Nonlinear AVO inversion method and apparatus

A nonlinear and inversion technology, applied in the field of nonlinear AVO inversion devices, can solve the problems of low computational efficiency, low precision of inversion results, large amount of computation, etc., and achieve the effect of high computational efficiency

Inactive Publication Date: 2017-09-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] In general, in the prior art, the linear AVO formula is currently the most widely used AVO inversion technology, and its calculation efficiency is high, but the accuracy of the inversion result of the linear approximation formula is low; while the nonlinear AVO inversion such as Newton iteration can reach High inversion accuracy, but its calculation complexity is difficult to control, the average calculation amount is large, and the calculation efficiency is low

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  • Nonlinear AVO inversion method and apparatus
  • Nonlinear AVO inversion method and apparatus
  • Nonlinear AVO inversion method and apparatus

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Embodiment 1

[0043] figure 1 A flow chart of a method for nonlinear longitudinal wave AVO inversion according to an embodiment of the present invention is shown. The method can include:

[0044] Step 101, obtain the prestack angle gather data, the prestack angle gather data includes N incident angles θ i Corresponding longitudinal wave reflection coefficient R pp (θ i ), i=1,2,...,N;

[0045] Step 102, will Respectively expanded as the rate of change of P-wave velocity r α , rate of change of shear wave velocity r β , Density change rate r ρ Substituting it into the Zoeppritz equations to get the Taylor series of Equation 5:

[0046] R pp (θ) = R pp1 (θ)+R pp2 (θ)+...+R ppK (θ), Equation 5

[0047] Among them, R ppk (θ) only includes the rate of change of P-wave velocity r α , rate of change of shear wave velocity r β , Density change rate r ρ The k-order term of k=1,2,...,K, α 1 , β 1 , ρ 1 represent the P-wave velocity, S-wave velocity and density of the upper layer ...

Embodiment 2

[0091] The invention also discloses a nonlinear longitudinal wave AVO inversion device, which may include a data acquisition unit, a formula construction unit and an inversion unit.

[0092] The data acquisition unit is used to obtain prestack angle gather data, and the prestack angle gather data includes N incident angles θ i Corresponding longitudinal wave reflection coefficient R pp (θ i ), i=1,2,...,N.

[0093] The formula building block for the Respectively expanded as the rate of change of P-wave velocity r α , rate of change of shear wave velocity r β , Density change rate r ρ and substituting it into the Zoeppritz equations to get Equation 5:

[0094] R pp (θ) = R pp1 (θ)+R pp2 (θ)+...+R ppK (θ), Equation 5

[0095] Among them, θ represents any incident angle, R ppk (θ) only includes the rate of change of P-wave velocity r α , rate of change of shear wave velocity r β , Density change rate r ρ The k-th order term, k=1,2,...,K, K>1, α 1 , β 1 , ρ 1 re...

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Abstract

The invention discloses a method and a device for nonlinear longitudinal wave AVO inversion. The device includes: obtaining pre-stack angle gather data, said pre-stack angle gather data including longitudinal wave reflection coefficients Rpp(θi) corresponding to N incident angles θi, i=1, 2,...,N; respectively expanded as The Taylor series of the P-wave velocity change rate rα, S-wave velocity change rate rβ, and density change rate rρ are substituted into the Zoeppritz equations, and the P-wave reflection coefficient is expressed as the high-order nonlinearity of P-wave velocity change rate, S-wave velocity change rate, and density change rate. Linear function; invert rα, rβ, rρ based on prestack angle gather data and this formula. By applying the invention, the change rate of the elastic parameter with high precision can be obtained by inversion, and the calculation efficiency is high.

Description

technical field [0001] The present invention relates to the technical field of oil and gas geophysics, and more specifically, to a nonlinear AVO inversion method and a nonlinear AVO inversion device. Background technique [0002] AVO (Amplitude variation with offset) is the characteristic that the seismic wave reflection amplitude changes with the offset (also called offset). AVO analysis is a technique for lithology identification and oil and gas detection using the characteristics of reflection amplitude variation with offset, and its theoretical basis is seismic reflection and transmission theory. Using AVO characteristics can directly invert rock density, P-wave velocity and S-wave velocity, quantitatively describe seismic reservoirs, extract information reflecting lithology and oil and gas, and make full use of the potential of non-zero offset seismic information in pre-stack seismic records. [0003] Zoeppritz (1919) derived the Zoeppritz equation describing the displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 陈天胜刘春园刘韬刘炯季玉新
Owner CHINA PETROLEUM & CHEM CORP
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