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Near-Surface Characterization Using Simultaneous Joint Inversion of Refracted and Surface Waves – A Case Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
Near-surface characterization is an essential step of seismic processing, in particular for land data. Information on the shallow portion of the subsurface is usually extracted from the travel-time of the first arrivals, producing a compressional velocity (Vp) model by means of a tomographic process. In addition, an independent and robust source of information is represented nowadays by the surface waves, which can be exploited for estimating a high resolution shear velocity (Vs) model of the shallow layers.
These two independent source of information are very appealing for an integrated approach, which can help in reducing the uncertainties associated with the near-surface model building. The Simultaneous Joint Inversion (SJI) framework is a quantitative integration scheme, where the two geophysical measurements are taken into account in a single minimization problem, whose output is a velocity model that honors the data of both the domains and the mutual consistency of Vp and Vs.
The SJI of refracted waves and surface waves is particularly appealing for complex geological settings, where outperforms the industry standard, as demonstrated in this paper with a field example from the Middle East.