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Pre-stack seismic inversion method of longitudinal and transverse wave attenuation parameters depending on frequency

A technology of attenuation parameters and pre-stack earthquakes, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of extracting seismic dispersion and attenuation anomalies, without considering seismic wave velocity dispersion and energy attenuation effects, etc.

Active Publication Date: 2021-08-06
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional AVO technology only considers the variation of the seismic reflection amplitude with the incident angle, and does not consider the velocity dispersion and energy attenuation effects caused by the propagation of seismic waves in the subsurface fluid-containing medium. Anomaly of Seismic Dispersion and Attenuation Caused by Laminar Fluid

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  • Pre-stack seismic inversion method of longitudinal and transverse wave attenuation parameters depending on frequency
  • Pre-stack seismic inversion method of longitudinal and transverse wave attenuation parameters depending on frequency
  • Pre-stack seismic inversion method of longitudinal and transverse wave attenuation parameters depending on frequency

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Embodiment Construction

[0025] (1) Input the pre-stack seismic angle gather data volume S(t, θ) of the target work area, S(t, θ) contains 300 pre-stack seismic angle gathers (use s i (t, θ) means), the angle range of each pre-stack seismic angle gather is 3°~36°, and the angle interval is 3°, so each pre-stack seismic angle gather contains n=12 seismic traces with different angles, The pre-stack seismic angle gather has 400 sampling points, and the time sampling interval is 0.002 seconds. The post-stack seismic section corresponding to these 300 pre-stack seismic angle gathers (including 300 post-stack seismic traces) is as follows figure 1 shown;

[0026] (2) Input the well logging P-wave velocity V p (t) and shear wave velocity V s (t), input reference stratigraphic level data;

[0027] (3) For the pre-stack seismic angle gather s with sequence number i i (t, θ), use the high-precision time-frequency analysis method to calculate the time-frequency amplitude spectrum of the seismic trace at eac...

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Abstract

The invention provides a method for inverting frequency-dependent longitudinal and transverse wave attenuation parameter attributes by using pre-stack seismic angle gather data. The method comprises the following steps of: firstly, establishing an optimized fitting mapping relational expression of frequency-dependent seismic longitudinal and transverse wave quality factors and frequency-dependent longitudinal and transverse wave attenuation parameters; constructing an algorithm for calculating frequency-dependent longitudinal and transverse wave attenuation parameters from actual pre-stack seismic angle gather data. The frequency-dependent longitudinal and transverse wave attenuation parameters obtained based on the method can be used for reliably distinguishing different underground fluid reservoirs, accurately detecting spatial distribution of oil and gas reservoirs and providing important basis for subsequent reservoir development and well location deployment.

Description

technical field [0001] The present invention relates to the field of data processing and information extraction of oil and gas seismic exploration, in particular to a method for inverting frequency-dependent longitudinal and shear wave attenuation parameter attributes using pre-stack seismic angle gather data, so as to utilize frequency-dependent longitudinal and shear waves It provides an important basis for reliably distinguishing different underground fluid reservoirs and accurately detecting the spatial distribution of oil and gas reservoirs. Background technique [0002] Ostrander (1984) proposed a technology to identify "spotlight" type gas-bearing sandstones by using the variation of seismic wave reflection coefficient with incident angle (AVO, Amplitude Versus Offset) feature. This technology opens the door to the application of pre-stack seismic data to predict oil and gas. Compared with post-stack seismic data, although the signal-to-noise ratio of pre-stack seism...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 陈学华徐斌张杰吕丙南刘俊杰黎康毅
Owner CHENGDU UNIVERSITY OF TECHNOLOGY