High-resolution imaging: An approach by incorporating stationary-phase implementation into deabsorption prestack time migration
| Autor: | Jin Wang, Jincheng Xu, Li Zhengwei, Linong Liu, Jianfeng Zhang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Fresnel zone
010504 meteorology & atmospheric sciences Wave propagation business.industry Aperture High resolution Prestack 010502 geochemistry & geophysics 01 natural sciences Geophysics Optics Geochemistry and Petrology Stationary phase business Dispersion (water waves) High resolution imaging Geology 0105 earth and related environmental sciences |
| Zdroj: | GEOPHYSICS. 81:S317-S331 |
| ISSN: | 1942-2156 0016-8033 |
| DOI: | 10.1190/geo2015-0543.1 |
| Popis: | We have improved the so-called deabsorption prestack time migration (PSTM) by introducing a dip-angle domain stationary-phase implementation. Deabsorption PSTM compensates absorption and dispersion via an actual wave propagation path using effective [Formula: see text] parameters that are obtained during migration. However, noises induced by the compensation degrade the resolution gained and deabsorption PSTM requires more computational effort than conventional PSTM. Our stationary-phase implementation improves deabsorption PSTM through the determination of an optimal migration aperture based on an estimate of the Fresnel zone. This significantly attenuates the noises and reduces the computational cost of 3D deabsorption PSTM. We have estimated the 2D Fresnel zone in terms of two dip angles through building a pair of 1D migrated dip-angle gathers using PSTM. Our stationary-phase QPSTM (deabsorption PSTM) was implemented as a two-stage process. First, we used conventional PSTM to obtain the Fresnel zones. Then, we performed deabsorption PSTM with the Fresnel-zone-based optimized migration aperture. We applied stationary-phase QPSTM to a 3D field data. Comparison with synthetic seismogram generated from well log data validates the resolution enhancements. |
| Databáze: | OpenAIRE |
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