Co-offset kirchhoff prestack depth migration imaging method based on irregular model aperture

A pre-stack depth migration and common migration technology, which is applied in the fields of common migration Kirchhoff prestack depth migration imaging and seismic migration imaging, which can solve the problem of loss of effective signals due to migration noise, and cannot take into account shallow and deep imaging. Issues such as quality, imaging efficiency, and offset noise suppression

Active Publication Date: 2020-10-23
JILIN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that a large amount of offset noise is introduced or a large amount of effective signals are lost in a wide or narrow rectangular aperture, and the shallow and deep imaging quality, imaging efficiency and offset noise suppression cannot be taken into account. Co-offset Kirchhoff Prestack Depth Migration Imaging Method

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  • Co-offset kirchhoff prestack depth migration imaging method based on irregular model aperture
  • Co-offset kirchhoff prestack depth migration imaging method based on irregular model aperture
  • Co-offset kirchhoff prestack depth migration imaging method based on irregular model aperture

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Embodiment

[0043] a. If Figure 6 As shown in a, the common offset seismic data, observation system, migration parameters, migration velocity model and other information are read in, which constitute the known conditions of the method of the present invention. In specific implementation, Figure 3a The basic shape of the imaging space migration velocity model is given, and the model size is 44.0km×7.7km; Figure 3b The common offset seismic data is given, here is a zero offset seismic data; the observation system mainly involves the trace spacing and the shot spacing are both 50.0m, and the number of shots is 896 shots; the offset parameters mainly involve the time sampling interval is 4.0ms, the number of sampling points is 2000, and the grid spacing of the model space is 5.0m.

[0044] b. According to the known conditions read in step a, such as figure 2 As shown: First, based on the conventional offset aperture selection method, according to the offset distance 2d, a rectangular o...

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Abstract

The invention relates to an irregular model aperture-based common offset Kirchhoff prestack depth migration imaging method. With too small width, the conventional rectangular aperture can suppress shallow offset noise but lowers depth imaging quality; with too large width, the conventional rectangular aperture can guarantee depth imaging quality but causes stronger offset noise and lowers shallowimaging quality. Considering both offset size and maximum depth of an imaging model space, the method designs an irregular model space offset aperture with narrow shallow and wide deep, splits the irregular aperture by using grids of unequal distances and calculates a travel timetable in the irregular model aperture alone, then performs common offset Kirchhoff prestack depth migration imaging. Themethod can suppress shallow offset noise effectively and guarantees depth imaging quality; a travel timetable outside an irregular aperture is not calculated, so that calculation efficiency is improved; the range of the depth offset aperture is maximized without increasing excessive calculation amount, so that advantages like higher depth even super-depth imaging quality are increased.

Description

technical field [0001] The invention belongs to the technical field of geophysical seismic data processing, in particular to a seismic migration imaging method, in particular to a common offset Kirchhoff pre-stack depth based on an irregular model aperture for the migration aperture problem in migration imaging Offset imaging method. Background technique [0002] Due to its advantages of high computational efficiency, stable imaging quality, low sensitivity to inaccurate velocity models, and easy implementation of migration velocity analysis, the Kirchhoff pre-stack depth migration imaging method with common offset is still the main method in the field of oil and gas exploration in the petroleum industry. and mainstream seismic imaging methods. The imaging quality of the conventional common-offset Kirchhoff prestack depth migration imaging method is controlled by many factors, among which the migration aperture is a crucial one. How to design a reasonable aperture range an...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/512
Inventor 孙章庆韩复兴刘明忱
Owner JILIN UNIV
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