Complex of high-frequency well seismic methods for detailed study of rock mass

 International Conference on Engineering Geophysics, Al Ain, United Arab Emirates, 9-12 October 2017

Nikita Ragozin, Vladimir Ignatev, Andrey Konkov, and Alexander Oshkin

Seismic survey is the most common geophysical method for studying the structure of rocks that provides convincing and fairly reliable results when carrying out geological
exploration (depths up to 3000 m and more). The frequencies of the recorded signal during such studies exceed 100 Hz infrequently and / or insignificantly, what nevertheless allows successful solution of exploration tasks. When carrying out surveys on land in the upper part of the section (depths up to 100-150 m), a significant
increase in the resolution (and, correspondingly, in frequencies of the detected signals, what cannot be provided by standard sources operating from the surface) is
required (Figure 1). As a result, on shallow seismic survey sections 1-2 boundaries are commonly allocated. At the same time, the accuracy of boundaries resolution usually is not higher than 1-2 m, and at depths of more than 50 m this value increases enormously. All this leads to the fact that shallow seismic survey often gives only a very rough idea about the structure of the upper part of the section. The ways for increasing a frequency content of a record are following: 1. usage of high-frequency sources; 2.
excitation of signal in wells.

https://library.seg.org/doi/pdf/10.1190/iceg2017-056