EXPERIENCE OF KINEMATIC INTERPRETATION OF DEEP GPR DATA
O.A. Gulevich1, L.B. Volkomirskaya1, E.P. Kaygorodov2
1Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Moscow, Russia
2V.I. Shpilman Research and Analytical Center for the Rational Use of the Subsoil, Tyumen, Russia
Keywords: ECDP, electromagnetic CDP, deep GPR, electrical resistivity, virtual well, velocity analysis
Abstract
Experimental studies were carried out in the permafrost zone using the method of reflected electromagnetic waves using multi-offset data acquisition with common distance-point (Electromagnetic CDP, ECDP). Comparison of the results of processing several ECDP hodographs taken within the same site at a distance of up to 6 km, namely the distribution of vertical velocity in the time interval 0-10 μs, demonstrates common features in the structure of permafrost and the electrical properties of the underlying rocks, which correspond to drilling data. Based on the velocity analysis data, a geophysical model of the section at the CDP point was built - a “virtual well” 500 meters deep with a step of 50 ns (2-5 m), describing the change in the electrical resistivity parameter with depth.
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