On the identification and construction of reflected refractions
R. Bortfeld and H. Hürtgen
Journal name: Geophysical Prospecting
Issue: Vol 8, No 1, March 1960 pp. 12 - 24
Info: Article, PDF ( 745.11Kb )
Reflected refractions are considered as the limiting case for ordinary steeply dipping reflections. Particularly, reflected refractions may be constructed (migrated) according to the same principles as ordinary reflections. In view of the inherent inaccuracy of the velocity data, there is no discrimination between reflected refractions and other steep events by methods of construction. Velocity determinations from reflection data also show a continuous transition from steep reflections to reflected refractions. I.e., it is impossible to discriminate by seismic ray methods between reflected refractions and other steep events.
If disturbing, steep events may be attenuated to a great extent by special shot and geophone set-ups. Also in this connection it is unnecessary to distinguish between reflected refractions proper and steep reflections.
It seems to be more rational to consider steep events as ordinary steep reflections in the beginning of a survey, because otherwise real structural indications might possibly be thrown away.