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Decoupling elastic wave reverse time migration method, system and application

A reverse time migration, elastic wave technology, applied in the field of exploration seismology data processing, can solve the problems of crosstalk artifacts, low frequency noise longitudinal and shear waves, etc., to improve imaging resolution and signal-to-noise ratio, avoid crosstalk noise, and avoid background noise Effect

Active Publication Date: 2021-06-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Application Information

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Problems solved by technology

[0012] Aiming at the problems existing in the prior art, the present invention provides a theoretical method, processing algorithm and technical flow of decoupled elastic wave reverse time migration, especially a solution based on vector Helmholtz decomposition and impedance-sensitive nuclear imaging conditions Coupled elastic wave reverse time migration theory method, efficient algorithm and processing flow, aiming to solve the problem of low frequency noise and longitudinal and transverse wave crosstalk artifacts in elastic wave reverse time migration

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  • Decoupling elastic wave reverse time migration method, system and application
  • Decoupling elastic wave reverse time migration method, system and application
  • Decoupling elastic wave reverse time migration method, system and application

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Embodiment 1

[0084] In order to solve the problems of low-frequency noise and longitudinal and transverse wave crosstalk artifacts in elastic wave reverse time migration, the present invention proposes a decoupled elastic reverse time migration imaging method based on vector Helmholtz decomposition and impedance-sensitive nuclear imaging conditions. The invention first uses vector Helmholtz decomposition to separate wave fields to obtain amplitude-preserved pure longitudinal (P) wave and pure transverse (S) wave vector wave fields, and then uses elastic wave impedance sensitive kernel function to calculate imaging conditions to obtain high Precision PP and PS imaging results.

[0085] The decoupling elastic reverse time migration imaging method based on the impedance sensitive core of the present invention includes:

[0086] (1) Acquire input data, the input data includes: longitudinal wave migration velocity model v p (x), shear wave migration velocity model v s (x), density model ρ(x),...

Embodiment 2

[0107] The description given below is a description of the actual effect of the embodiment in the model.

[0108] By applying the method provided by the invention to the imaging of the international standard Marmousi model, ideal PP and PS imaging results are obtained. P-wave velocity model (such as Figure 4 shown), the shear wave velocity model (such as Figure 5 shown); with an observation aperture of 3 km and a real velocity model for full waveform forward modeling, the observed seismic records are obtained, with a total of 103 shot data; input source wavelet and migration model for source wave field continuation, and Obtain the continuation wave field of the receiver point by backpropagating the seismic records, and apply the sensitive kernel function imaging conditions to obtain the imaging results (such as Figure 10 and Figure 11 shown). In order to compare the imaging effects, the imaging results obtained by using the conventional elastic wave reverse time migrat...

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Abstract

The invention belongs to the technical field of exploration seismic data processing, and discloses a decoupling elastic wave reverse time migration method and system and application, and the method comprises the steps: obtaining an input seismic record, a seismic wavelet, a density model and a speed model; obtaining a seismic source and a detection point continuation wave field by solving an elastic medium wave equation; carrying out elastic wave field separation by using vector Helmholtz decomposition to obtain separated amplitude-preserved pure longitudinal wave and transverse wave vector wave fields; using an elastic wave impedance sensitive kernel function for calculating imaging conditions, and obtaining high-signal-to-noise-ratio and high-precision longitudinal wave-longitudinal wave (PP) and longitudinal wave-transverse wave (PS) imaging results; and overlapping all shot integration imaging results to obtain a final migration imaging profile. According to the method, a pure longitudinal wave and pure transverse wave vector wave field separation result with true amplitude can be obtained, the imaging amplitude fidelity is improved, low-frequency noise generated by two-way wave field cross-correlation can be automatically avoided, the imaging signal-to-noise ratio and resolution are improved, and high-precision longitudinal and transverse wave combined seismic interpretation is assisted.

Description

technical field [0001] The invention belongs to the technical field of exploration seismology data processing, and in particular relates to a decoupling elastic wave reverse time migration method, system and application. Background technique [0002] At present, elastic wave reverse time migration is a migration method with the highest imaging accuracy in multi-wave and multi-component seismic data processing. However, due to the use of two-way wave information for wave field continuation, strong low-frequency noise and migration artifacts are often generated in complex areas such as salt domes, fault blocks, and thrust faults, which reduces the spatial resolution and imaging of migration results. The signal-to-noise ratio seriously affects the accuracy of subsequent seismic interpretation. In addition, traditional elastic wave imaging methods usually do not use the separation of longitudinal and transverse wave fields, but directly use the extended transverse and vertical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/66G01V2210/51
Inventor 杨继东黄建平李振春孙加星田祎伟徐洁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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