Schlumberger

Technical Paper: Mixed-modes - A Source for Improved Imaging and Coherent Noise

Society: EAGE
Paper Number: I048
Presentation Date: 2011
 

Abstract

Most seismic processing and imaging are limited to pure wave modes: pure P-waves for recorded P-data and C-waves (P converted to S at reflection point) for recorded shear-waves. It has, however, been known for a long time that other mixed-wave modes are also recorded. The mixed-wave modes, which can be any combination of P- and S-waves, appear as coherent noise in conventional processing, but could also be imaged to give additional information about the subsurface. In this paper, we will review the geophysics of mixed modes, how they can be identified, and present a case study where the same part of the subsurface is imaged by mixed and pure modes.

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