Examination of the optimum XY value by ray tracing

摘要

The ability to recognize undetected layers in the generalized reciprocal method (GRM) depends on the optimum XY value. The determination of the optimum XY value, in turn, requires that some lateral variations exist in the refractor. Since lateral subsurface variations may not be just on the refractor, different locations and aspects of lateral variations may invalidate the usefulness of the optimum XY value. The optimum XY value is examined through velocity models having different types of lateral variations. Accurate traveltime data are generated by a first-arrival ray-tracing routine. The results of the study indicate that the integrity of the optimum XY value may be violated because of the various types of lateral variation.