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Reflection coefficient correction method and system

A technology of reflection coefficient and longitudinal wave reflection coefficient, applied in the field of oil and gas field exploration, can solve the problems of inaccurate reflection coefficient, low inversion efficiency, failure of pre-stack inversion, etc., to achieve the effect of accurate reflection coefficient and improve inversion efficiency

Inactive Publication Date: 2018-12-07
PETROCHINA CO LTD
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Problems solved by technology

However, the angle of pre-stack inversion in the prior art is too small, which can easily cause the failure of pre-stack inversion, the reflection coefficient obtained by inversion is inaccurate, and the inversion efficiency is low

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  • Reflection coefficient correction method and system
  • Reflection coefficient correction method and system
  • Reflection coefficient correction method and system

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] In view of the fact that the angle of the pre-stack inversion in the prior art is too small, it is easy to cause the failure of the pre-stack inversion, the reflection coefficient obtained by the inversion is inaccurate, and the inversion efficiency is low. The embodiment of the present invention provides a reflection coefficient correction method to Accurate reflection coefficient improves inversion efficiency. The present invention will be described i...

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Abstract

The invention provides a reflection coefficient correction method and system. The method comprises steps of according to upper interface longitudinal wave speed, lower interface longitudinal wave speed, and incidence angle, calculating an average angle; and according to the average angle, the upper interface longitudinal wave speed, the lower interface longitudinal wave speed, upper interface transverse wave speed, lower interface transverse wave speed, upper interface density and lower interface density, calculating the longitudinal reflection coefficient. Thus, the reflection coefficient canbe precise and inversion efficiency is improved.

Description

technical field [0001] The invention relates to the field of oil and gas field exploration, in particular to a reflection coefficient correction method and system. Background technique [0002] Amplitude versus offset (AVO, Amplitude versus offset) technology has become a very common method in today's oil exploration after decades of development. On the basis of AVO technology, pre-stack inversion technology has been developed, which mainly uses the relationship between amplitude and angle to invert parameters such as intercept, gradient, P-s wave velocity, density, reflection coefficient and so on from the pre-stack seismic gather. However, in the prior art, the angle of pre-stack inversion is too small, which easily leads to the failure of pre-stack inversion, the reflection coefficient obtained by inversion is inaccurate, and the inversion efficiency is low. Contents of the invention [0003] The main purpose of the embodiments of the present invention is to provide a ...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 李胜军高建虎桂金咏刘炳杨王洪求
Owner PETROCHINA CO LTD