Indication to distinguish the burst region of coal gas from seismic data |
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Authors: | Jian-yuan Cheng Hong-wei Tang Lin Xu Yan-fang Li |
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Affiliation: | (1) Xi’an Research Institute, China Coal Research Institute, Xi’an, 710054, China |
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Abstract: | The velocity of an over-burst coal seam is about 1/3 compared to a normal coal seam based on laboratory test results. This
can be considered as a basis to confirm the area of coal and gas burst by seismic exploration technique. Similarly, the simulation
result of the theoretical seismic model shows that there is obvious distinction between over-burst coal and normal coal based
on the coal reflection’s travel-time, energy and frequency. The results from the actual seismic data acquired in the coal
and gas over-burst cases is consistent with that of the laboratory and seismic modeling; that is, in the coal and gas burst
region, seismic reflection travel time is delayed, seismic amplitude is weakened and seismic frequency is reduced. Therefore,
it can be concluded that seismic exploration technique is promising for use in distinguishing coal and gas over-burst regions
based on the variation of seismic reflection travel time, amplitude and frequency.
Supported by the Key Program of National Basic Research Program(973) of China (2006CB202208); the CBM Important Project of
2008ZX05040-003 in China |
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Keywords: | coal and gas over-burst region seismic data characteristic identification |
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