Method for inverting rock pore distribution characteristics by utilizing pore and fracture medium elastic wave theory

A pore distribution, elastic wave technique, applied in the field of rock physics

Active Publication Date: 2021-03-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for inverting the distribution characteristics of rock pores using the elastic wave theory of pores and fractured media, so as to solve the problem of further expanding the traditional theory to include the interaction of pores and multi-form fracture systems. The chan

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  • Method for inverting rock pore distribution characteristics by utilizing pore and fracture medium elastic wave theory
  • Method for inverting rock pore distribution characteristics by utilizing pore and fracture medium elastic wave theory
  • Method for inverting rock pore distribution characteristics by utilizing pore and fracture medium elastic wave theory

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Example Embodiment

[0184] Embodiment Example 1: Kayenta sandstone (saturated longitudinal wave velocities)

[0185] Kayenta sandstone first treated with inversion (Coyner, 1984) of the core measurements, Kayenta sandstone rocks with good porosity, a porosity of 22.2%, skeletal density of 2017kg / m 3 Permeability taken as 63mD, the frequency of sound speed measurement is 1MHz, the effective range of the pressure of 1MPa to 70Mpa experiment, Figure 2-a This gives the saturated sandstone samples under conditions benzene longitudinal, transverse velocity varies with the pressure measurement data (circle Identifier). Bulk modulus and shear modulus of the rock matrix inversion and respectively 31.00GPa 24.04GPa.

[0186] existFigure 2-a , The abscissa is the effective pressure (MPa), the ordinate is velocity (m / s), the black circles under saturation conditions is a longitudinal measurement of wave velocity; solid black, represented by a dashed line inversion rock elastic modulus and fracture saturated ...

Example Embodiment

[0190] Embodiment Example 2: Navajo sandstone (United saturated, dried longitudinal wave velocities)

[0191] The following process Navajo sandstone core by inversion method of the present invention measurement data (Coyner, 1984), Navajo sandstone more dense, porosity of 11.8%, skeletal density of 2316kg / m 3 , The frequency of sound speed measurement is 1MHz, the effective range of the pressure of 1MPa to experiment 100MPa. Figure 3-a In benzene saturated given vertical under dry conditions measured shear wave velocity varies with the pressure data (circular Identifier). Example 1 is different from, we take saturated, dried longitudinal, shear wave velocity joint inversion. In particular, for the sand, in order to better fit the data, we focused in the inversion saturation, drying conditions both conditions are provided two rock matrix shear modulus, bulk modulus of the rock matrix inversion, saturated (dried) matrix shear modulus were 36.60Gpa, 35.00 (32.50) Gpa.

[0192] exis...

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Abstract

The invention discloses a method for inverting rock pore distribution characteristics by utilizing a pore and fracture medium elastic wave theory. The method comprises the following processing steps of: 1, measuring saturation and drying speeds of a rock core under different pressures, and determining properties such as rock density; 2, simulating an elastic wave velocity of a rock by using a porefracture theory of polymorphic fractures; 3, calculating a pore aspect ratio spectrum under different pressure points according to the pore aspect ratio spectrum under the effective pressure of 0 forfractures with various forms in the rock; 4, establishing an inversion objective function; 5, setting fractures with various aspect ratios, wherein the fractures comprise pores; and 6, repeatedly adjusting the aspect ratio and the fracture density of each form of fracture of the rock under the effective stress of 0 to enable the objective function to reach the minimum value, so as to obtain the pore aspect ratio spectrum of the rock under each pressure point. The method can obtain rock pore structure characteristics more accurately, and analyze the mechanical, acoustic and fluid permeabilityproperties of the rock.

Description

technical field [0001] The invention belongs to the field of rock physics, and in particular relates to a method for inverting the distribution characteristics of rock pores by using the elastic wave theory of pores and cracked media. Background technique [0002] The distribution characteristics of pores in rocks have a very important impact on the mechanical, acoustic and fluid permeability properties of rocks, and are the focus of reservoir rock acoustics. Measured by the parameter of aspect ratio, the remarkable feature of rock pore distribution is that it contains pores with aspect ratio ~1 and fractures with aspect ratio <<1, and the distribution of fractures with different shapes can be well described by aspect ratio spectrum. Determining the aspect ratio spectrum of rock pores has been a research direction of rock physics for many years; elastic wave velocity measurement under experimental pressure loading conditions provides an effective way for this research....

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6242
Inventor 唐晓明王鹤鸣苏远大陈雪莲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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