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Elastic wave least squares inverse time migration method based on acoustic-elastic coupling equation

A coupling equation and least squares technology, applied in the field of elastic wave least squares reverse time migration based on the acoustic-elastic coupling equation, can solve problems such as crosstalk artifacts and low spatial resolution

Active Publication Date: 2020-01-14
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0005] Aiming at the problems of low spatial resolution and serious crosstalk artifacts in the existing ERTM method for four-component seismic data on the seabed, this application provides a least-squares inverse-time offset method

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  • Elastic wave least squares inverse time migration method based on acoustic-elastic coupling equation
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  • Elastic wave least squares inverse time migration method based on acoustic-elastic coupling equation

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Embodiment Construction

[0100] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0101] figure 1 , showing the flow chart of the method proposed by the present invention, the Marmousi2 model is taken as an example below to introduce the process of the present invention:

[0102] (1) Input the migration model of P-wave and S-wave velocity and density. In this example, the real reflectance model is shown in Figure 2, the model grid is set to 601x201, and the spatial sampling interval is 6.25m. In this experiment, 61 shots were evenly deployed on the seabed, with 601 shots per shot. The Ricker wavelet with a main frequency of 20 Hz was used to excite the longitudinal wave source. The time recording time was 1.6 s, and the sampling interval was 0.4 ms. The observed 4C data are shown in Figure 3;

[0103] (2) According to the two-dimensional acoustic-elastic coupling equation, the forward wave field of the gun end is calculate...

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Abstract

The invention provides an elastic wave least squares inverse time migration method based on an acoustic-elastic coupling equation. The method comprises the steps of: firstly, inputting an initial longitudinal and horizontal wave velocity and a density initial model, synthesizing a shot end forward propagation wave field and a detection end reverse propagation wave field by using an acoustic-elastic coupling propagation equation and an accompanying equation thereof, and figuring out a multi-parameter image according to the imaging conditions of the longitudinal and horizontal wave velocity anddensity; then, synthesizing reflected wave data by back migration according to a first-order Bonn scattering equation of the acoustic-elastic coupling equation; and evaluating the imaging result according to a four-component waveform residual objective function, if the imaging result is not satisfied, iteratively updating the longitudinal and horizontal wave velocity and density imaging results byusing a CGLS algorithm of a diagonal Hessian precondition, until the condition is satisfied, and returning a final result.

Description

technical field [0001] The invention relates to an imaging method for seabed four-component seismic data, in particular to an elastic wave least squares reverse time migration method based on an acoustic-elastic coupling equation, which belongs to the technical field of seismic wave imaging. Background technique [0002] Seabed seismic exploration has gradually become an important geophysical means for offshore oil and gas exploration, development and monitoring. Compared with conventional surface streamer observations, submarine seismic exploration has many advantages, such as high signal-to-noise ratio, precise geophone positioning, repeatable observation requirements, easy to carry out wide-angle observations, and less affected by sea conditions. So far, the acquisition and pre-processing technologies of seafloor four-component (4C) seismic data, such as denoising, relocation, redirection, and merger of water and land inspection, etc., have been relatively mature, but the...

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Application Information

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IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/306G01V1/36G01V2210/32G01V2210/51G01V2210/6226
Inventor 孙敏傲金双根
Owner NANJING UNIV OF INFORMATION SCI & TECH
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