Abstract
On the territory of north-eastern Russia unexplored by seismic exploration geophysical profiles about 3 000 km long were surveyed. On these profiles DSS data interpreted by conventional methods and seismic tomography gave the first reliable idea of the structure of the earth’s crust down to depth of 45 km. The earth’s crust presents itself typically continental. Seismic-tomography processing of CR data and first CDP waves made it possible to study the structure of the upper heterogeneous earth’s crust in detail and forecast more than ten new ore knots in it, two zones of oil and gas possibilities and a local uplift being of interest in the context of prospecting for oil and gas.The investigation results show that the most reliable information about the structure of the earth’s crust and upper mantle can be mainly obtained by the conventional DSS method and about the structure of the upper earth’s crust in ore areas by high-density observations of the near-field first waves and their processing and interpretation by seismic tomography.
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