Abstract

When velocity increases linearly with depth, rays are arcs of circles and reflections can come from the upper or lower surface (turning rays) of a dipping plane. In this paper, I examine the behavior of both types of reflections as a function of dip and azimuth. Reflections from the upper surface of a plane behave much like those for a constant velocity medium, the principal difference being movement downdip of a reflection point when the profile is in the strike direction. Reflections from the lower surface of a plane have no constant velocity analog. In addition to downdip movement of a reflection point for a strike line, the turning ray reflections have negative time stepout for a dip line and zero stepout for a profile near 45 degrees from dip.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.