Noise reduction method and noise reduction device for uplink wave in seabed node seismic data

Abstract

The invention provides a noise reduction method and a noise reduction device for an uplink wave in seabed node seismic data. The noise reduction method comprises the steps of determining a main frequency and a minimum frequency of a downlink wave after one-dimensional Fourier transform, and a frequency and a maximum amplitude of the downlink wave after two-dimensional Fourier transform; obtaininga deconvolution operator according to the main frequency, the minimum frequency, the frequency after the two-dimensional Fourier transform, the maximum amplitude and the downlink wave after the two-dimensional Fourier transform; performing deconvolution processing based on the deconvolution operator and the uplink wave subjected to two-dimensional Fourier transform to obtain seismic data; and performing two-dimensional inverse Fourier transform on the seismic data to obtain a denoised uplink wave. According to the invention, multiple waves of the shot point end existing in the uplink waves canbe suppressed, the signal-to-noise ratio of the seabed node seismic data is improved, the seismic prospecting data imaging precision is further improved, and a more accurate and reliable seismic prospecting process is achieved according to the seismic prospecting data imaging result with higher precision.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a noise reduction method and a noise reduction device for upgoing waves in seabed node seismic data. Background technique [0002] Ocean bottom node (OBN) seismic data acquisition is a marine seismic exploration technology that has emerged in recent years. Compared with conventional streamer acquisition, seabed node seismic data acquisition has the following advantages: the collected data is multi-component data, which will not be affected by surface drilling platforms and ships, and the positioning based on seabed node seismic data is also more accurate; The data has larger offset and wider azimuth angle, and the signal-to-noise ratio of seabed node seismic data is higher. Therefore, the seismic data acquisition of seabed nodes has been paid more and more attention by oil companies, and the requirements for processing technology of seabed node seismic data are also ...

AI Technical Summary

Problems solved by technology

[0003] In order to suppress the multiple waves at the shot point end in the upgoing wave, the method of predictive deconvolution is currently used, but the period of the multiple waves at the shot point end in the upgoing wave is not fixed, which results in the use of predictive deconvolution to suppress The effect of multiple waves at the shot point in the upgoing wave is not ideal

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