A method for extracting converted wave angle gathers

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

Active Publication Date: 2016-08-10
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

Method used

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  • A method for extracting converted wave angle gathers
  • A method for extracting converted wave angle gathers
  • A method for extracting converted wave angle gathers

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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. like 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) converte...

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Abstract

The invention is a converted wave angle gather extraction method for improving the speed and accuracy of calculating the converted wave incident angle in seismic processing. The converted wave data of the incident longitudinal wave and the reflected wave of the shear wave are used to form the normal time difference corrected gather and the converted wave whose amplitude changes with the offset distance. Wave velocity and its anisotropy parameters, calculation of P-wave velocity and P-wave anisotropy parameters, P-wave offset corresponding to converted wave offset and converted wave travel time of zero offset, P-wave travel time and interlayer P-wave velocity, Calculate the converted wave incident angle θ from the compressional wave transit time equation and the interlayer longitudinal wave velocity, calculate the incident angle of each sample point, place this sample point on the angle trace of the incident angle, repeat this process for all sample points, and obtain the converted wave angle gather. The invention is easy to calculate and can improve the speed and precision of extracting the converted wave angle gather.

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 Patents(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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