Method for eliminating harmonic interference in controllable earthquake source earthquake exploration

Abstract

The present invention provides a method for eliminating harmonic interference in controllable earthquake source earthquake exploration. The method comprises the following steps of: firstly extracting a focal force signal, or acquiring the focal force signal through the weight of a heavy hammer and a plate and acceleration of them; then using the focal force signal to calculate a ratio of each subharmonic component and a fundamental signal amplitude spectrum, and calculating a predictive filtering operator; utilizing the predictive filtering operator to carry out filtering processing on a seismic channel record, and estimating a harmonic component of each channel; finally, subtracting the predicted harmonic component from an uncorrelated seismic channel record to achieve a purpose of eliminating the harmonic interference. According to the invention, a correlated channel record can be processed, processing can be carried out in a time domain, the processing also can be carried out in a frequency domain, near channel data can be processed selectively, a whole canon record also can be processed, the method is flexible and convenient, processing efficiency is high, and a requirement of present field collection can be satisfied.

Description

technical field [0001] The invention belongs to the field of digital processing of seismic data, belongs to the technology of improving the signal-to-noise ratio in the processing technology, and is a method for eliminating harmonic interference in seismic exploration of a vibrator. Background technique [0002] In order to improve production efficiency and reduce acquisition cost, the sliding scanning acquisition technology has been developed. In sliding scanning acquisition, since the latter shot can start to vibrate without waiting for the vibration of the previous shot to end, the data of the two shots before and after are partially superimposed together, and there will be adjacent interference during the correlation process, which seriously reduces the signal-to-noise ratio of the data . Therefore, suppression of harmonic interference in slide sweep acquisition is a key issue. At present, there are many harmonic suppression methods, all of which have achieved good res...

AI Technical Summary

Problems solved by technology

The research shows that in the conventional acquisition of vibrator, although the single shot record itself contains harmonic interference, relatively speaking, the interference has a weak influence on the effective signal, which is not enough to seriously affect the quality of the data

However, some algorithms are complex and unstable; some methods have higher requirements on data quality and are not widely applicable; some algorithms are too inefficient to meet the current real-time processing needs of thousands of gun records collected daily in the field

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