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Pre-stack seismic data retrieval method and system

A pre-stack seismic and data technology, applied in the inversion method and system of pre-stack seismic data, in the field of pre-stack inversion, can solve the problem of limited effective bandwidth of seismic data, inability to widen the frequency band of seismic data, low accuracy of inversion results, etc. problem, to achieve the effect of improving stability

Active Publication Date: 2013-09-11
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, limited by seismic acquisition technology and noise pollution, the effective bandwidth of seismic data is limited, and low-frequency and high-frequency components are often erroneous information. The traditional time-domain linear AVO inversion cannot broaden the frequency band of the original seismic data. The results are also less accurate

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  • Pre-stack seismic data retrieval method and system
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  • Pre-stack seismic data retrieval method and system

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Embodiment approach 1

[0069] Step S105 in Embodiment 1 specifically includes:

[0070] S205: Establish an inversion matrix equation of the angle gather reflection coefficient according to the convolution model. The angle gather reflection coefficient in formula (7) satisfies:

[0071] r ( t , θ ) ≈ a ( t , θ ) Δρ ( t ) ρ ( t ) + b ( t , θ ) Δ V P ( t ) V ...

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Abstract

The invention provides a pre-stack seismic data retrieval method and system. The pre-stack seismic data retrieval method includes: acquiring pre-stack seismic data of the current stratum; selecting an advantageous frequency band range from the pre-stack seismic data; extracting angle gather seismic data and seismic wavelets from the advantageous frequency band range; determining angle gather reflection coefficient according to a convolution model, the angle gather seismic data and the seismic wavelets; determining hyper-parameters according to relevant vector machines and the angle gather reflection coefficient; determining a super-resolution sparse pulse reflection coefficient according to the hyper-parameters, the angle gather reflection coefficient and the Bayes criterion; comprehensively analyzing the super-resolution sparse pulse reflection coefficient to obtain layer distribution of the current stratum. By the pre-stack seismic data retrieval method and system, resolution and accuracy of retrieval results are improved, and accuracy in identifying stratum relation and property of the thin layer and the thin-interbed lithologic oil-gas reservoir is improved.

Description

technical field [0001] The present invention relates to the technical field of petroleum geophysical exploration, in particular to the pre-stack inversion technology in petroleum geophysical exploration, specifically a method and system for inversion of pre-stack seismic data. Background technique [0002] In the field of seismic exploration technology, the change of amplitude versus offset (Amplitude Versus Offset, AVO) is often used in the inversion of the reflection coefficient of the formation three parameters (p-wave velocity, shear-wave velocity and density), and then obtain the Basic lithological information such as compressional wave velocity, shear wave velocity and density. [0003] The linear AVO inversion method based on the least squares method in the prior art is mainly based on the approximate relationship between the longitudinal wave reflection coefficient and the three-parameter reflection coefficient, combined with the convolution model, and is established...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 袁三一王静波骆春妹王尚旭
Owner BC P INC CHINA NAT PETROLEUM CORP
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