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Reverse time migration method of stable qP wave in TTI (tilted transversely isotropic) media

A technology of reverse time migration and medium, applied in the field of seismic exploration data processing, can solve problems such as large amount of calculation and inability to guarantee absolute stability

Inactive Publication Date: 2014-12-17
SHANGHAI QINGFENG ZHIYUAN GEOPHYSICAL GEOLOGICAL EXPLORATION TECH
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Problems solved by technology

The solution of the finite shear wave equation is more stable, but it also has its own problems, such as the residual shear wave energy is stronger than the acoustic approximation equation, and the calculation amount of the solution is also large
In addition, the finite shear wave equation can enhance the stability of the solution, but it cannot guarantee absolute stability

Method used

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  • Reverse time migration method of stable qP wave in TTI (tilted transversely isotropic) media
  • Reverse time migration method of stable qP wave in TTI (tilted transversely isotropic) media
  • Reverse time migration method of stable qP wave in TTI (tilted transversely isotropic) media

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Embodiment Construction

[0062] This embodiment takes the following technical solutions: A, qP wave equation in the TTI medium with regularization term;

[0063] (a) The qP wave equation is derived from the elastic wave equation

[0064] The elastic wave equation after acoustic approximation in TTI medium is:

[0065] ρ ∂ v x ∂ t = d 1 ( σ 11 ) + d 3 ( σ 33 - σ 11 )

[0066]

[0067]

[0068]

[0069] (1)

[0070] The differential operator is defined as:

[0071]

[0072]

[0073]

[0074] For the acoustically approximated equation (1) in the TTI medium, for the sake of calc...

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Abstract

The invention relates to the technical field of processing of seismic exploration data and relates to a reverse time migration method of stable qP wave in TTI (tilted transversely isotropic) media. The method includes the steps: a qP wave equation with regularization items is deducted on the basis of an existing stable qP wave equation in TTI media; adaptive regularization parameters are selected: Sigma=max{sqrt( <2>8( )),sqrt( <2>Phi( )), with 8 referring to a tilt angle of a formation and Phi referring to an azimuth angle of the formation. On the basis of the existing stable qP propagator, regularization items are added to the qP wave equation, a more stable qP wave equation is obtained without excess calculation and storage, TTI media RTM (reverse time migration) is more widely applicable to the model, and the algorithm is more practical; through tilt angle and azimuth angle information of the formation, magnitudes of regularization coefficients are automatically determined without excess manual intervention, and a regularization equation is more steady in processing actual data.

Description

Technical field: [0001] The invention relates to the technical field of seismic exploration data processing, in particular to a qP wave reverse time migration method with stable TTI medium. Background technique: [0002] The stable propagation of qP waves in TTI media is the key to the practical application of TTI RTM, and it is also a research hotspot. At present, there are two main ideas in the research of stable qP wave propagation operators in TTI media: (1) Starting from the elastic wave equation. Starting directly from the elastic wave equation of anisotropic media, the pseudoacoustic wave equation corresponding to the elastic wave equation is obtained by acoustic approximation. The obtained equation retains most of the characteristics of the original elastic wave equation system. For example, when certain boundary conditions are met, Maintain the conservation of the sum of elastic potential energy and kinetic energy, which will enhance the stability of the equation s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 周阳
Owner SHANGHAI QINGFENG ZHIYUAN GEOPHYSICAL GEOLOGICAL EXPLORATION TECH
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