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Gaussian beam migration imaging method and device under undulating surface conditions

A technology of migration imaging and undulating surface, which is applied in the field of seismic exploration data processing and can solve problems such as imaging errors

Active Publication Date: 2018-04-03
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing Gaussian beam migration imaging method under the undulating surface condition, the Gaussian beam base function with zero curvature is used to decompose the seismic data, and then the Gaussian beam is propagated downward for imaging, which requires the undulating surface to be a plane locally, while The actual situation does not always meet this condition, so there will be imaging errors

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  • Gaussian beam migration imaging method and device under undulating surface conditions
  • Gaussian beam migration imaging method and device under undulating surface conditions
  • Gaussian beam migration imaging method and device under undulating surface conditions

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no. 1 example

[0030] The first embodiment of the present invention provides a Gaussian beam migration imaging method under undulating surface conditions, by using a smooth datum to correct seismic data, and then using a Gaussian beam basis function with a preset curvature parameter whose curvature is not zero to decompose the seismic data The waveform function is obtained from the data, and then the parameters of the waveform function are adjusted to a smooth reference plane, and then the migration imaging is performed, thereby avoiding the imaging error in the case of the undulating surface and improving the authenticity of the migration imaging results.

[0031] See figure 2 , the Gaussian beam migration imaging method and device include:

[0032] Step S100: Express the seismic wavefield at the surface in the form of superposition of Gaussian beams with preset curvature parameters in the time-space domain, and the seismic wavefield at the surface includes waveform functions and Gaussian ...

no. 2 example

[0147] The second embodiment of the present invention provides a Gaussian beam migration imaging method and device 200 under undulating surface conditions, please refer to Figure 7 , the device includes: a seismic wave field setting module 210, a parameter setting module 220, a model building module 230, a model solving module 240, a parameter conversion module 250 and an offset imaging module 260, wherein: the seismic wave field setting module 210 It is used to represent the seismic wavefield at the surface in the form of Gaussian beam superposition with preset curvature parameters in the time-space domain, and the seismic wavefield at the surface includes a waveform function and a Gaussian beam basis function in the time-space domain; the parameters The setting module 220 is used to set the width of the Gaussian beam basis function in the seismic wavefield at the surface as a preset width, and set the spacing between the centers of adjacent Gaussian beams in the seismic wave...

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Abstract

The invention provides a Gaussian-beam migration imaging method and apparatus for areas with irregular topography and relates to the field of seismic exploration material processing. The method includes the following steps: representing a seismic wave field at the earth's surface in the form of Gaussian-beam superposition in the space-time domain with preset curvature parameters, the seismic wave field at the earth's surface including a waveform function and a space-time domain Gaussian-beam base function; obtaining a set seismic wave field at the earth's surface; on the basis of the set seismic wave field at the earth's surface, establishing an earth's surface seismic wave field decomposition model; on the basis of seismic data which is corrected to a smooth base level and a medium velocity model, optimizing and resolving the earth's surface seismic wave field decomposition model, obtaining a plurality of wave form functions corresponding to the seismic data; converting the parameter of the wave form functions to the smooth base level, obtaining real parameters of the wave form functions; on the basis of the medium velocity model and the real parameters of the wave form functions, propagating the Gaussian beams corresponding to the plurality of wave form functions, and performing migration imaging to obtain the result of migration imaging. The method and the apparatus can lower imaging errors.

Description

technical field [0001] The invention relates to the field of seismic exploration data processing, in particular to a Gaussian beam migration imaging method and device under undulating surface conditions. Background technique [0002] With the development of society and the improvement of people's living standards, the demand for oil and gas resources is increasing, but the amount of oil and gas resources that are easy to explore and exploit in my country is decreasing, and it is necessary to accelerate the exploration of oil and gas resources in complex structural areas. The piedmont structural belt has good trap conditions and is an important place for enrichment of oil and gas resources. However, the dual complex seismic geological conditions of "complex surface and complex underground" have caused great troubles to seismic exploration. [0003] Gaussian beam migration has the advantages of Kirchhoff migration, such as flexible method, steep angle imaging, etc., and can ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/282G01V1/362
Inventor 刘鹏王彦飞
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI