Method and device for predicting transverse wave speed of seismic rock

A technology of shear wave velocity and prediction method, applied in seismic signal processing, seismology for logging records, etc., can solve the problem of not considering the effect of effective pressure on rock modulus and compression and shear wave velocity, etc.

Active Publication Date: 2019-08-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for predicting seismic rock shear wave velocity, which is used to solve the technical prob

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  • Method and device for predicting transverse wave speed of seismic rock
  • Method and device for predicting transverse wave speed of seismic rock
  • Method and device for predicting transverse wave speed of seismic rock

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[0024]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in 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, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] This example proposes a petrophysical model considering the effect of effective pressure. By simulating the effect of effective pressure on rock modulus, the velocity of longitudinal and shear waves of rock under different pressures is calculated, and a method that can be used for different effective pressure without laboratory measurement is established. A rock physics modeling method...

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Abstract

The invention discloses a method and a device for predicting a transverse wave speed of a seismic rock. The method comprises the steps of acquiring logging data of the seismic rock; determining an equivalent volume modulus of a rock matrix by using an SCA model based on the logging data; determining a shear modulus of the rock matrix by using the SCA model based on the logging data; determining anequivalent volume modulus of a pore fluid based on the logging data; determining an effective pressure of the rock matrix based on the logging data; determining the pore stiffness based on a linear relation between a ratio k of the pore stiffness to the equivalent volume modulus of the rock matrix, and the effective pressure; based on the equivalent volume modulus of the rock matrix, the equivalent volume modulus of the pore fluid, the pore stiffness and the porosity, determining an equivalent volume modulus of a saturated rock through a Gassmann fluid replacement model; and based on the equivalent volume modulus of the saturated rock and the shear modulus of the rock matrix, determining a longitudinal wave speed and the transverse wave speed of the saturated rock. The influence of the effective pressure is introduced in modeling, so that the accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of seismic rock analysis, in particular to a method and device for predicting shear wave velocity of seismic rock. Background technique [0002] The effective pressure is the difference between the confining pressure of the rock and its pore pressure, and is an important factor affecting the rock modulus and the velocity of compressional and shear waves. Rock physical modeling is an important means of seismic rock physics research, which can guide the study of reservoir characteristics and the exploration and development of oil and gas resources. The petrophysical model is an equivalent approximation to complex rocks based on the two-phase medium and equivalent medium theory, so as to carry out subsequent petrophysical analysis. The accuracy of the rock physics model determines the correctness of the rock physics analysis results, which in turn affects the accuracy of shear wave prediction and pre-stack inv...

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Application Information

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IPC IPC(8): G01V1/50
CPCG01V1/50
Inventor 宗兆云姜曼印兴耀
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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