Sea-tunnel combined seismic detection method and system based on ocean noise

Abstract

The invention belongs to the technical field of ocean seismic detection, and particularly relates to a sea-tunnel combined seismic detection method and system based on ocean noise. The method comprises the steps of synchronously collecting a first seismic signal, a second seismic signal and a third seismic signal, wherein the signals are formed in the mode that ocean noise meets an unfavorable geologic body and then is transmitted to the tunnel wall, the sea surface and the sea; carrying out preliminary geological wave velocity inversion on the second seismic signal to obtain a geological wavevelocity initial model, carrying out beam forming processing on the abnormal wave velocity position according to the third seismic signal, and carrying out inversion correction on the geological wavevelocity initial model; and performing inversion and reverse time migration imaging on the first seismic signal based on the corrected geological wave velocity initial model to obtain a seismic section in front of the working surface of a tunnel boring machine.

Description

technical field [0001] The invention belongs to the technical field of marine seismic detection, in particular to a sea-tunnel joint seismic detection method and system based on marine noise. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Submarine tunnels are covered with seawater, and the cost of offshore exploration is high. It is difficult to ascertain the unfavorable geological conditions along the tunnel in the early stage of construction, especially under the construction conditions of tunnel boring machines, facing complex construction environments, and encountering unfavorable geological conditions such as fault fracture zones and weathered deep grooves Once it is not handled properly, it is easy to cause disasters such as water and mud inrush, landslides, etc., resulting in serious consequences. Compared with post-treatment, pr...

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Problems solved by technology

[0006] (1) Problems in the observation in the tunnel: the seismic detection data received by the receiving sensor in the tunnel rely on a relatively accurate initial geological wave velocity model in the imaging process, and it is difficult to realize the tunnel depth by only relying on the observation data in the tunnel. Accurate inversion of geological wave velocity in front of the face;

[0007] (2) Problems in ocean streamer observation: Ocean observation systems can provide an overview of seabed geological wave velocity, but different observation systems have their own emphasis. For example, the sea surface horizontal streamer seismic observation system is sensitive to horizontal layered geological structures, and the vertical cable Sensitive to steep geological structures, a single observation method cannot accurately measure the wave velocity information of various geological structures

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