APPLICATION OF DELAY AND INTERCEPT TIMES IN THE INTERPRETATION OF MULTILAYER REFRACTION TIME DISTANCE CURVES*
- 1 June 1956
- journal article
- Published by Wiley in Geophysical Prospecting
- Vol. 4 (2) , 112-130
- https://doi.org/10.1111/j.1365-2478.1956.tb01399.x
Abstract
The well known quantities, delay and intercept times, can be made fully useful in the interpretation of multilayer refraction problems dealing with small undulating dips.The identification of the individual refractors is made by the use of reciprocal and intercept times and by applying an additional and useful relationship, namely that the delay time profile between two shot‐points should match the half‐intercept time profile when calculated using the true velocity of the refractor.With a suitable arrangement of shot‐points this relation permits us to obtain the true horizontal velocity of a refractor from one direction of shooting only.Presentation of the refraction results in the form of time sections, similar to those used in reflection surveys, is often desirable. These sections can be converted easily into depth sections, once the overburden velocities are defined.The use of the method is limited not only by the dip, but also by the depth of the refractor. Deep refractors can be, however, worked out by this method, by reducing a multilayer problem to that of two layers, using again the delay times.Keywords
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