Method of extracting of shear wave velocity of dual-spaced full-wave train logging based on slowness-time

A technology of shear wave velocity and longitudinal wave velocity, which is applied in the direction of measuring devices, geophysical measurements, instruments, etc., can solve problems such as difficulty in extracting shear wave velocity, unobvious first arrival of shear wave, and greater influence of human factors, so as to achieve objective processing results and reduce The effect of human intervention

Inactive Publication Date: 2017-01-25
YELLOW RIVER ENG CONSULTING
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Problems solved by technology

This method essentially extracts the first arrival of the shear wave, but due to the influence of multiple factors such as signal interference, longitudinal wave and follow-up wave, the first arrival of the shear wave is not obvious, so this method is greatly affected by human factors
[0012] It is difficult to extract the shear wave velocity in the dual-source full-wave train acoustic logging data. The current dual-source full-wave train logging mostly only provides the compressional wave velocity of the formation, and there are few successful cases of extracting the shear wave velocity.

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  • Method of extracting of shear wave velocity of dual-spaced full-wave train logging based on slowness-time
  • Method of extracting of shear wave velocity of dual-spaced full-wave train logging based on slowness-time
  • Method of extracting of shear wave velocity of dual-spaced full-wave train logging based on slowness-time

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Embodiment Construction

[0026] The method for extracting shear wave velocity based on slowness-time full wave train logging in the present invention is based on the longitudinal wave velocity and combines with the development characteristics of shear waves to delineate the development range of shear waves on the slowness-time coherent spectrum , the shear wave velocity is significantly separated from the longitudinal wave velocity, reducing human intervention, and the result of shear wave velocity processing is more stable, including the following steps:

[0027] S1. Due to the high velocity of the longitudinal wave, the first wave of the whole wave train is the longitudinal wave, so the first wave of the logging data is read first, and the longitudinal wave velocity V of the logging data is obtained according to the time difference between the dual source distance and the two probes p , and calculate the slowness S of the longitudinal wave p = 1 / V p ;

[0028] S2, using the slowness-time correlat...

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Abstract

The invention discloses a method of extracting the shear wave velocity of dual-spaced full-wave train logging based on slowness- time, comprising S1, reading the first wave of the log data, and obtaining longitudinal wave velocity Vp based on the time difference between the dual-spaced two probes; S2, calculating the degree of correlation between different time waveforms; S3, determining the corresponding longitudinal wave energy mass development position based on the first wave extracted in step S1; S4, enclosing the transverse wave mass based on the longitudinal wave velocity and the development range of the transverse waves on the time shaft; S5, separately extracting and integrating the longitudinal and transverse energy mass on the slowness- time correction spectrum to get correlation coefficient curve of the separated longitudinal and transverse waves in the slowness domain; and S6, extracting the transverse wave peak to get the slowness of the transverse wave, and converting the slowness into velocity to get the transverse wave velocity of dual-spaced full-wave train logging. The invention had the advantages of reduced human intervention and accurate and stable transverse wave velocity results.

Description

technical field [0001] The invention relates to a method for extracting shear wave velocity of rock mass, in particular to a method for extracting shear wave velocity of double source spacing full wave train logging based on slowness-time. Background technique [0002] The shear wave velocity of the rock mass is an important parameter to obtain the Poisson's ratio, bulk modulus and shear modulus of the rock mass, and it is also an important characterization of the porosity and cracks of the rock mass. The rock mass sample obtained by borehole sampling is different from the undisturbed formation, and the velocity information of the rock mass fracture zone cannot be obtained directly. In engineering geological survey, full wave train logging with dual source spacing is often used to obtain the compressional wave and shear wave velocity information of in-situ rock mass. [0003] The dual-source full-wave train logging technology commonly used in engineering geological surveys,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303
Inventor 姜文龙张晓予张宪君周锡芳谢向文
Owner YELLOW RIVER ENG CONSULTING
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