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Elastic medium undulating surface Fresnel beam migration imaging method

A technology of undulating surface and elastic medium, applied in the field of exploration geophysics, it can solve the problems of low accuracy of Green's function and poor imaging quality, and achieve the effect of improving calculation accuracy, reducing crosstalk noise of longitudinal and shear waves, and being efficient and flexible.

Active Publication Date: 2021-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Since Gaussian beam migration requires plane wave decomposition on the observation surface, the sharply changing elevation makes the accuracy of the Green's function calculated by the conventional Gaussian beam method near the surface low, making the final migration result poor in near-surface and deep imaging quality

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  • Elastic medium undulating surface Fresnel beam migration imaging method
  • Elastic medium undulating surface Fresnel beam migration imaging method
  • Elastic medium undulating surface Fresnel beam migration imaging method

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Embodiment Construction

[0047] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0048] A Fresnel beam migration imaging method for an elastic medium undulating surface, comprising the following steps:

[0049] (1) Obtain the input data, the input data includes the longitudinal wave velocity model v p (x), shear wave velocity model v s (x), source function wavelet f(t), field observation data d obs (x r ,t), where x is the underground imaging space coordinates, and x r is the position of the receiver point, t is the recording time parameter, and the subscripts p and s of the velocity model represent the longitudinal wave and the shear wave.

[0050] (2) Using kinematic ray tracing to calculate the source position x s to underground imaging points x The longitudinal wave traveltime τ for , the propagation parameters are calculated using kinetic ray tracing The kinematic ray tracing equation is sh...

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Abstract

The invention discloses an elastic medium undulating surface Fresnel beam migration imaging method, and relates to the field of exploration geophysics. According to the method, the seismic wave beam has the effective half-width of 1 / 4 wavelength near the near surface, and the calculation precision of the Green function of the near-surface region can be remarkably improved. The novel seismic wave beam is applied to continuation of a multi-wave multi-component seismic wave field, an elastic medium Fresnel beam migration imaging method is developed, and the near-surface imaging quality of land data can be remarkably improved while accurate imaging of a middle-deep part is guaranteed.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to a Fresnel beam migration imaging method for elastic medium undulating surface. Background technique [0002] Seismic migration is an important step in seismic data processing that converts prestack seismic data into subsurface reflectivity profiles. Gaussian beam migration is an imaging method with computational efficiency and imaging accuracy between ray-like migration and wave equation migration. It not only retains the high efficiency and flexibility of ray-like imaging methods, but also has the same Comparable imaging accuracy. At present, Gaussian beam migration has been extended to elastic media, and the information of longitudinal wave and shear wave can be used at the same time, which can not only accurately describe the information of underground structure, but also give a certain estimation of lithology information. [0003] At present, typical onshore oil and ga...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/512
Inventor 杨继东田祎伟黄建平李振春孙加星徐洁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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