A new method of spectral analysis of 'hydrocarbon tremors' (microseisms) is developed for seismic exploration of oil and gas. As an input data this method uses standard 3D seismic reflection data. In comparison with other methods of passive seismology, this method does not require any specific field acquisition and devices, since the input data can be extracted from conventional seismic reflection data. The know-how of the method is in using the time intervals in the wave records before the first arrivals, as input data for the method. Then, we have developed the method furthermore by using the intervals of seismic traces corresponded to the latest times, that is after all the reflection-waves' events. As an example, an algorithm is presented by its application to Oriental Siberia data. There is a strong correlation of the tremor spectrum intensity with the oil/gas pay-zone location. In the well perforated following our prognosis, substantial gas flow has been obtained with an excellent production rate.
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