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Well section gas layer identification method and system based on pre-stack and post-stack joint inversion

An identification method and a technology for segment gas layers, which are applied in the field of oil and gas geophysical exploration and can solve the problem of low accuracy in calculating gas saturation.

Inactive Publication Date: 2021-01-22
HOHAI UNIV
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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a method and system for identifying gas layers in well intervals based on pre-stack and post-stack joint inversion to solve the problem of low accuracy in calculating gas saturation existing in the prior art. question

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  • Well section gas layer identification method and system based on pre-stack and post-stack joint inversion
  • Well section gas layer identification method and system based on pre-stack and post-stack joint inversion

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[0055] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention.

[0056] Such as figure 1 As shown, a method for identifying gas layers in well intervals based on pre-stack and post-stack joint inversion includes the following steps:

[0057] Acquiring pre-stack seismic data of the well section, the pre-stack seismic data comprising a two-dimensional seismic section;

[0058] Obtain the angle gather of the well section in the 2D seismic profile;

[0059] selecting angle wavelets from said angle gather;

[0060] Perform pre-stack seismic inversion for each angle wavelet to obtain the corresponding shear wave velocity;

[0061] matching the shear wave velocity with the logging data, and selecting the optimal angle wavelet according to the matching result;

[0062] The reflection coeffici...

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Abstract

The invention discloses a well section gas layer identification method and system based on pre-stack and post-stack joint inversion. The method comprises the steps of obtaining the pre-stack seismic data of a well section, wherein the pre-stack seismic data comprises a two-dimensional seismic profile, obtaining an angle gather of a well section in the two-dimensional seismic profile, selecting anangle wavelet from the angle gather, performing pre-stack seismic inversion on the wavelet of each angle to obtain a corresponding transverse wave speed, matching the transverse wave speed with logging data, and selecting an optimal angle wavelet according to a matching result, calculating a reflection coefficient of the well section through a Zoeppritz equation, conducting convolution on the reflection coefficient and the optimal angle wavelet to obtain a direct inversion transverse wave speed, calculating according to the direct inversion transverse wave speed and a constraint formula to obtain a longitudinal and transverse wave speed ratio, calculating the gas saturation of the two-dimensional seismic profile according to the longitudinal and transverse wave speed ratio and the gas saturation of the single well logging in the two-dimensional seismic profile, and identifying the gas layer through the gas saturation of the two-dimensional seismic section.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysical exploration, in particular to a method and system for identifying gas layers in well intervals based on pre-stack and post-stack joint inversion. Background technique [0002] Prestack seismic inversion is a kind of inversion based on convolution model. It is based on the theory that amplitude varies with offset, and can simultaneously obtain multiple elastic parameters such as P-wave velocity, S-wave velocity, and density, and can effectively identify reservoir fluid types and Structural features. Therefore, pre-stack seismic inversion is currently one of the most widely used and most mature seismic inversion techniques, and plays an important role in the exploration and development of oil and gas resources. [0003] Post-stack seismic inversion is the core link of oil and gas reservoir prediction. In the inversion process, geological, seismic and logging data are comprehensively...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/301G01V2210/512G01V2210/514
Inventor 任权张宏兵尚作萍芮剑文
Owner HOHAI UNIV
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