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Method for using travel-time variation quantity to extract anisotropism parameters

An anisotropy and parameter extraction technology, applied in the field of geological exploration, can solve problems such as less analysis and research on the influencing factors and differences of anisotropy parameters, poor stability and non-uniqueness, and difficult seismic data extraction and inversion.

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

It can be seen that most of these studies focus on the calculation and inversion methods of travel time, and there are few studies on the influence factors and differences of anisotropy parameters on travel time.
[0003] Due to the small value of the anisotropy parameters of the formation (relative to the formation velocity) and their correlation, the extraction and inversion of anisotropy parameters using seismic data has always been a relatively difficult subject, and there are problems such as poor stability and non-uniqueness

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  • Method for using travel-time variation quantity to extract anisotropism parameters
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  • Method for using travel-time variation quantity to extract anisotropism parameters

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0055] like Figure 4 Shown, content of the present invention is as follows:

[0056] (1) Technical principle

[0057] For a transversely isotropic medium with a uniform horizontal reflection interface, the expression of the P-wave travel time t is obtained according to the geometric relationship of the ray path:

[0058] ( φ ) 2 z V g ( φ ) cos φ - - - ( 1 )

[0059] V g (φ) is the qP wave group emitted at the ray angle φ (qP wave, also known as quasi-P wave, refers to the P wave in the anisotropic medium. Because in the anisotropic medium, the phase normal and polarizatio...

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Abstract

The invention provides an analysis of influence factors for P wave travel time by anisotropism parameters, and belongs to the field of geological exploration. The method includes the steps of: (1) analyzing geological data of a local region; (2) determining causes of formation and types of anisotropism; (3) determining sensitive anisotropism parameters; (5) obtaining the anisotropism parameters through inversion; and (5) performing migration processing on anisotropism. According to the method provided by the invention, when anisotropism parameter inversion is performed, firstly the causes of formation of anisotropism of the local region are acquainted, the type of anisotropism are analyzed, and the sensitive parameters are selected for inversion, so that the precision of anisotropism imaging that is obtained is obviously better than isotropy imaging.

Description

technical field [0001] The invention belongs to the field of geological prospecting, and in particular relates to a method for extracting anisotropic parameters by utilizing travel time variation. Background technique [0002] The anisotropy of underground rocks exists objectively. For transversely isotropic media, Thomsen proposed anisotropy parameters ε, δ, and γ with clear physical meaning, and gave the phase velocity and transit velocity based on these parameters respectively The expression under the condition of arbitrary strength and weak anisotropy laid the foundation for the study of anisotropy; after that, Tasvankin and Thomsen proposed the analysis of the reflection time-distance curve of long array and arbitrary strength anisotropic medium with higher precision expression, and on this basis, the inversion of anisotropic parameters using ground reflection data was studied; Zhang et al. gave a clear analytical expression for the group velocity in TI medium; Alkha li...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 周巍郭全仕王鹏燕
Owner CHINA PETROLEUM & CHEM CORP
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