Offshore single-channel ultra-high-frequency acoustic-wave-data multi-wave identification and suppression method and system

Abstract

The invention discloses an offshore single-channel ultra-high-frequency acoustic-wave-data multi-wave identification and suppression method and system. The method comprises the following steps of step1, aiming at the single-channel data in offshore single-channel ultra-high-frequency acoustic wave data, calculating the autocorrelation function of the single-channel data; step2, according to the autocorrelation function, determining whether multiple waves exist; steps3. If the multiple waves exist, according to the autocorrelation function, determining a prediction deconvolution parameter, using the prediction deconvolution parameter to carry out prediction deconvolution calculation on single-channel data, and acquiring a prediction deconvolution result; stepS4, suppressing the multiple waves corresponding to the prediction deconvolution result and acquiring the suppressed single-channel data; and circularly executing the stepS1 to the stepS4 till that a condition that the multiple waves do not exist is determined. In the scheme, the multiple waves of various oscillating periods in the single-channel data can be automatically identified, the variational prediction deconvolution parameter can be acquired, and then, through using prediction deconvolution operation suppression, the multiple waves of the various oscillating periods are identified.

Description

technical field [0001] The invention relates to the technical field of seismic exploration data processing, in particular to a method and system for identifying and suppressing multiple waves of offshore single-channel ultra-high-frequency acoustic wave data. Background technique [0002] Offshore shallow stratum profile detection is a geophysical method based on the principle of hydroacoustics for continuous navigational detection of underwater shallow strata structure and structure. In this method, a transmitting system and a receiving system are towed on the ship to transmit and receive sound waves, which are then recorded by the Sub-bottom Profiler System to obtain the reflected waves of the stratum under the seabed, which are determined by the positioning system at the same time. observation point. The data is processed to obtain images of geological structures and structures beneath the seafloor. Since the frequency of the sound wave is as high as 1000Hz or more, it ...

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Problems solved by technology

However, the empirical method can only identify simple periodic multiples, but the multiples in a single channel data have multiple oscillation periods, and the oscillation period will also change greatly between different channels of data, which makes The applicability and suppression effect of the empirical method are greatly reduced, and thus the suppression of multiple waves cannot be performed well

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