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A two-step avf-based method for extracting P- and S-wave seismic quality factors

A quality factor and extraction method technology, applied in seismic signal processing and other directions, can solve the problems of lack of shear wave quality factor information, lack of work area information, and accuracy constraints of traditional methods, and achieve high precision, rich information, and uniform distribution.

Active Publication Date: 2017-06-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This has great limitations. First of all, the traditional method can only obtain the quality factor data beside the well, and lacks the information of the entire work area.
Secondly, the traditional method only focuses on the quality factor of the longitudinal wave, and lacks important information on the quality factor of the shear wave.
Finally, there are many factors that affect the energy of seismic wave propagation, and it is impossible to distinguish which part of the energy loss is caused by the absorption of the formation itself, so the accuracy of traditional methods will also be restricted

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  • A two-step avf-based method for extracting P- and S-wave seismic quality factors
  • A two-step avf-based method for extracting P- and S-wave seismic quality factors
  • A two-step avf-based method for extracting P- and S-wave seismic quality factors

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0026] The invention extracts the seismic quality factor by performing AVO inversion and AVF inversion on the frequency-divided seismic data according to the variation rule of seismic reflection coefficient with frequency (Amplitude Variation with Frequency, AVF).

[0027] The present invention is based on the velocity-dispersion relation

[0028]

[0029] Above, where v is the dispersion velocity, ω is the circular frequency (this value is the frequency parameter, which is known after frequency division), ω r is the reference circle frequency (this is a given quantity, generally the main frequency of the data), v 0 is the speed when the frequency is the frequency of the reference circle, Q is the quality factor, and i is the imaginary unit. figure 1 The viscoelastic reflection coefficient model in is the relationship between velocity, frequency and quality facto...

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Abstract

The invention provides a longitudinal and transverse wave earthquake quality factor extraction method based on two-step method AVF (amplitude variation with frequency) and belongs to the field of seismic data pre-stack inversion. The method comprises steps as follows: (1) inputting pre-stack seismic data, that is, different-angle stack data after offset; (2) performing frequency division on the different-angle stack data to form frequency-divided data bodies; (3) performing AVO (amplitude variation with offset) inversion on the different frequency-divided data bodies acquired in Step (2) respectively to acquire longitudinal wave speeds, transverse wave speeds and densities under different frequency; (4) performing AVF inversion on the longitudinal wave speeds and the transverse wave speeds, which are acquired in Step (3), under the different frequency respectively to obtain quality factors of a longitudinal wave and a transverse wave.

Description

technical field [0001] The invention belongs to the field of pre-stack inversion of seismic data, and in particular relates to a method for extracting longitudinal and shear seismic quality factors based on a two-step AVF method. Background technique [0002] The subsurface medium in which seismic waves propagate is not completely elastic. When seismic waves propagate in it, attenuation occurs, and the degree of attenuation varies with the frequency of seismic waves. The intensity of seismic wave absorption and attenuation is an intrinsic property of the medium, which reflects the properties of rock elasticity and plasticity. Therefore, if the absorption and attenuation rate of seismic waves is studied, the information of rock and pore fluid can be effectively distinguished. At present, the mainstream methods for extracting quality factor (also known as attenuation factor) are spectral ratio method and centroid frequency shift method of VSP data. In 1981, Hauge proposed the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 陈蕾
Owner CHINA PETROLEUM & CHEM CORP
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