Ocean bottom seismograph four-component ocean surface wave multi-order frequency dispersion energy imaging device and method

Abstract

The invention discloses an ocean bottom seismograph four-component ocean surface wave multi-order frequency dispersion energy imaging device and method, and belongs to the technical field of ocean seismic exploration. The method is implemented by the following steps: firstly, designing an ocean surface wave artificial earthquake observation system, designing a reasonable observation system according to the geological condition of an operation area to ensure the imaging resolution, and completing offshore artificial source earthquake operation; secondly, carrying out the data preprocessing of the seabed surface wave; carrying out schmidt wave and acoustic guided wave frequency dispersion energy imaging of the three-component seismometer and acoustic guided wave frequency dispersion energy imaging of the one-component hydrophone respectively; and finally, superposing and normalizing the three-component Schmidt wave frequency dispersion energy spectrum and the one-component acoustic guided wave frequency dispersion energy spectrum. The device is realized based on the method. Through the device and the method, frequency dispersion analysis of the ocean four-component ocean surface wavecan be realized, a multi-order ocean surface wave frequency dispersion curve is extracted, and a new technical support is provided for ocean geological engineering investigation and ocean geophysicalinvestigation in China.

Description

technical field [0001] The invention relates to the technical field of marine seismic exploration, in particular to a four-component ocean surface wave multi-order dispersion energy imaging device and method for a submarine seismograph. It is mainly used in marine geological engineering surveys and also in marine geophysical surveys. Background technique [0002] Because the shear wave velocity of shallow ocean sediments is directly related to the shear modulus, the shear modulus is often used as an indirect evaluation method, and is widely used in offshore oil platforms, offshore wind farms, submarine pipelines and submarine tunnels, etc. In engineering construction, it is used to measure whether there are "soft" media, cracks and water-containing caves in the seabed sediments. In my country's offshore waters, the shallow sedimentary layers are mostly soft sandstone, and the corresponding shear wave velocity value is as low as 80m / s. It is difficult to obtain converted wav...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a four-component ocean surface wave multi-order dispersion energy imaging method for a submarine seismograph, to solve the difficult problem of extracting multi-order dispersion curves in ocean surface wave detection, through four-component ocean surface wave data acquisition, four-component artificial Source gather data preprocessing, three-component Schulte wave dispersive energy imaging, one-component acoustic guided wave dispersive energy imaging and four-component dispersive energy spectrum superposition, to realize Schulte wave and acoustic guided wave four-component ocean surface wave Joint Dispersion Energy Imaging

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