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Method for measuring attenuation coefficient of fast and slow shear waves under crack width of rock core

A technology of fracture width and measurement method, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, instruments, and analytical materials, etc. It can solve the problems of not being able to quantitatively evaluate fractures and not eliminating the influence of rock sample anisotropy.

Active Publication Date: 2017-04-19
YANGTZE UNIVERSITY
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Problems solved by technology

However, the fast and slow shear waves in these two methods are affected by the anisotropy of the rock sample, and the influence of the anisotropy of the rock sample has not been eliminated, so the fracture cannot be quantitatively evaluated.

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  • Method for measuring attenuation coefficient of fast and slow shear waves under crack width of rock core
  • Method for measuring attenuation coefficient of fast and slow shear waves under crack width of rock core
  • Method for measuring attenuation coefficient of fast and slow shear waves under crack width of rock core

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[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the invention.

[0027] The invention provides a method for measuring fast and slow shear wave attenuation coefficients under the width of rock core fractures, the process of which is as follows figure 1 As shown, the specific process is as follows:

[0028] Step 1: Make the core, clamp the core in the shear wave measurement holder, and place a shear wave transmitter and a shear wave receiver with the same polarization direction at both ends.

[0029] Specifically, the core processing is prepared in accordance with the national standard "Engineering Rock Mass Test Method Standard" (GB / T50266-2013), to...

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Abstract

The invention discloses a method for measuring attenuation coefficient of fast and slow shear waves under crack width of rock core. According to the method, by measuring amplitude of fast and slow shear waves before and after fracturing and introducing relative attenuation coefficient, corresponding relative attenuation coefficient of fast and slow shear waves before and after fracturing is calculated, and corresponding relative attenuation coefficient without cracks is subtracted from the relative attenuation coefficient after cracks so as to obtain the influence of cracks on attenuation of fast and slow shear waves. By the method, the influence of anisotropy of a rock sample on attenuation of fast and slow shear waves can be eliminated, and only by considering the influence of crack width on attenuation of fast and slow shear waves, quantitative evaluation of cracks can be realized.

Description

technical field [0001] The invention relates to the technical field of coupled pole shear wave logging, in particular to a method for measuring fast and slow shear wave attenuation coefficients under the width of rock core fractures. Background technique [0002] Acoustic properties of rocks are one of the key geophysical parameters for reservoir evaluation in oil and gas exploration and development, and are the basis for interpretation and application of acoustic logging data. When shear waves propagate in anisotropic media containing fractures, shear wave splitting occurs, forming fast shear waves and slow shear waves, and the difference between fast and slow shear waves is proportional to the development of formation fractures, so the shear wave splitting phenomenon mainly reflects is crack information. The relevant research on the velocity and amplitude attenuation of core compressional and shear waves is helpful for a more comprehensive understanding of the pore struct...

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Application Information

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IPC IPC(8): G01N29/11
CPCG01N29/11G01N2291/015G01N2291/0232G01N2291/0422
Inventor 章成广郑恭明唐军陈义群
Owner YANGTZE UNIVERSITY
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