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Fluid elastic impedance inversion technology

A fluid elasticity and inversion technology, applied in seismic signal processing, seismology for logging records, etc., can solve problems such as reducing the reliability of fluid indication

Inactive Publication Date: 2010-01-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

In practical applications, it is found that different fluid factors have different sensitivities to fluid indicators in different work areas, and at present, the calculation methods of fluid factors mostly use indirect calculation methods that rely on elastic parameters for algebraic operations, which inevitably introduces the error accumulation process, reducing the reliability of fluid indication

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  • Fluid elastic impedance inversion technology
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Embodiment Construction

[0023] Fluid elastic impedance inversion technology converts the interface information of underground formations into elastic parameter information reflecting formation information through seismic inversion. After reservoir fluid sensitivity analysis, we select the most sensitive elastic parameters for corresponding reservoir prediction and analysis. Fluid identification. The present invention starts from inverting the fluid parameters in the Gassmann theory, and proposes a concept of fluid impedance (Fluid Elastic Impedance, referred to as FEI) based on the reflection coefficient formula of porous elastic media proposed by Russell. Through the inversion results of FEI The calculation can directly extract the fluid factor f, which broadens the application range of the fluid factor and improves the accuracy and efficiency of reservoir prediction and fluid identification.

[0024] (1) Basic principle:

[0025] The concept of fluid elastic impedance (Fluid Elastic Impedance, ref...

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Abstract

The invention relates to a fluid elastic impedance inversion technology. The technology comprises the following steps: transforming interface information of a subsurface layer into elastic parameter information reflecting earth layer information by seismic inversion, electing the most sensitive elastic parameters by sensitivity analysis of reservoir fluid, and performing corresponding reservoir prediction and fluid identification; taking fluid parameters in Gassmann inversion theory as a starting point and a reflection coefficient formula of a porous elastic medium proposed by Russell as a basis, and directly extracting a fluid factor f, a shear modulus Mu showing a rock matrix structure and a density parameter Rho by computing FEI inversion results. The technology can help obtain ideal fluid identification effect.

Description

technical field [0001] The invention belongs to the field of seismic data processing and interpretation, and relates to a hydrocarbon detection method using pre-stack seismic data. Background technique [0002] With the deepening of petroleum exploration and development, oil and gas reservoirs are becoming more and more complex, and people hope to extract more information reflecting reservoir fluids from seismic data. In response to this problem, many scholars have proposed different fluid indicator factors to more effectively predict reservoirs, such as λρ, μρ, Poisson’s ratio, fluid factor ρf based on Gassmann’s theory, etc. In practical applications, it is found that different fluid factors have different sensitivities to fluid indicators in different work areas, and at present, the calculation methods of fluid factors mostly use indirect calculation methods that rely on elastic parameters for algebraic operations, which inevitably introduces the error accumulation proce...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/28G01V1/36
Inventor 印兴耀张繁昌张世鑫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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