A method for identifying resonance interference of microseismic monitoring signals and effectively suppressing it

Abstract

The invention provides a method for identifying and suppressing signal resonance interference during microseismic fracture monitoring. The method comprises the following steps: transferring microseismic fracture event signals into a frequency domain; respectively arranging three-component spectrum in terms of horizontal and vertical component; determining the resonance signal band frequency range; selecting a non-resonance interference spectrum channel on the vertical component spectrum arrangement; calculating the energy of a frequency sampling point and that of whole-channel signal master frequency, wherein the ratio of the two energies is a relative attenuation coefficient of the microseismic signal at the sampling point; calculating the master frequency energies of all resonance interference spectrum of each arrangement of the three-component spectrum, allowing the result to multiply the attenuation coefficient of the corresponding sampling point to obtain a spectrum compensation value for resonance interference band frequency compensation; transforming the frequency domain signals to a time domain through an inverted Fourier transform so as to complete suppressing of resonance signals. Due to the adoption of the method, the resonance interference in microseismic signals can be effectively identified and suppressed, so as to minimize the damage for effective signals. Therefore, the method is simple to use and high in calculation efficiency.

Description

technical field [0001] The invention relates to a fracturing microseismic monitoring data processing technology, in particular to a method for identifying resonance interference of a microseismic monitoring signal and effectively suppressing it. Background technique [0002] Fracturing microseismic monitoring refers to the monitoring of microseismic events caused by rock fractures during oilfield fracturing construction. Due to the special downhole acquisition method and the poor coupling between the downhole geophone and the borehole wall, the fracturing microseismic monitoring signals often have resonance interference in the acquired data, which has a great impact on the data processing. [0003] Due to the long duration of fracturing microseismic monitoring signals and the huge amount of data, it is impossible to process a small part of the signals separately. At present, the batch band-pass filtering method is mainly used for resonance interference in fracturing microsei...

AI Technical Summary

Problems solved by technology

In this way, resonance interference can be suppressed to a certain extent, but the frequency spectrum of the signal itself is changed, and the effective signal in this frequency band is also suppressed, which destroys the integrity of the signal to a certain extent; especially affects the take-off point of the arrival time of the microseismic event, which is very important for accurately picking up the microseismic event. The arrival time of the event is affected, which affects the processing effect of the microseismic monitoring data and causes a large error in the positioning result of the microseismic event

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