Geometric spreading compensation method based on uniform horizontal layered medium model

A technology of geometric diffusion and compensation method, applied in seismic signal processing and other directions, can solve problems such as limited accuracy and 2-D geometric diffusion compensation technology does not consider ray plane diffusion, and achieves the effect of improving accuracy and maintaining computational efficiency

Inactive Publication Date: 2015-07-15
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] The second is that the 2-D geometric diffusion compensation technology does not consider the diffusion outside the ray plane, so its accuracy is limited

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  • Geometric spreading compensation method based on uniform horizontal layered medium model
  • Geometric spreading compensation method based on uniform horizontal layered medium model
  • Geometric spreading compensation method based on uniform horizontal layered medium model

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, a kind of geometric diffusion compensation method based on uniform horizontal layered medium model provided by the present invention comprises the following steps:

[0028] 1) Read into the computer the root mean square velocity information, the two-way vertical travel time information and the distribution information of the shot point (shot point and receiver point) in the calculation area of ​​the seismic data to be compensated.

[0029] 2) According to the root mean square velocity information and the two-way vertical travel time information, the layer velocity obtained by inversion of the Dix (Dix) formula (1) is used to construct the overall framework of the uniform horizontal layered medium model:

[0030] V i 2 = ( ...

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Abstract

The invention relates to a geometric spreading compensation method based on a uniform horizontal layered medium model. The geometric spreading compensation method comprises the following steps: 1) reading root mean square speed information, two-way vertical traveltime information and shot and positioning point distribution information in a computer; 2) obtaining the uniform horizontal layered medium model comprising information about layer speed and layer thickness of each layer according to the root mean square speed information and the two-way vertical traveltime information; 3) performing ray tracing on the uniform horizontal layered medium model from a shot point to obtain ray position and traveltime information; 4) determining relative geometric spreading compensation values of reflecting layers according to a geometric spreading compensation formula; 5) obtaining a compensation value at detection points through linear interpolation, interpolating the relative geometric spreading compensation values to sampling points of corresponding seismic data volumes according to a seismic data format, and outputting data to be used for following data processing. The geometric spreading compensation method has the advantages that the accuracy of a geometric spreading compensation technology is improved, and can be widely applied to the geometric spreading compensation technology in the seismic data processing process.

Description

technical field [0001] The invention relates to a geometric diffusion compensation method, in particular to a 2.5-dimensional geometric diffusion compensation method based on a uniform horizontal layered medium model in seismic data processing. Background technique [0002] Geometric diffusion compensation technology is a non-negligible link in seismic data processing, and it is the basis for further data processing technologies such as AVO (Amplitude Versus Offset, amplitude variation with offset) attribute analysis, full waveform inversion, and migration. Whether the geometric diffusion compensation technology is applied accurately or not directly affects the effect of other data processing and interpretation technologies in application. Therefore, it is necessary to study the accuracy of geometric diffusion compensation specifically, and the core problem of studying its accuracy is to calculate geometric diffusion more accurately. In terms of numerical calculation, the c...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 刘春成陈宝书汪小将仝中飞杨小椿叶云飞刘明忱
Owner CHINA NAT OFFSHORE OIL CORP
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