Schlumberger

Technical Paper: Building a Near-Surface Velocity Model in the South Ghadames Basin: Surface-Wave Inversion to Solve Complex Statics

Society: SEG
Paper Number: 1133
Presentation Date: 2013
 

Abstract:

The South Ghadames basin, Libya, near-surface geology consists of a Tertiary-Cretaceous carbonate layer overlying Jurassic clastics. This leads to a strong velocity inversion in the near surface that, combined with the absence of a stable refractor, generates serious statics issues in an area where low relief structures are expected. We propose to use surface-wave analysis and inversion as a tool to build a geologically consistent near-surface velocity model. The geology makes the surface-wave inversion particularly challenging because of the superposition of different modes (Rayleigh, Lamb, and S-guided). To combat these challenges, a new inversion approach, which is able to deal with different modes, was applied.

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