Acoustic parameter acquisition method for seabed detection

Abstract

The invention relates to an acoustic parameter acquisition method for seabed detection. The method comprises the following steps: acquiring a plurality of single shot data of seismic source vibrationin a seabed detection area; intercepting a direct wave, a shallow reflection wave and a shallow refraction wave in the plurality of single shot data by using a time window to obtain observation data;acquiring an acoustic parameter initial model, and performing forward modeling on a seismic source waveform based on the acoustic parameter initial model to obtain forward modeling data; calculating awave field residual error according to the observation data and the forward modeling data, and constructing an error functional according to the wave field residual error; performing back propagationto the acoustic parameter initial model space by using the wave field residual error to obtain residual error back propagation data; calculating a speed gradient, a density gradient, a wave impedancegradient, an attenuation factor gradient and a Lame parameter gradient of an error functional by utilizing the forward modeling data and the residual back propagation data; and updating the acousticparameter initial model by utilizing each parameter gradient to obtain an accurate model corresponding to each acoustic parameter.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to an acoustic parameter acquisition method for seabed detection. Background technique [0002] Minerals and surrounding rocks have obvious differences in acoustic parameters. Different objects have different characteristics of acoustic parameters. The values ​​of acoustic parameters each have a certain range. The physical properties of each object can be judged according to the differences in acoustic parameters of different objects. [0003] At present, the method of tomographic inversion of first arrival travel time based on rays is more commonly used. This type of method is simple to calculate, does not require an accurate background field, and applies to complex surface conditions, so it has always been a common method for solving near-surface and shallow acoustic parameter modeling. However, this method is based on the shortest path principle of high-frequency...

AI Technical Summary

Problems solved by technology

[0005] When laying submarine pipelines and cables, it is necessary to detect the seabed. At present, there is a lack of a solution to obtain acoustic parameters for seabed detection.

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