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Low-Frequency Phase Estimation for Broadband Seismic Using Tomography Velocity Models
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Summary
We present a method to estimate and correct the phase of broadband seismic data in the low-frequency range using the tomography velocity model as an analogy for subsurface geology. The high-resolution velocity model is obtained from travel-time tomography and therefore has minimal influence from seismic amplitude and phase in the low-frequency range. We derive a phase-correction operator by matching between seismic data and zero-phase synthetics that are built based on a realization of reflectivity obtained from the tomographic inversion. We discuss the robustness of the method with synthetic data and show real data examples demonstrating improved well-tie and impedance inversion results.
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