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Viscoelastic wave frequency variation anisotropy forward modeling method for partially saturated rock

An anisotropic and forward modeling technology, applied in the field of seismic exploration, can solve problems such as inelasticity and non-uniformity, and achieve the effect of convenient operation and accurate simulation results

Pending Publication Date: 2022-06-28
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

However, in practice, the inelasticity, inhomogeneity, and anisotropy shown by the earth's medium have seriously challenged the traditional theory of uniform and completely elastic media.

Method used

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  • Viscoelastic wave frequency variation anisotropy forward modeling method for partially saturated rock
  • Viscoelastic wave frequency variation anisotropy forward modeling method for partially saturated rock
  • Viscoelastic wave frequency variation anisotropy forward modeling method for partially saturated rock

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Embodiment Construction

[0137] The present invention comprises the following steps:

[0138] 1) Construct the viscous Chapman model of the viscoelastic wave medium:

[0139] First, based on the pore-elasticity theory of particle jets, combined with mesoscopic-scale coin-shaped fractures, and considering the interaction between the two, the Chapman model in isotropic media is obtained, as shown in equation (1):

[0140]

[0141] where: C ij (w) is the element in the i-th row and the j-th column of the frequency-dependent stiffness matrix under the Chapman model of the isotropic medium, and w is the angular frequency; is the element of the i-th row and the j-th column in the isotropic elastic matrix; and are the elements in the i-th row and the j-th column of the correction value matrix related to pores, fissures and fractures, respectively; φ p is the porosity of spherical pores; ε c is the microcrack density; ε f is the crack density; where i=1,2,3,4,5,6, j=1,2,3,4,5,6.

[0142] When the...

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Abstract

The invention discloses a viscoelastic wave frequency variation anisotropy forward modeling method for partially saturated rock, which comprises the following steps of: 1) constructing a viscosity Chapman model of a viscoelastic wave medium, and establishing the viscosity Chapman model of the viscoelastic wave medium by combining a Kelvin model, a Maxwell model or a Boltzmann model of the viscoelastic wave medium based on a Chapman model of an isotropic medium; and 2) on the basis of the viscosity Chapman model in the step 1), constructing a new unified wave propagation model which simultaneously contains a jet flow mechanical mechanism and a plaque effect in a viscoelastic wave frequency-variable anisotropic medium. The method is convenient to operate, seismic anisotropy and fluid parameters in the fractures can be associated, the influence of partial saturation of the fractured reservoir on viscoelastic wave frequency variation anisotropy can be simulated, and the simulation result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, in particular to a viscoelastic wave frequency-dependent anisotropy forward modeling method for partially saturated rocks. Background technique [0002] The correct description of fractures is one of the key issues in the field of oil and gas seismic exploration. Seismic anisotropy is the most commonly used method to describe fracture characteristics. It is the dependence of seismic attributes (velocity, amplitude, polarization, attenuation) on the direction of wave propagation. relation. In addition, saturated fluid properties also heavily influence this dependency. Therefore, the accurate description of fractured rocks requires a clear understanding of the effect of fluids on seismic anisotropy characteristics. [0003] In recent years, scholars have increasingly studied the effect of dispersion on the generation of reflection coefficients, which are used to estimate fluid saturat...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30G01V2210/66
Inventor 廖建平张青郭俊鑫刘和秀周林徐云贵龙文高王立歆
Owner HUNAN UNIV OF SCI & TECH
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