A Novel Technology for Deep Seismic Sounding by the Use of Powerful Mobile Seismic Vibrators and Self-Contained Recorder

摘要

Interest in investigations of the deep structure of the Earth's crust has quickened in the past few years. However, deep seismic sounding performed with the use of boreholes, big shots and less-than-conditioned spreads is connected with its technological inefficiency, high cost, risk and in many cases with impossibility of performance for reasons of ecology. We present an up-to-date DSS technology that is free from negative limitations, inherent in classical technologies, and so allows much room for its application under any conditions, including industrial estates, reserves, hydroelectric power stations, atomic power-stations, and so on. The technology is based on detailed deep seismic multiwave studies using multiple overlapping spreads and powerful seismic vibrators, which generate seismic waves of high radiation stability, and also remote self-contained recorders. Powerful 40-60 ton vibrators provide vibroseis records at 300 to 350 km that compare well with those of powerful 3 to 5 ton trotyl explosions in wells and basins. They were strictly checked, and at present they are successfully used in studying the deep structure of the Earth's crust and upper mantle in the Altai-Sayan earthquake-risk region and along the geotraverse in the north-east of Russia.