The description of the approach for the survey of fluid saturation levels and underground reservoirs developed by the authors (Schmidt Institute of Physics of the Earth RAS) and based on application of passive seismic methods is presented. The main idea of the developing approach is the following: the fluid saturation levels or the underground reservoirs filled uр with oil, gas or water, being the geological heterogeneities, have the effect of anomalies of microseismic wave field on the surface of the Earth. Thus, the approach is based оn allocation of anomalies in а spectrum of the dеер microseismic wave field around еxресtеd hydrocarbon deposits, underground reservoirs etc. Using natural seismicity of the Earth and so the absence of necessity to use artificial sources of seismic signals (vibrators, guns) is the essential advantage of this approach.
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