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Potentially Dangerous Zones Investigation on the Mine Fields by Methods of Ground and Borehole Seismic
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Engineering and Mining Geophysics 2018, Apr 2018, Volume 2018, p.1 - 12
Abstract
In the present paper concerning the results of surface and borehole seismic integration for estimation of undersalt rock massif condition and vertical jointing zone location on the undermined territory with accelerated subsidence of ground surface. Waterproof condition control by surface seismic allows marking abnormal zones related with both the geological specifics and mining impact. At the same time velocity estimation of the cross-section has integral type and its resolution is much lower than for time sections. For reliable abnormal zones location in the potentially dangerous area a significant increase in the carrier frequency of the desired signal is necessary. With this design different borehole seismic methods are tried out. Notably offset and inverted VSP with areal data collection system and crosswell measurements. This approach allows to substantially eliminate the filtering effect of the loose part of the section and obtain the resolution of velocity distributions higher than for ground-based seismic surveys. Interpretation and analysis of vertical and horizontal sections of designed velocity model permitted to reveal and allocate a number of narrow abnormal zones with low P-wave velocity.