Two-phase medium amplitude versus offset (AVO) forward modeling method based on triple constraints

A dual-phase medium and condition technology, applied in seismic signal processing and other directions, can solve problems such as low calculation accuracy, restricting the application of equations, and reducing inversion multiple solutions.

Active Publication Date: 2012-11-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

But the difficulty lies in solving the "reflection and transmission coefficient equations". For example, the equations of Wang Shangxu (1990) need to set six parameters of the two-phase medium (σ 11 , σ 22 , σ 12 , γ 11 , γ 22 , γ 12 ), the equations of Mou Yongguang (1996) need to set 10 parameters of the two-phase medium (A, N, Q, R, ρ 11 , ρ 22 , ρ 12 、m 1 、m 2 , V 2 ), which restricts the practical application of the equations
It is worth noting that Yong Xueshan (2006) based on the inversion of rock physical parameters (matrix minerals and elastic parameters of rock skeleton), established two-phase medium parameters (A, N, Q, R, ρ 11 , ρ 22 , ρ 12 、m 1 、m 2 , V 2 ) and P-wave velocity, S-wave velocity, density, po

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  • Two-phase medium amplitude versus offset (AVO) forward modeling method based on triple constraints
  • Two-phase medium amplitude versus offset (AVO) forward modeling method based on triple constraints
  • Two-phase medium amplitude versus offset (AVO) forward modeling method based on triple constraints

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[0046] Exemplary embodiments of the present invention will now be described in detail hereinafter; however, exemplary embodiments of the present invention may be embodied in many different forms and should not be limited to examples set forth herein. Rather, these examples are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0047] The specific implementation steps of the two-phase medium AVO forward modeling method based on triple conditional constraints according to an exemplary embodiment of the present invention will be described in detail below.

[0048] (1) Input the P-wave velocity (V P ), shear wave velocity (V S ), density (ρ), porosity (φ) (for example, the test value of well logging can be used directly), and refer to the rock physical test data to set the bulk modulus (K 0 ) and shear modulus (μ 0 ), the density of pore fluid (ρ f ) and speed (V f ), the value range ...

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Abstract

The invention provides a two-phase medium amplitude versus offset (AVO) forward modeling method based on triple constraints. The two-phase medium AVO forward modeling method based on triple constraints comprises the following steps of: (1) calculating bulk modulus of a fluid saturation rock; (2) setting a pore flattening value; (3) calculating bulk modulus of a rock matrix, and constraining the bulk modulus by employing the first constraint; (4) calculating elastic parameters of a two-phase medium; (5) calculating two roots of an equation of Biot (1956), and constraining the roots by employing the second constraint; (6) calculating the speed of slow longitudinal waves, and constraining the speed by employing the third constraint; (7) calculating the bulk modulus of the rock matrix, and calculating the parameters of the two-phase medium; and (8) calculating reflection and transmission coefficients of a two-phase medium model. Therefore, the pore flattening of the rock serves as an object; constraint inversion is performed by employing the triple constraints; and the inversion precision and reliability are effectively improved.

Description

technical field [0001] The invention relates to the AVO (Amplitude Versus Offset, amplitude varies with offset) forward modeling problem in the field of exploration geophysics, and is a dual-phase medium AVO forward modeling method based on triple condition constraints, which is used to solve conventional dual-phase medium In the AVO forward modeling method, it is difficult to accurately set the petrophysical parameters of the rock, which effectively improves the accuracy and reliability of the dual-phase medium AVO forward modeling method. Background technique [0002] Dual-phase medium is a medium composed of solid rock and fluid in pores, which can accurately describe the actual formation structure and properties. Based on the conventional two-phase medium theory (Biot, 1956; Geertsma, 1961), Wang Shangxu (1990) derived the reflection and transmission coefficient equations of the two-phase medium similar to the Zoeppritz equation, which laid the foundation for the AVO for...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 黄东山邹文李忠陈爱萍洪余刚符志国张洞君吴秋波贺振华熊晓军
Owner BC P INC CHINA NAT PETROLEUM CORP
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