A Calculation Method of Acoustic Velocity in Transversely Isotropic Rocks Containing Parallel Fractures
A technology of transverse isotropy and sound wave velocity, which is applied in the field of exploration geophysics, can solve the problems of difficult application, complex model results, and no explicit calculation formula of elastic parameters, etc., and achieve accurate sound velocity prediction results
Inactive Publication Date: 2019-08-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0006] (2) Partially considering the TI (Transverse isotropy, transverse isotropy) background medium, the model results are complex, and the calculation formula of the elastic parameters is not explicitly given, which is difficult to apply
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[0023] Below in conjunction with specific embodiment and Figure 1-3 , the technical solution of the present invention is introduced in detail.
[0024] A method for calculating the velocity of sound waves in transversely isotropic rocks containing parallel fractures, comprising the following steps:
[0025] S1. Measure the experimental parameters of transversely isotropic rocks without parallel fractures. The experimental parameters include rock density ρ and anisotropic sound velocity. The sound velocity includes longitudinal waves with an angle of 0 degrees between the incident wave and the isotropic plane Speed V p (90°), the longitudinal wave velocity V with an included angle of 45° p (45°), the included angle is 90 degrees, the longitudinal wave velocity V p (0°), the shear wave polarization direction is parallel to the V of the isotropic plane SH and V perpendicular to the isotropic plane SV ;
[0026] S2. According to the experimental parameters measured in ste...
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Abstract
The invention provides an acoustic wave velocity calculation method of transversely isotropic rocks with parallel fractures. The method includes the steps: S1 measuring experimental parameters of thetransversely isotropic rocks without parallel fractures; S2 calculating the elastic rigidity matrix coefficient of the rocks according to the experimental parameters measured in the step S1; S3 performing CT (computer tomography) scanning experiments on the transversely isotropic rocks with the fractures to obtain fracture parameters; S4 calculating normal fracture flexibility ZN and tangential fracture flexibility ZT according to the parameters acquired in the steps S2 and S3; S5 calculating the elastic rigidity matrix Ceff of the transversely isotropic rocks with the fractures according to the ZN and the ZT acquired in the step S4; S6 calculating acoustic wave velocity according to the elastic rigidity matrix Ceff coefficient acquired in the step S5. Acoustic velocity prediction resultsare more accurate, the elastic properties of the rocks with the fractures can be more effectively predicted, and support can be provided for seismic exploration, logging recognition and fracture reservoir evaluation.
Description
technical field [0001] The invention relates to the field of exploration geophysics, in particular to a method for calculating the velocity of sound waves of rocks with parallel fractures and transverse isotropy in rock physics. Background technique [0002] Fractures are an important feature of geological structures and are widely distributed in formations. Although the content of fractures in rocks is relatively low, in tight formations, fractures have a great influence on the seepage properties of formations. Due to the small fracture aspect ratio, a small number of fractures will significantly reduce the rock elastic modulus. Moreover, fractures are easy to close under pressure, which makes the effect of increasing pressure on rock modulus more significant. Therefore, we must consider the influence of fractures when calculating and predicting the equivalent elastic properties and sound velocity of rocks. [0003] Currently, there are two commonly used methods to evalu...
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IPC IPC(8): G01N29/07
CPCG01N29/07
Inventor 韩同城郭俊鑫徐登辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)