Method for suppressing multiple waves based on L1 norm multichannel matched filtering

Abstract

The invention discloses a method for suppressing multiple waves based on L1 norm multichannel matched filtering. The method comprises the steps that a predicted multiple wave channel, a Hilbert transformation channel of the multiple waves, a high-frequency reconstruction channel and translation channels of above three kinds of data are used as multiple channels to be input, so that fitting is conducted with the multiple waves in an original seismic record, and a modulation frequency expanding technology is introduced to reconstruct high-frequency components of the predicted multiple waves. According to the method, a GPU acceleration technology is introduced into an algorithm, GPU / CPU collaborative and parallel computing is used for improving the computational efficiency, and a convergent self-adapting filter is acquired quickly. The method is applied to multiple wave suppressing of a theoretical model and actual data, a test result shows that compared with a conventional L2 form matched filtering method, a high-precision multiple wave suppressing result can be obtained, and meanwhile the energy of effective waves is well protected.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and relates to multiple wave suppression technology in the field of geophysical prospecting technology. Specifically, multiple waves are suppressed by using a multi-channel matched filter method based on the L1 norm, thereby realizing accurate suppression of multiple waves . Background technique [0002] The problem of multiple waves is one of the most prominent problems in ocean exploration. At present, seismic imaging is mainly based on the energy of primary reflection waves, and the existence of multiple waves will directly affect the authenticity and reliability of seismic data imaging, reduce the signal-to-noise ratio of data, and the interference of multiple waves will cause the reflection wave form of the target layer to occur. Distortion affects the correct understanding and follow-up processing of seismic data. If it is not effectively suppressed and eliminated, it will eventually...

AI Technical Summary

Problems solved by technology

In the prior art, although the prediction subtraction method based on the wave equation has been applied in the field of geophysical exploration technology, the method based on the wave equation needs to predict the multiple wave model first, but the wavelet that appears when the convolution operation predicts the multiple wave effect, so that the multiple waves in the multiple wave model do not match with the recorded multiple waves. Efficiently subtract multiples from the raw record

Moreover, no effective breakthrough has been made in the traditional multiple wave suppression processing technology

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