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http://dx.doi.org/10.7582/GGE.2020.23.1.038

Acoustic Full-waveform Inversion Strategy for Multi-component Ocean-bottom Cable Data  

Hwang, Jongha (Seoul National University, Dept. of Energy Systems Engineering)
Oh, Ju-Won (Jeonbuk National University, Dept. of Resources and Energy Engineering)
Lee, Jinhyung (Seoul National University, Dept. of Energy Systems Engineering)
Min, Dong-Joo (Seoul National University, Dept. of Energy Systems Engineering)
Jung, Heechul (POSCO INTERNATIONAL, E&P Division, Geology and Geophysics Department)
Song, Youngsoo (Jeonbuk National University, Dept. of Resources and Energy Engineering)
Publication Information
Geophysics and Geophysical Exploration / v.23, no.1, 2020 , pp. 38-49 More about this Journal
Abstract
Full-waveform inversion (FWI) is an optimization process of fitting observed and modeled data to reconstruct high-resolution subsurface physical models. In acoustic FWI (AFWI), pressure data acquired using a marine streamer has mainly been used to reconstruct the subsurface P-wave velocity models. With recent advances in marine seismic-acquisition techniques, acquiring multi-component data in marine environments have become increasingly common. Thus, AFWI strategies must be developed to effectively use marine multi-component data. Herein, we proposed an AFWI strategy using horizontal and vertical particle-acceleration data. By analyzing the modeled acoustic data and conducting sensitivity kernel analysis, we first investigated the characteristics of each data component using AFWI. Common-shot gathers show that direct, diving, and reflection waves appearing in the pressure data are separated in each component of the particle-acceleration data. Sensitivity kernel analyses show that the horizontal particle-acceleration wavefields typically contribute to the recovery of the long-wavelength structures in the shallow part of the model, and the vertical particle-acceleration wavefields are generally required to reconstruct long- and short-wavelength structures in the deep parts and over the whole area of a given model. Finally, we present a sequential-inversion strategy for using the particle-acceleration wavefields. We believe that this approach can be used to reconstruct a reasonable P-wave velocity model, even when the pressure data is not available.
Keywords
acoustic full-waveform inversion (AFWI); ocean-bottom cable (OBC); multi-component data; sequential inversion strategy;
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