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
CN103576197AActive Publication Date: 2014-02-12BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2014-02-12

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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.
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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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