Apparatus and method for imaging a subsurface using frequency-domain elastic reverse-time migration
US-8953411-B2 · Feb 10, 2015 · US
Elastic reverse-time migration system and method using absolute value function for improving the quality of subsurface structure imaging
US9798026B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9798026-B2 |
| Application number | US-201615196841-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 29, 2016 |
| Priority date | Jul 2, 2015 |
| Publication date | Oct 24, 2017 |
| Grant date | Oct 24, 2017 |
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Abstract
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Provided is elastic reverse-time migration system and method using an absolute value function for improving the quality of subsurface structure images, and more particularly, elastic reverse-time migration system and method using an absolute value function for improving the quality of subsurface structure images capable of minimizing waveform changing by separating wavefields using stress-displacement relationships and improving accuracy of the subsurface structure images by applying the absolute value function to migration images.
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What is claimed is: 1. An elastic reverse-time migration system, comprising: a virtual source calculation unit being input seismic data and a subsurface structure model to calculate a virtual source; a virtual source wavefield calculation unit calculating a virtual source wavefield from the calculated virtual source; a back-propagated wavefield calculation unit loading the seismic data to perform back propagation processing and calculate a back-propagated wavefield; a virtual source wavefield waveform separation unit using stress-displacement relationships to decompose P-wavefield from the virtual source wavefield; a back-propagated wavefield waveform separation unit using the stress-displacement relationships to decompose P-wavefield from the back-propagated wavefield; and a convolution unit convoluting the two wavefields decomposed by the virtual source wavefield waveform separation unit and the back-propagated wavefield waveform separation unit, respectively, wherein the stress-displacement relationships satisfy the following Equation τ xx = ( λ + 2 μ ) ∂ u x ∂ x + λ ∂ u z ∂ z τ zz = ( λ + 2 μ ) ∂ u z ∂ z + λ ∂ u x ∂ x (in the above Equation, λ and μ represent the Lame's parameters, τ xx and τ zz represent stress tensors, u x and u z represent displacements, respectively, for the x- and z-axes). 2. The elastic reverse-time migration system of claim 1 , further comprising: an image quality improvement unit applying an absolute value function to migration images obtained by the convolution of the convolution unit. 3. An elastic reverse-time migration method, comprising: a) loading seismic data and subsurface structure model data; b) calculating a virtual source on the basis of the input data and calculating a virtual source wavefield; c) performing back propagation processing on the seismic data to calculate a back-propagated P-wavefield; d) decomposing a P-wavefield from the virtual source wavefield using stress-displacement relationships; e) decomposing a wavefield form the back-propagated wavefield using the stress-displacement relationships; and f) convoluting the two wavefields decomposed in the step c) and the step e), respectively, wherein the stress-displacement relationships satisfy the following Equation τ xx = ( λ + 2 μ ) ∂ u x ∂ x + λ ∂ u z ∂ z τ zz = ( λ + 2 μ ) ∂ u z ∂ z + λ ∂ u x ∂ x (in the above Equation, λ and μ represent the Lame's parameters, τ xx and τ zz represent stress tensors, u x and u z
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Classifications
Wave propagation modeling · CPC title
Virtual source · CPC title
- G01V1/282Primary
Application of seismic models, synthetic seismograms · CPC title
Reverse-time modeling or coalescence modelling, i.e. starting from receivers · CPC title
Migration · CPC title
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- What does patent US9798026B2 cover?
- Provided is elastic reverse-time migration system and method using an absolute value function for improving the quality of subsurface structure images, and more particularly, elastic reverse-time migration system and method using an absolute value function for improving the quality of subsurface structure images capable of minimizing waveform changing by separating wavefields using stress-displ…
- Who is the assignee on this patent?
- Korea Inst Geoscience & Mineral Resources
- What technology area does this patent fall under?
- Primary CPC classification G01V1/282. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 24 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).