NDLI: Offset continuation (OCO) ray tracing using OCO trajectories

Content Provider	Springer Nature Link
Author	Coimbra, Tiago A. vais, Amélia Schleicher, Jörg
Copyright Year	2012
Abstract	Offset continuation (OCO) is a seismic configuration transform designed to simulate a seismic section as if obtained with a certain source-receiver offset using the data measured with another offset. Since OCO is dependent on the velocity model used in the process, comparison of the simulated section to an acquired section allows for the extraction of velocity information. An algorithm for such a horizon-oriented velocity analysis is based on so-called OCO rays. These OCO rays describe the output point of an OCO as a function of the Root Mean Square (RMS) velocity. The intersection point of an OCO ray with the picked traveltime curve in the acquired data corresponding to the output half-offset defines the RMS velocity at that position. We theoretically relate the OCO rays to the kinematic properties of OCO image waves that describe the continuous transformation of the common-offset reflection event from one offset to another. By applying the method of characteristics to the OCO image-wave equation, we obtain a raytracing-like procedure that allows to construct OCO trajectories describing the position of the OCO output point under varying offset. The endpoints of these OCO trajectories for a single input point and different values of the RMS velocity form then the OCO rays. A numerical example demonstrates that the developed ray-tracing procedure leads to reliable OCO rays, which in turn provide high-quality RMS velocities. The proposed procedure can be carried out fully automatically, while conventional velocity analysis needs human intervention. Moreover, since velocities are extracted using offset sections, more redundancy is available or, alternatively, OCO velocities can be studied as a function of offset.
Starting Page	65
Ending Page	82
Page Count	18
File Format	PDF
ISSN	00393169
Journal	Studia Geophysica et Geodaetica
Volume Number	56
Issue Number	1
e-ISSN	15731626
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-08-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	seismic processing data mapping ray tracing velocity analysis RMS velocity Meteorology/Climatology Geophysics/Geodesy Structural Geology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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