Microseismic monitoring is a method for localizing fractures induced by hydraulic fracturing in search for shale gas. The aim of this paper is to conduct the data interpretation of the microseismic monitoring based on the results from Pom-erania region of Poland. The data has been collected from an array of geophones deployed on the surface. Ground vibrations have been recorded and analyzed for fracture location, magnitude and breakage mechanism. A velocity model of underlying formations has been used for successful microseismic monitoring. The model has been further tuned with signal from perfora-tion shots of known location. Imaging of events has been done using software MicSeis, which utilizes diffraction stacking of waveforms from multiple stations to image microseismic events with low signal-to-noise ratio. The imaging of microseismic events in MicSeis uses a grid search over all possible origin times and locations in the selected rock volume. The seismic moment tensors are automatically determined from the amplitudes from the grid search procedure and are used to model po-larities of events which then enhance constructive interference. Function characterizing a maximum stack per time sample have been calculated over whole volume and analyzed using the STA/LTA algorithm. Once the event has been detected in time, location has been determined through analysis of the 3D spatial image function. The procedure has been used to detect five events during hydraulic fracturing in Pomerania.
The microseismic monitoring is a method of monitoring of fracture propagation during hydraulic fracturing process.
The method uses array of geophones to localize micro tremors induced by liquid pumped underground at high rate and
pressure. The acquired information helps to optimize fracturing process and prevents fracture growth to aquifer levels. It was
proved to be useful on several unconventional hydrocarbon reservoirs in the USA. Conducted investigation was aimed at
evaluation of the possibility of using the technology on Polish unconventional reservoirs. In order to stand better chances of
success the analysis of several variants of monitoring was made. East Pomerania geological structure was compared to similar
structures in the USA. With this knowledge, financially feasible configuration was selected. The array of geophones was
dispatched around the drilling site and data acquisition was performed. The present paper is mainly focus on geological
structure, hardware selection, damping factor and noise level analysis. The usefulness of used receiver configuration is also
assessed.
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