New algorithms of emission tomography for passive seismic monitoring of a producing hydrocarbon deposit: Part II. Results of real data processing

Abstract

The new suggested algorithms of seismic emission tomography and those used earlier made it possible to dispose of the effects caused by a strong industrial noise, to study the structure of the upper part of the Earth’s crust and to monitor the seismic processes that take place within the oil deposit being developed in West Siberia. An efficient use of the industrial background seismic illumination allowed three-dimensional imaging of the fault zone. From the recorded seismic noise at the time of arrival of the high-amplitude low-frequency seismic wave, a localized soliton-like object floating upwards on the rupture with the velocity of 10 m/s is identified. In the depth range from 1 to 6 km a vertical filament-like seismic source that is hypothesized to be associated with the vortex geological structure, namely, the zone of torsional strains, is revealed. The position of this source in a plane remains stable within 9 days, although the bursts in the amplitude of both industrial and natural seismic radiation affect the depth distribution of the radiation and result in the appearance of additional seismic sources.