Converted wave surface element mapping fast CCP gather extraction method

A wave surface element and fast technology, applied in the field of converted wave surface element mapping fast CCP gathers, can solve the problems of difficult calculation, complex analysis of converted wave velocity, unsatisfactory CCP gather method, etc., to achieve fast and accurate extraction Effect

Active Publication Date: 2017-12-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This method is more complicated to analyze the converted wave velocity, and needs to analyze the non-hyperbolic time-distance curve
And the calculation of the reflection point needs to solve a one-dimensional quartic equation or use an iterative solution method, which is very difficult to calculate
[0009] None of the above-mentioned CCP extraction methods are satisfactory

Method used

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  • Converted wave surface element mapping fast CCP gather extraction method
  • Converted wave surface element mapping fast CCP gather extraction method
  • Converted wave surface element mapping fast CCP gather extraction method

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Embodiment Construction

[0029] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0030] Here, the basic principle of the present invention is briefly introduced. figure 1 (a) is an exemplary bin mapping plan according to the present invention; figure 1 (b) is an exemplary bin mapping profile according to the present invention, S is the source point, and R is the receiving point. The inventor considers combining the imaging of the input channel and the output channel, adopts a parallel algorithm, and arranges different ranges of imaging bi...

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Abstract

The invention belongs to the field of physical geography, and particularly relates to a converted wave surface element mapping fast CCP gather extraction method. According to the method, the underground reflection points are mapped from the surface elements without approximate solving the position of the reflection points through the quartic equation, and the PS-waves of the extracted CCP gather meet the hyperbolic time distance curve characteristics so that the equivalent velocity spectrum of the converted waves can be directly picked up to directly update the velocity ratio of the three-dimensional space. With application of the converted wave surface element mapping fast CCP gather extraction method, fast and accurate extraction of the converted wave CCP gather at the time-space variable velocity ratio can be realized.

Description

technical field [0001] The invention relates to the field of geophysics, more specifically, to a fast CCP extraction method for mapping converted wave surface elements. Background technique [0002] Due to the asymmetry of the uplink and downlink propagation paths of the converted wave, the position of the conversion point is biased towards the receiving point, and changes with the depth, offset and velocity. The key to imaging based on co-converted points (CCP) is to obtain the coordinates of the converted points. [0003] When the subsurface medium is horizontally layered, a quartic analytical expression derived by Tessmer and Behle (1988) using an equivalent single uniform horizontal layer model approximates the coordinates of the transformation point well. A limitation of this method is the underlying assumption of a single uniform horizontal layer. [0004] Li Luming et al. (1997) proposed layered CCL iterative method to solve (Li Luming, Luo Xingxian. Principles of m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/32
CPCG01V1/28G01V1/32G01V2210/48G01V2210/74
Inventor 黄忠玉芦俊陈天胜王赟魏巍
Owner CHINA PETROLEUM & CHEM CORP
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