Are represented the results of the analysis of a microseisms spectrum, which is received at prospecting of small oil reservoirs on territory of Republic Tatarstan. For this analysis it is used the method based on revealing of peak abnormal high amplitude in a range of 1-10 Hz. Are discussed two alternatives hypothesis about nature of this peak over oil reservoirs. Based on experimental data it is shown, that the hypothesis of resonant amplification of microseisms in the resonator between daylight surface and oil reservoir is more adequate. It is shown, that it is can observe oil reservoirs, the border a sedimentary cover - the crystal and of other geological structures, such as active fault, as a peak on microseism spectrum.


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