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A Method of Attenuation Qualitative Analysis Based on Sparse Spectral Decomposition

A qualitative analysis, sparse spectrum technology, applied in seismology, instruments, measurement devices, etc., can solve the problems of low time-frequency resolution, not high enough time resolution, not suitable for oil and gas reservoirs with various thicknesses, etc.

Active Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] (1) The traditional linear time-frequency analysis method is limited by the Heisenberg uncertainty principle, which results in a low time-frequency resolution and cannot accurately locate oil and gas reservoirs
[0006] (2) Although time-frequency analysis methods based on sparse representation can improve the resolution of time-frequency methods, the time resolution of these time-frequency methods is not high enough, so they are not suitable for oil and gas reservoirs with various thicknesses

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[0048] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0049] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a method for qualitative analysis of attenuation based on sparse spectral decomposition. Firstly, a spectral decomposition model based on sparse Group-Lasso penalty function is proposed, and then an iterative segmentation algorithm is used to solve the coefficients of the sparse spectral decomposition method. Finally, Based on this spectral decomposition method, the difference between high and low frequencies is calculated, so as to qualitatively calculate the attenuation of the seismic section. Through the comparison of synthetic data and actual data, the sparse spectrum decomposition method proposed by the present invention has higher time resolution and can more accurately identify the position of oil and gas reservoirs.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a method for qualitative analysis of attenuation of post-stack seismic data, in particular to a method for qualitative analysis of attenuation based on sparse spectrum decomposition. Background technique [0002] After the seismic wave passes through the gas-bearing reservoir, the high-frequency component attenuates relatively quickly, while the low-frequency component attenuates relatively slowly, which will cause the local dominant frequency of the seismic wave in this area to decrease. The low-frequency shadow under this amplitude anomaly is often used to Indicates the location of oil and gas reservoirs. However, the anomaly is not obvious in the original seismic data, but the anomaly can be clearly found in the frequency slice obtained by the time-frequency analysis method. Therefore, time-frequency analysis methods are often used to detect these amplitude anomalie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/301G01V1/306G01V2210/514G01V2210/624
Inventor 高静怀杨阳王治国李振
Owner XI AN JIAOTONG UNIV