A method and system for directly picking up first arrivals in time-frequency domain for low signal-to-noise ratio seismic signals
A seismic signal and low signal-to-noise ratio technology, applied in the field of seismic exploration, can solve the problems of seismic data relying on human intervention, time-consuming, excessive threshold selection and human intervention, etc., to achieve less manual intervention, reduce manual intervention, and run faster fast effect
Active Publication Date: 2020-12-15
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
[0010] (1) The selection of seismic data corresponding to a scale with a high signal-to-noise ratio relies too much on human intervention;
[0011] (2) It is time-consuming to perform time-frequency forward and inverse transformation on the signal at the same time for each pick-up
[0018] (1) The noise suppression process of each signal needs to perform time-frequency forward and inverse conversion at the same time, which is time-consuming;
[0019] (2) The threshold selection in the denoising process relies too much on human intervention
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[0068] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0069] Such as figure 1 As shown, a method and system for directly picking up the first arrival in the time-frequency domain of the present invention for low signal-to-noise ratio seismic signals, the basic steps are as follows:
[0070] 1) Transform the original data into the time-frequency domain through time-frequency forward transformation;
[0071] 2) Carry out noise suppression using an adaptive noise attenuation method;
[0072] 3) First-arrival picking is carried out directly in the time-frequency domain using statistical methods;
[0073] The following is a detailed description of the above steps:
[0074] The transformation of the original data into the time-frequency domain described in step 01 can be realized through, but not limited to, time-frequency transformation such as wavelet transformation, as shown in formula (...
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The invention relates to a time-frequency domain direct first-arrival method and system for low signal-to-noise ratio seismic signals, belonging to the technical field of seismic exploration. The present invention first carries out time-frequency forward transformation on low signal-to-noise ratio signals; then performs adaptive noise attenuation in the time-frequency domain; First-arrival picking is performed using a statistically based approach in the time-frequency domain. The present invention has the self-adaptive characteristics of fast running speed and less manual intervention. Through the accurate first-arrival position of the acquired low signal-to-noise ratio data, the follow-up passive source source positioning, velocity analysis and tomographic imaging of target areas with poor acquisition quality will be improved. The accuracy of seismic processing results.
Description
technical field [0001] The invention relates to a method and system for directly picking up first arrivals, belonging to the technical field of seismic exploration, in particular to a time-frequency domain direct picking first arrival method and system for low signal-to-noise ratio seismic signals. Background technique [0002] Seismic signal first-arrival picking refers to the arrival-time picking of the first-arrival waveform of the seismic signal. It is one of the most basic data processing methods in the field of seismic exploration. The picking accuracy determines the seismic processing of passive source source positioning, velocity analysis, and tomographic imaging. the accuracy of the results. The traditional energy ratio method and the first-arrival picking method based on statistical information can obtain high picking accuracy when the signal-to-noise ratio is high, but when the signal-to-noise ratio decreases, the picking accuracy of the traditional method is also...
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IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/288G01V1/362
Inventor 刘强陆斌王云宏王保利覃思崔伟雄聂爱兰
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP