An Application of Induced Seismicity Data Analysis for Detection of Spatial Structures and Temporal Regimes of Deformation Processes in Hydrocarbon Fields

An application of induced seismicity data to detection of deformation processes is considered. Methodology of the data interpretation is based on the conception of rock mass as a block medium adopting energy from internal and external sources and forming dissipative structures. The ideas from the stability theory of nonlinear systems are used. A spatial and temporal distribution of seismicity is analyzed to discover a regular, predictable component of seismic regime. Various methods were used for the analysis of seismic events listed in the seismic catalog in the region of Romashkino oil-field (Russia). Quasi-harmonious oscillations of seismic activity were found. They were synchronized in time with change of injection effectiveness. Spatial structures of seismicity were detected, and it was shown that these structures are in good agreement with tectonic faults. Data analysis shows correlation between seismic activity and imbalance of injected and extracted fluids. The obtained results show that water-injection effectiveness decreases during periods of increased seismic activity and increases during periods of low seismic activity.