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Method and device for decomposing directional wave of elastic wave field, and computer storage medium

An elastic wave and wave field technology, applied in the field of seismic exploration, can solve problems such as unsatisfactory imaging quality and complex reasons, and achieve the effects of avoiding wavefront overlap, accurate angle gathers, and improving computational efficiency

Active Publication Date: 2017-11-10
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In the existing technology, the decomposition of up, down, left, and right direction waves can better suppress the low-frequency noise generated by the correlation of direction waves propagating in the same direction, and to a certain extent suppress the cross-correlation between the forward wave field of the shot point and the backward wave field of the receiver point. The Illusion I ud Noise, but for the three-dimensional situation, the cause of imaging noise is more complicated, only the decomposition of the up, down, left, and right direction waves cannot meet the requirements of the preset imaging quality

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  • Method and device for decomposing directional wave of elastic wave field, and computer storage medium
  • Method and device for decomposing directional wave of elastic wave field, and computer storage medium
  • Method and device for decomposing directional wave of elastic wave field, and computer storage medium

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Embodiment 1

[0161] refer to Figure 2(a) to Figure 2(l) Shown are the results of separating the quasi-p waves in the six directions of front, back, up, down, left, and right respectively under the heterotropic medium. It can be seen that the quasi-p waves are well separated in all directions and their amplitude and phase are well preserved. On this basis, the Poynting vectors of the wave fields in all directions are calculated; then, the Poynting vectors are used to output the reflection angles of the wave fields, and then the corresponding ADCIGs gathers are generated. This method avoids the influence of wave front overlap and wave mode coupling on the calculation of wave propagation direction, and the generated ADCIGs gathers are more accurate, which can improve the imaging quality of imaging using ADCIGs gathers.

[0162] refer to Figure 4 As shown, the present application also discloses a directional wave decomposition device for an elastic wave field, including a first processing ...

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Abstract

The invention discloses a method and a device for decomposing the directional wave of an elastic wave field, and a computer storage medium. The method includes the following steps: expanding the time complex domain of an input wave field based on Hilbert transform to get a time complex domain expanded wave field; carrying out elastic wave numerical simulation on the time complex domain expanded wave field; based on an IDW interpolation algorithm of a preset variation function, decoupling and separating the longitudinal and transverse waves of the time complex domain expanded wave field after elastic wave numerical simulation to get a longitudinal-wave time complex domain wave field and a transverse-wave time complex domain wave field; and based on space complex domain expansion of Hilbert transform, decomposing the directional waves of the longitudinal-wave time complex domain wave field and the transverse-wave time complex domain wave field in front, rear, left, right, upper and lower directions to get multiple direction wave fields. The directional wave of a 3D elastic wave field can be decomposed, and the computational efficiency can be improved. The Poynting vector can be calculated using the directional waves obtained from decomposition, and then, a more accurate angle domain imaging gather can be obtained. The imaging quality is improved.

Description

technical field [0001] The present application relates to the field of seismic exploration, in particular to a method, device and computer storage medium for directional wave decomposition of an elastic wave field. Background technique [0002] Imaging noise in elastic wave reverse time migration includes coupling noise, low frequency noise and imaging artifact noise. Coupling noise mainly comes from the noise caused by the coupling of longitudinal waves and shear waves together for imaging. Low-frequency noise and imaging artifact noise mainly come from cross-correlation imaging of directional waves in specific directions, for example, I ldld ,I lulu ,I rdrd ,I ruru ...The combination of these same subscripts is the main source of imaging low-frequency noise; for example, I luld ,I lurd ,I ruld ,I rurd ...The upgoing wave of the shot point wave field and the downgoing wave of the wave field of the receiver point, when there is a strong velocity change, due to the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/34
CPCG01V1/302G01V1/345G01V2210/67G01V2210/74
Inventor 王之洋胡婷袁雨欣刘洪
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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