A method and device for suppressing harmonic interference of microseismic monitoring data

A technology for harmonic interference and microseismic monitoring, applied in seismic signal processing and other directions, can solve problems such as reducing the accuracy of microseismic positioning, and achieve the effect of strong pertinence, easy identification, and simple calculation.

Active Publication Date: 2017-10-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

At present, there is no highly targeted denoising method for microseismic records. Most of them follow the filtering method in seismic exploration. While filtering and suppressing noise, it also has an obvious suppression effect on microseismic signals, thereby reducing the accuracy of microseismic positioning.

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  • A method and device for suppressing harmonic interference of microseismic monitoring data
  • A method and device for suppressing harmonic interference of microseismic monitoring data
  • A method and device for suppressing harmonic interference of microseismic monitoring data

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] The working principle of this technical solution is: through FFT transformation in the frequency domain, a targeted filter is designed for the characteristics of harmonic interference, and the harmonic suppression is carried out channel by channel. Stability and effectiveness, the microseismic energy is relatively prominent after interference suppression, and the signal-to-noise ratio is improved.

[0055] Based on the above working principle, a method ...

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Abstract

The invention relates to a method and device for suppressing harmonic interference of microseismic monitoring data. The method includes: collecting microseismic data, sorting the seismic data recorded at each geophone point together as a common geophone gather; Perform FFT transformation on each track in the gather to obtain frequency-domain seismic data; use the frequency-domain seismic data to obtain the amplitude spectrum; perform multi-channel median filtering on each frequency sample of the amplitude spectrum to obtain the first median-filtered The amplitude spectrum of the amplitude spectrum; the multi-point median filtering is performed on each track of the amplitude spectrum after the first median filtering to obtain the amplitude spectrum after the second median filtering; the amplitude spectrum after the first median filtering is used and the amplitude spectrum after the second median filtering to obtain a filter factor; use the filter factor to filter the frequency-domain seismic data, and perform inverse FFT transformation on the filtered result to obtain the time domain after harmonic interference suppression Microseismic data.

Description

technical field [0001] The invention relates to the technical field of seismic exploration data processing, in particular to a method and device for suppressing harmonic interference of microseismic monitoring data. Background technique [0002] In unconventional oil and gas hydraulic fracturing projects or geothermal utilization projects, acoustic emission events generated during rock fractures can be obtained through microseismic monitoring, and the location of these events can reveal information such as the spatial distribution of underground rock fractures, which can be used for hydraulic fracturing, etc. It provides the most direct help for engineering parameter optimization and effect evaluation. [0003] At present, there are many microseismic monitoring methods, whether it is in-well monitoring or ground array monitoring, the data obtained generally have a low signal-to-noise ratio. Effective microseismic signals generally have weak energy and short duration, while v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 李彦鹏王熙明徐刚储仿东
Owner BC P INC CHINA NAT PETROLEUM CORP
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