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Method and system for calculating frequency change AVO response of directionally-cracked pore medium

A technology for fractured pores and media, which is applied to the field of calculating the frequency-dependent AVO response of porous media containing directional fractures, and can solve problems such as the calculation of frequency-dependent AVO responses that are not applicable to oriented fractured porous media

Active Publication Date: 2017-12-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The inventors have found that various analytical methods in the prior art are not applicable to the calculation of the frequency-dependent AVO response of a porous medium containing oriented fractures with medium properties of transverse isotropy (VTI)

Method used

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  • Method and system for calculating frequency change AVO response of directionally-cracked pore medium
  • Method and system for calculating frequency change AVO response of directionally-cracked pore medium
  • Method and system for calculating frequency change AVO response of directionally-cracked pore medium

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Embodiment 1

[0023] figure 1 A flowchart showing the steps of a method of computing a frequency-dependent AVO response of a porous medium containing oriented fractures. In this embodiment, the method for calculating the frequency-dependent AVO response of a porous medium containing oriented fractures according to the present invention may include: Step 101, establishing a formation model containing a porous medium containing oriented fractures based on the Brajanovski model, and obtaining the longitudinal wave of the porous medium containing oriented fractures Bulk modulus; step 102, based on the longitudinal wave bulk modulus of the porous medium containing oriented fractures, and multiple low-frequency limiting elastic stiffness coefficients and multiple high-frequency limiting elastic stiffness coefficients, obtain the elastic stiffness coefficient of the porous medium containing oriented fractures; And step 103, based on the elastic stiffness coefficient of the porous medium containing...

Embodiment 2

[0120] According to an embodiment of the present invention, a system for calculating the frequency-dependent AVO response of a porous medium containing oriented fractures is provided, and the system may include: establishing a formation model of a porous medium containing oriented fractures based on the Brajanovski model, and obtaining A unit of the longitudinal wave bulk modulus of the porous medium; used to obtain the porous medium containing the oriented fractures based on the longitudinal wave bulk modulus of the porous medium containing the oriented fractures, and multiple low-frequency limit elastic stiffness coefficients and multiple high-frequency limit elastic stiffness coefficients and a unit for obtaining the frequency-dependent AVO response of the porous medium containing oriented fractures based on the elastic stiffness coefficient of the porous medium containing oriented fractures and the Zoeppritz equation of the viscoelastic VTI medium.

[0121] In this embodime...

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Abstract

The invention discloses a method and system for calculating frequency change AVO response of a directionally-cracked pore medium. The method can comprise the steps of: establishing a stratigraphic model of the directionally-cracked pore medium based on a Brajanovski model, and acquiring a longitudinal wave volume modulus of the directionally-cracked pore medium; acquiring an elastic rigidity coefficient of the directionally-cracked pore medium based on the longitudinal wave volume modulus of the directionally-cracked pore medium, as well as a plurality of low-frequency limit elastic rigidity coefficients and a plurality of high-frequency limit elastic rigidity coefficients; and acquiring the frequency change AVO response of the directionally-cracked pore medium based on the elastic rigidity coefficient of the directionally-cracked pore medium and a Zoeppritz equation of a viscoelastic VTI medium.

Description

technical field [0001] The invention relates to the field of seismic exploration, more specifically, to a method and system for calculating the frequency-varying AVO response of a porous medium containing directional fractures. Background technique [0002] In the field of seismic exploration, it is necessary to study the attenuation and dispersion characteristics of reservoirs. Usually, the velocity dispersion and attenuation phenomenon of rock matrix or dry rock formation is not obvious, but the attenuation and dispersion are particularly obvious in the porous rock of oil and gas reservoirs. The dispersion and attenuation of the reservoir are finally manifested as the change of reflection coefficient with frequency, that is, frequency-dependent AVO (amplitude with offset) response. Therefore, studying the frequency-dependent AVO response of seismic waves is the key theoretical basis for using dispersion characteristics to detect reservoirs and even identify fluids. [00...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor 杨小慧
Owner CHINA PETROLEUM & CHEM CORP
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