Seismic shot-encoding schemes for waveform inversion
| Autor: | Ying Rao, Edwin Fagua Duarte, João M. de Araújo, Carlos A. N. da Costa, Yanghua Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Geochemistry & Geophysics
seismic tomography 0211 other engineering and technologies 0404 Geophysics 02 engineering and technology FWI Management Monitoring Policy and Law 010502 geochemistry & geophysics 01 natural sciences 0905 Civil Engineering Industrial and Manufacturing Engineering shot encoding TOMOGRAPHY Encoding (memory) waveform tomography 021101 geological & geomatics engineering 0105 earth and related environmental sciences Science & Technology Geology Geophysics Shot (pellet) Physical Sciences simultaneous-shot scheme Waveform inversion Algorithm |
| Zdroj: | Journal of Geophysics and Engineering. 17:906-913 |
| ISSN: | 1742-2140 1742-2132 |
| DOI: | 10.1093/jge/gxaa051 |
| Popis: | A shot-encoding technique can be used in seismic waveform inversion to significantly reduce the computational cost by reducing the number of seismic simulations in the inversion procedure. Here we developed two alternative shot-encoding schemes to perform simultaneous-sources waveform inversion. The first scheme (I) encodes shot gathers with random-phase rotations applied to seismic traces. The second scheme (II) encodes shot gathers with random static time shifts. The well-known polarity encoding scheme (III) is just a special case of the random-phase rotation scheme. The second scheme is a variation of the conventional static shift encoding (IV), but the static time shifts in the second scheme are limited to one period of the dominant frequency. All encoded shot gathers are added up into a single super-shot gather for seismic waveform inversion. We perform the time-domain waveform inversion, using these shot-encoding schemes in conjunction with a restarted L-BFGS algorithm in the iterative inversion. The effectiveness and efficiency analyses demonstrate that the two shot-encoding schemes (I and II) proposed in this paper may improve the convergence of the iterative inversion, reduce the crosstalk effect among shots and consequently produce a subsurface velocity model with a high resolution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|