Numerical Calculation Method of Seismic Wave Dispersion and Attenuation Considering Heterogeneous Differences in Seepage of Fractured Pore Rocks
A seismic wave, non-uniform technology, applied in the fields of seismic wave propagation and petrophysics, which can solve problems such as limiting oil and gas seismic exploration applications, difficult to achieve reliable guidance, not considering micro-scale and meso-scale pore space differences and non-uniformity.
Active Publication Date: 2022-04-12
CHENGDU UNIVERSITY OF TECHNOLOGY
View PDF14 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In the numerical analysis of the current fracture-pore rock physical model, the fracture-pore rock is usually regarded as a whole, and the internal permeability is simply set as a uniform constant value, without considering the seepage characteristics of the fluid in the actual fracture-pore The differences and inhomogeneities existing in the micro-scale and meso-scale pore spaces inside rocks, and the influence of such differences and inhomogeneities on the seismic wave dispersion and attenuation characteristics in rocks, due to this limitation, make fluid-bearing fractures The numerical analysis results of pore rock physics are difficult to reliably describe the seismic wave dispersion and attenuation response characteristics and rules of the actual underground rock medium. , it will be difficult to achieve reliable guidance, limiting its application in oil and gas seismic exploration
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0021] (1) Given a fracture-porous rock model containing spherical pores, micro-cracks and fractures, the initial velocities of P-wave and S-wave in the background medium of the model are respectively The density of the background medium is ρ o ; In the model, the porosity and radius of spherical pores are: and a p , the density and radius of microcracks are: ε c and a c , the density, radius and aspect ratio of cracks are respectively: ε f , a f and r; in the model, shaped pores and microcracks belong to the microscopic pore space, and their permeability is κ 1 , the fracture belongs to the mesoscale pore space, and the permeability is κ 2 , there are non-uniform differences in the permeability of different scales of pore space inside the rock, then there is κ 1 ≠κ 2 , the bulk modulus of the fluid filled in the pore space is K f ;
[0022] (2) According to the initial velocities of compressional and shear waves in the background medium of the rock model and...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the fields of seismic wave propagation and rock physics, and proposes a numerical calculation method for seismic wave dispersion and attenuation considering the non-uniform difference of seepage in fractured and porous rocks. It considers the difference and non-uniformity of permeability in different scale pore spaces inside the fluid-containing fractured porous rock medium, and firstly establishes the calculation method of the fluid flow correction relaxation time in the micro-scale pore space and mesoscale pore space inside the rock, and then The modified stress coefficient set and anisotropic elastic tensor coefficient of the calculation model can realize the numerical calculation of velocity dispersion and attenuation that is more in line with the actual rock seismic wave propagation characteristics, and can analyze the seismic wave velocity dispersion and attenuation of oil and gas reservoirs with complex seepage conditions. Response features for more precise numerical analysis.
Description
technical field [0001] The invention belongs to the field of seismic wave propagation and petrophysics, and relates to the simulation of seismic wave propagation characteristics and rules in fluid-containing fractured porous rocks, considering the actual situation of differences and non-uniformity in permeability in different scale pore spaces inside fluid-containing rock media , a numerical calculation method for the velocity dispersion and attenuation that occurs when seismic waves propagate through rocks. Background technique [0002] It is of great significance in the field of oil and gas seismic exploration to determine the dispersion and attenuation change law and mechanism of seismic waves in fluid-bearing fractured porous media. Many scholars at home and abroad have done a lot of exploration and in-depth research on the dispersion and attenuation of seismic waves in fluid-containing fractured porous media in terms of theoretical research, laboratory observation and n...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/303G01V1/306G01V2210/6222G01V2210/6246
Inventor 陈学华刘芸菲张杰徐斌姜晓敏黎康毅蒋伟
Owner CHENGDU UNIVERSITY OF TECHNOLOGY