avoid storing source wavefield , people often use efficient boundary storage strategy. In the case of three dimension, however, this method still has much storage. In order to improve this problem, we improved the storage method by compressing the wavefield on the basis of the efficient boundary storage strategy. We compress the wavefield of each moment of boundary and the wavefield of the last moment of target area. When calculating the gradient, the compressed wavefield are decompressed to reconstruct the source wavefield, and delete the used wavefield along with the reconstruction. Through this process to achieve the purpose of reducing storage. A 3D simulating model and four shots field data of a sea are used to demonstrate the feasibility and effectiveness of this improved method. By comparing the storage of traditional method and improved method, the results show that the improved storing method could decrease considerable storage in 3D FWI, and has a better effect in real seismic data.