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Cross-scale seismic rock physical attenuation model and method for predicating attenuation and dispersion

A petrophysics, attenuation model technology, applied in the field of exploration physical geology, can solve the problem of not considering the impact and so on

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these models can describe the attenuation of seismic waves in the seismic frequency band, they do not consider the influence of microscopic cracks on seismic waves in the seismic frequency band

Method used

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  • Cross-scale seismic rock physical attenuation model and method for predicating attenuation and dispersion
  • Cross-scale seismic rock physical attenuation model and method for predicating attenuation and dispersion
  • Cross-scale seismic rock physical attenuation model and method for predicating attenuation and dispersion

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Effect test

Embodiment 1

[0073] Example 1. The cross-scale seismic rock physical attenuation model is characterized in that: the model is a model for simulating the characteristics of underground oil-gas dual-phase media, and comprehensively considers the attenuation mechanisms of macroscale, mesoscale and microscale. Under the conditions, the attenuation and dispersion of seismic waves in the seismic frequency band can be predicted.

[0074] The way to build this model is:

[0075] Under the framework of the elastic wave theory of Biot two-phase media at the macro scale, the influence of the "jet flow" of the micro-scale cracks in the "BISQ" elastic wave theory is introduced. The aquifer and the gas-bearing layer are superimposed alternately, each layer extends infinitely laterally, and is an isotropic medium, and the thickness of each layer is much smaller than the seismic wavelength and larger than the particle size; the governing equation of each layer is "BISQ" elastic fluctuation Equations to ...

Embodiment 2

[0089] Example 2. The method for predicting the compressional wave attenuation and dispersion of the above-mentioned cross-scale seismic rock physics attenuation model includes: using Dutta’s double decoupling method to solve the solid displacement of the upper and lower interfaces of the characteristic unit in the model, and then obtain the plane wave modulus of the characteristic unit, Finally, the attenuation and dispersion of the cross-scale seismic rock physics attenuation model are obtained.

[0090] The solid displacement of the upper and lower interfaces of the characteristic unit in the described solution model, and then the specific method for obtaining the plane wave modulus of the characteristic unit is:

[0091] For each characteristic unit in the model, when a simple harmonic force is applied from the outside (simulating longitudinal wave propagation), the characteristic element will produce uniaxial strain θe net , so the equivalent plane wave modulus of the ...

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Abstract

The invention discloses a cross-scale seismic rock physical attenuation model and a method for predicating attenuation and dispersion. The model simulates characteristics of underground oil-gas-bearing double-phase medium, and adopts the construction structure that the influence of a jet flow of a micro-scale fracture in a BISQ elastic wave prorogation theory is introduced under the framework of a macro-scale Biot double-phase medium wave prorogation theory; a periodic stratification White module under mesoscale is introduced, so as to ensure that water-bearing stratums and gas-bearing stratums are alternatively and periodically overlaid; the horizontal direction of each stratum is infinitely extended; each stratum adopts isotropic medium; the thickness of each stratum is far less than seismic wavelength and is greater than the particle size; the control equation of each stratum adopts a BISQ elastic wave prorogation equation, so that the cross-scale seismic rock physical attenuation model is constructed. The model comprises three scale attenuation mechanisms, namely a micro-scale Biot flow, a mesoscale local flow and the micro-scale jet flow. The invention further discloses a method for predicating the longitudinal wave attenuation and dispersion of the model. A predicated attenuation value is very consistent with an attenuation value measured by experiments.

Description

technical field [0001] The invention relates to the field of exploration physical geology, in particular to a cross-scale seismic rock physics attenuation model and a method for predicting attenuation and dispersion. Background technique [0002] Underground oil and gas oil and gas media show obvious characteristics of two-phase media in terms of elasticity, and the study of the propagation law of seismic waves in two-phase media is of great significance for improving the accuracy of oil and gas exploration. The propagation of seismic waves in a two-phase medium induces fluid flow (WIFF), which in turn produces seismic wave attenuation and dispersion (Müller, 2010). When the seismic wave passes through, due to the uneven distribution of rock skeleton or pore fluid, a pressure gradient is generated, which leads to attenuation and dispersion caused by fluid flow. Seismic rock physics theories related to fluid-related seismic wave absorption and attenuation can be divided into...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 王延光刘浩杰李红梅王兴谋吴国忱魏文王树刚唐杰王凡剑胡贤根
Owner CHINA PETROLEUM & CHEM CORP
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