A multi-wave avo joint inversion method for sand-shale thin interbedded media

A joint inversion and thin interbed technology, which is applied in the field of seismic exploration, can solve the problems that the inversion of thin interbed media cannot be applied, and the internal parameters and interbed structure of thin interbeds cannot be inverted.

Active Publication Date: 2020-03-06
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

Such an inversion method cannot be applied to the inversion of thin interbed media in terms of inversion principle and accuracy, and cannot invert the internal parameters and interlayer structure of thin interbedsN / G

Method used

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  • A multi-wave avo joint inversion method for sand-shale thin interbedded media
  • A multi-wave avo joint inversion method for sand-shale thin interbedded media
  • A multi-wave avo joint inversion method for sand-shale thin interbedded media

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Embodiment Construction

[0074] The present invention will be further described below. It should be noted that this embodiment provides detailed implementation and specific operation process based on the premise of this technical solution, but the protection scope of the present invention is not limited to this embodiment.

[0075] The basic principle of a multi-wave AVO joint inversion method for thin sand-shale interbedded media provided in this embodiment will be described in detail below.

[0076] 1. VTI medium reflection coefficient equation

[0077] The Zoeppritz equation is based on the isotropic theory, and for the VTI medium, the anisotropic equation proposed by Ruger is used in this embodiment [11] Rearranging and transforming it into the reflection coefficient equation for wave impedance difference, density difference and anisotropy parameter difference is shown in formula (1), which lays the foundation for subsequent parameter inversion of VTI media.

[0078]

[0079] in,

[0080] V...

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Abstract

The invention discloses a multi-wave AVO joint inversion method for a sand-shale thin interbed medium. The method comprises the following steps: for a complex thin interbed medium, adopting a VTI medium reflection coefficient equation proposed by Ruger, firstly using the pre-stack AVA corner gather to invert five parameters of an equivalent VTI medium, and then using the parameters of the VTI media and a relationship between its internal single-layer parameters and N / G to reverse the parameters of sandstone and mudstone in the thin interbed and the interbed structure N / G, wherein the result shows that the inversion can always achieve satisfactory effect for whether the VTI medium or the internal parameters of the thin interbed.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a multi-wave AVO combined inversion method for thin sand-shale interbedded media. Background technique [0002] With the continuous deepening of oil and gas exploration, the simple structural oil and gas reservoirs have been fully developed, and the future exploration focus will be on subtle lithologic oil and gas reservoirs. In some basins in eastern and western my country, most Mesozoic and Cenozoic oil and gas-bearing basins are dominated by thin sandstone and mudstone deposits [1] . Sand bodies in thin interbedded reservoirs are usually in the form of strips, with a large number and a thickness much smaller than the seismic exploration resolution, and the lithology and thickness change rapidly in the lateral direction, so there are big problems in the exploration of thin interbedded reservoirs . Since it is difficult to distinguish thin interbeds in the seismic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/30
Inventor 芦俊安莹王赟
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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