Method for extracting converted wave angle channel set

A technology of converted wave and angle gathers, applied in the field of petroleum geophysical exploration, can solve the problems of large amount of calculation, slow calculation speed, large error, etc., and achieve the effect of easy implementation, improved speed and accuracy

Active Publication Date: 2014-02-12
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

[0004] The calculation speed of the straight ray method is fast, but the calculation angle is always small and the error is large; the calculation result of the ray tracing method is accurate, but its calculation load is large and the calculation speed is slow

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  • Method for extracting converted wave angle channel set
  • Method for extracting converted wave angle channel set
  • Method for extracting converted wave angle channel set

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Embodiment Construction

[0023] The invention converts the converted wave offset, travel time and velocity into corresponding longitudinal wave offset, travel time and velocity, and uses the longitudinal wave ray parameter method to obtain the incident angle of the converted wave. Such as figure 1 As shown, the incident angle θ of the converted wave with the offset x is equal to the incident angle θ of the longitudinal wave with the offset x', and the incident angle θ of the longitudinal wave with the offset x' is obtained by calculation, that is, the offset is obtained as Converted wave incident angle θ of x.

[0024] The specific implementation steps of the present invention are as follows:

[0025] 1) In the field, the longitudinal wave source is used to excite the seismic wave and the three-component geophone is used to record the seismic wave. According to the multi-wave and multi-component seismic data processing flow, the acquired longitudinal wave incident and shear wave reflection (PS) conve...

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Abstract

The invention discloses a method for extracting a converted wave angle channel set for improving the speed and precision of calculating the converted wave incidence angle in the earthquake process. A channel set, the converted wave speed and aeolotropy parameters of a converted wave are utilized for calculating the speed, the aeolotropy parameters of a longitudinal wave, the longitudinal shot-geophone distance corresponding to the converted wave shot-geophone distance, the converted wave travel time of the aero shot-geophone distance, the longitudinal wave travel time and the interlayer longitudinal wave speed, wherein the channel set is formed through longitudinal wave incidence converted wave data and transverse wave reflection converted wave data, the amplitude of the channel set changes along with the offset distance, and the normal difference of the channel set is corrected. The converted wave incidence angle theta is calculated according to the longitudinal wave time difference equation and the interlayer longitudinal wave speed, and the incidence angle of each sampling point is calculated, wherein each sampling point is placed on the angle channel of the incidence angle. The process is carried out repeatedly for all sampling points to obtain the converted wave angle channel set. According to the method, the calculation is easy to conduct, and the speed and precision of extracting the converted wave angle channel set can be improved.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a method for extracting converted wave angle gathers used in converted wave AVA analysis, converted wave amplitude analysis and seismic attribute inversion. Background technique [0002] In multi-wave and multi-component seismic exploration, effective use of converted wave information can obtain more reliable rock elastic parameters. Useful lithological information can be extracted from converted wave AVA analysis, which can be used to predict medium information such as formation lithology and fractures. In the converted wave AVA equation, the independent variable is the converted wave incident angle. A basic step in converted wave AVA analysis is to convert the offset domain gather to the angle domain gather, that is, to calculate the incident angle of converted wave. At present, there are two methods to calculate the incident angle of the converted wave: one i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 张铁强钱忠平孙鹏远马光凯
Owner BC P INC CHINA NAT PETROLEUM CORP
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