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MATCHED FILTER APPROACH FOR MICROSEISMIC SIGNAL PROCESSING OF REAL DATA FROM EAST POMERANIA SHALE GAS
Abstract
The microseismic monitoring is a method of monitoring of fracture propagation during hydraulic fracturing (HF)process. An array of several hundred geophones is placed on the surface to record little ground tremors induced by fracturing process. Filtration and summation of signals from geophones is essential to identify and locate fracturing events from underground. Authors propose a method of matched filtering, that is usually used for detection of outliers in music records, to improve signal to noise ratio. A real data acquired from patch array of receivers in east pomerania during hydraulic fracturing operation is used for the research. The data is analysed on several levels of summation, starting from line signals through patch signals, ending with stack signal. The patterns are acquired from known events detected by our commercial partners - Seismic s.r.o. Strong events and perforation shots signals of known locations are analysed and compared with only-noise records giving the evaluation of detectability.
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