Transverse wave velocity extraction method for seabed shallow deposition layer and processing terminal

A technology of shear wave velocity and extraction method, which is applied in seismic signal processing, geophysical measurement, measurement device, etc., to achieve the effect of less calculation, less components, and accurate shear wave velocity

Active Publication Date: 2020-06-12
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, one of the purposes of the present invention provides a method for extracting shear wave velocity for shallow sediment layers on the seabed, which ca

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  • Transverse wave velocity extraction method for seabed shallow deposition layer and processing terminal
  • Transverse wave velocity extraction method for seabed shallow deposition layer and processing terminal
  • Transverse wave velocity extraction method for seabed shallow deposition layer and processing terminal

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[0031] specific implementation plan

[0032] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0033] Such as Figure 1-Figure 4 As shown, a shear wave velocity extraction method for shallow seabed sediments includes the following steps:

[0034] Step 1: Generate a number of horizontal layered geological models of shallow seabed sediments. Usually, the number of horizontal layered geological models of shallow seabed sediments generated is ≥ 10,000. Each horizontal layered geological model includes at least formation thickness, longitudinal wave Velocity, shear wave velocity and density. The maximum stratum thickness of each model is set to a meter, and a is usually 1000 meters. This paper focuses on the shallow seabed sediments in the deep sea environment. Usually, the deep sea refers to the water depth below 500 meters. Therefore, a≥500 meters, of course The value of a can be adjusted according to actual ...

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Abstract

The invention relates to a transverse wave velocity extraction method for seabed shallow sedimentary layers and a processing terminal. The method comprises the following steps: step 1, generating a plurality of horizontal stratified geological models of the seabed shallow sedimentary layers; step 2, simulating each horizontal stratified geological model by adopting a seismic wave field numerical simulation method to obtain corresponding OBS data including a vertical component and a horizontal component; step 3, preprocessing the horizontal component of the OBS data, including performing time correction on the OBS data to obtain preprocessed OBS data; step 4, combining the OBS data and the transverse wave speed into label data, and inputting the label data into a neural network for training; and step 5, acquiring and preprocessing actual OBS data, inputting the actual OBS data to the neural network for processing, and multiplying an output result by a normalization factor to obtain a final transverse wave velocity. Manual intervention components are few, the calculation amount is small, and the transverse wave speed accuracy is higher.

Description

technical field [0001] The invention relates to the technical field of seabed seismic data processing, in particular to a shear wave velocity extraction method and a processing terminal for shallow seabed sediments. Background technique [0002] The shear wave velocity of shallow seabed sediments plays a very important role in ocean exploration, especially in the fields of ocean drilling and hydrate investigation in ocean engineering. At present, there are mainly the following methods for extracting shear wave velocity: (1) surface wave dispersion curve inversion; (2) sea bottom seismograph (OBS) data travel time inversion; (3) elastic wave full waveform inversion; (4) ) drilling survey. Among them, the method based on surface wave dispersion curve inversion requires the surface wave information to be recorded in the seismic data, but in the deep sea environment, it is generally difficult to collect surface wave information. When inverting shear wave velocity parameters ba...

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Application Information

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IPC IPC(8): G01V1/30G06F30/20G06N3/04
CPCG01V1/303G01V1/282G01V2210/6222G01V2210/661G06N3/045
Inventor 刘斌徐云霞薛花文鹏飞
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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