Abstract
In last several years there is an increasing interest in phenomenon of low frequency (1-10Hz) spectral anomalies above the hydrocarbon reservoirs. The practical application of this phenomenon is an opportunity for a direct hydrocarbon exploration. In this paper we report the preliminary results of the Low Frequency Passive Seismic survey, which have been performed in Russian Federation, Republic of Tatarstan (Volga-Urals oil province) in the eastern board of the Mellikesskaya hollows. The subsurface structure of the survey area is complicated by Visean ridges, Bobrikovian sediments of terrigenous facies with excellent productivity properties. At such complicated structures the conventional seismic fails, so the Low Frequency Passive Seismic Technology has been chosen as an exploration tool. Using high-sensivity broadband seismometers we have performed a registration of seismic wave field at 64 points of the survey area. To estimate the production properties of an oil saturated area we have calibrated spectral properties of seismic signal at points, penetrated by wells. There is an excellent agreement of the survey results with five new wells, which has been drilled after the survey, so the Low Frequency Passive Seismic Technology also can be applied at complicated subsurface structures where conventional seismic fails.
