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A Method of Spatial Correlation Elastic Wave Reflection Waveform Inversion Based on Acoustic Operator

A waveform inversion and cross-correlation technology, which is used in measurement devices, instruments, scientific instruments, etc., to reduce computation and memory requirements, improve inversion accuracy, and achieve the effect of decoupling

Active Publication Date: 2020-05-19
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0005] Aiming at the problem of cycle skipping in the existing ERWI method and the dependence on true amplitude migration technology, the present invention introduces a spatial correlation function to make full use of the kinematic information of seismic reflection data, alleviate the problem of cycle skipping and true amplitude migration overdependence of the background model for obtaining P- and S-wave velocities

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  • A Method of Spatial Correlation Elastic Wave Reflection Waveform Inversion Based on Acoustic Operator
  • A Method of Spatial Correlation Elastic Wave Reflection Waveform Inversion Based on Acoustic Operator
  • A Method of Spatial Correlation Elastic Wave Reflection Waveform Inversion Based on Acoustic Operator

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Embodiment

[0075] The present invention is based on the spatial cross-correlation elastic wave reflection waveform inversion method of the acoustic wave operator. The Sigbee2A model experiment is taken as an example below, and its real model is shown in Figure 2. The method specifically includes the following steps:

[0076] (1) The initial model α of the read longitudinal and shear wave velocities 0 and beta 0 , as shown in Fig. 3, and multi-component seismic observations, including reflected PP waves and PS waves d p,obs , d s,obs ,As shown in Figure 4;

[0077] (2) According to the current model α of the acoustic wave operator and the longitudinal and shear wave velocities k and beta k , to calculate the P-wave field u p,b ; According to the observed reflected PP wave data d p,obs , calculate the backpropagation P wave field w at the detection end p,b . All the forward and reverse propagating wave fields involved in this application are functions of time t;

[0078] (3) Accor...

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Abstract

The invention provides a spatial cross-correlation elastic wave reflection waveform inversion method based on an acoustic wave operator. Effective utilization of the kinematics information of the multi-wave multi-component reflection seismic data is realized by adopting a spatial correlation function, the height dependence on the complete seismic waveform in a data matching process is reduced, andthe nonlinear problem of inversion is relieved, so that a background model of longitudinal and transverse wave velocity is accurately and efficiently inverted. In the implementation process, the wavepaths of the reflection PP and PS are constructed by utilizing the acoustic wave operator to carry out fractional inversion of the longitudinal and transverse wave velocities; and the distribution inversion strategy can effectively press the coupling effect between the longitudinal and transverse wave velocities, the inversion precision of the two parameters is improved, and meanwhile, the demandof the calculation amount and the memory are remarkably reduced. The obtained longitudinal and transverse wave velocity inversion result can provide an accurate background model for high-resolution and high-precision seismic imaging, and therefore has important significance in solving the processing requirements of actual multi-component seismic data.

Description

technical field [0001] The invention relates to an elastic wave multi-parameter background modeling method, which belongs to the technical field of seismic wave imaging. Background technique [0002] Elastic Wave Full Waveform Inversion (EFWI) can use the observed multi-component seismic data to obtain subsurface elastic parameter models, such as longitudinal and shear wave velocities, density, elastic impedance, anisotropy parameters, etc. important means of exploration and development. However, due to the limited aperture of the actual observation, EFWI can usually only obtain the effective update of the shallow velocity model from the observed first arrival wave, while the information about the middle and deep layer model is reflected in the reflected wave, which is difficult to use. For this reason, some scholars have proposed the elastic wave reflection waveform inversion method (ERWI). This method can realize mid-to-deep update of multiple parameter models by extract...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V1/306G01V2210/6222G01V2210/6242
Inventor 孙敏傲金双根
Owner NANJING UNIV OF INFORMATION SCI & TECH
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