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Experiment in the Use of Grouped Shots Using the Common Depth Point Method

The wave picture depends in considerable degree on the surface seismo-geologic conditions. Within the Kuybyshev area beneath the Quaternary low velocity zone occur sediments of the Permian Tatar stage, Jurassic, and Neogene. When vibrations are induced into rocks of Permian, Jurassic, and Tertiary age, a wave picture for rocks of each of these ages is registered. The most simple wave picture is recorded with shots in rocks of the Tatar stage. Low-velocity surface waves have V k = 200-500 m/sec. The wave picture for shots in Jurassic rocks is more complex. Here the surface waves have V k = 800-1200 m/sec. The amplitude of waves D and A reflected from the top of the clastic Devonian and the surface of the crystalline basement are commensurate with the level of sporadic interference. The most complex wave picture is recorded with explosions in Neogene sediments, particularly where their base is on an erosion surface. In addition to the surface waves there are medium-velocity (V k = 1500-3000 m/sec) and high-velocity (5000-10,000 m/sec) wave interferences.