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A Method of Elastic Parameter Inversion

An elastic parameter and inversion technology, applied in seismology for logging records, etc., can solve problems such as lack of large-angle information, and achieve high inversion coincidence rate, stable inversion results, and high efficiency

Active Publication Date: 2020-11-17
福瑞升(成都)科技有限公司
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Problems solved by technology

Pre-stack AVO inversion relies heavily on the quality of pre-stack gathers, especially large-angle (above 30 degrees) information, but most current gathers lack effective large-angle information

Method used

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  • A Method of Elastic Parameter Inversion
  • A Method of Elastic Parameter Inversion
  • A Method of Elastic Parameter Inversion

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Embodiment Construction

[0043] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0044] refer to figure 1 , the present invention provides an elastic parameter inversion method:

[0045] An elastic parameter inversion method, comprising:

[0046] S1. Extract seismic attribute volumes related to elastic parameters through pre-stack AVO attribute analysis.

[0047] The extraction of the seismic attribute body includes:

[0048] S11. Simplify the Zoplitz equation.

[0049] S12. Using the simplified Zoplitz equation to calculate the intercept, gradient and curvature.

[0050] S13. Using the intercept, gradien...

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Abstract

The invention discloses an elastic parameter inversion method. The method comprises the steps of extracting a seismic attribute body related to an elastic parameter through pre-stack AVO attribute analysis; calculating well logging elastic parameters by utilizing known well drilling and logging data; performing synthetic record calibration, and establishing a relationship between the logging elasticity parameter and the seismic attribute body; and establishing a variation function according to a relative change relationship between the waveform change characteristic of the seismic attribute body and the logging curve of the logging elastic parameter, and performing well-seismic combination simulation inversion to obtain the elastic parameter. According to the inversion method, dependence on large-angle information of the pre-stack gather is avoided, and an inversion result is more stable; in addition, the inversion method does not depend on wavelets and models, efficiency is high, andthe result is more reliable.

Description

technical field [0001] The invention relates to an elastic parameter inversion method. Background technique [0002] The current elastic parameter inversion methods are basically based on the pre-stack AVO inversion method, that is, the technology in which the seismic wave reflection amplitude changes with the distance (offset) between the shot point and the receiving point. The offset here can be directly understood as the angle of incidence, which is performed using angle gathers in practice. Prestack AVO inversion relies heavily on the quality of prestack gathers, especially large-angle (above 30°) information, but most current gathers lack effective large-angle information. In addition, the inversion of velocity, density and other elastic parameters is a process of error accumulation, and the inversion error gradually increases. Therefore, an inversion method with high inversion accuracy that does not rely too much on the wide-angle data of the gather is needed. Conte...

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Application Information

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IPC IPC(8): G01V1/40
CPCG01V1/40
Inventor 李建海
Owner 福瑞升(成都)科技有限公司
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