DBPapers
DOI: 10.5593/sgem2012/s06.v2002

APPLICATION OF FINITE-DIFFERENCE REFRACTION MIGRATION TO STUDY OF THE EARTH CRUST STRUCTURE

O. VERPAKHOVSKA, V. PILIPENKO, E. PYLYPENKO
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 545 - 554 pp

ABSTRACT

Migration is one of the important procedures of a seismic data processing because gives
an image of the deep geological structure from original observed wave fields. Reflected
waves usually are basic for the migration procedures, but wide-angle data are observed
at large offsets where it is impossible to identify and trace the reflected waves. In this
case the using of refracted waves can be useful.
The depth image of the research region can be result of both kinematic and dynamic
refraction migration. The kinematic migration, in this case is applied for the defining of
refracting boundary depth and velocities in the covering and the refracting layers.
Preliminary velocity model is necessary input information for the migration. Then the
dynamic refraction migration is based on the result of kinematic migration and gives the
image of the depth section with characteristics of observed wave field. Thus proposed
method of seismic migration is self-sufficient because doesn’t require any additional
methods of seismic data processing to obtain preliminary velocity model of
environment and the depth image.
Efficiency and possibilities of the application of the proposed refraction migration
method for study earth crust structure are demonstrated on examples.

Keywords: seismic data, kinematic and dynamic refraction migration, finite-difference
method, depth image