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Time-frequency decomposition earthquake-fluid recognition method

A fluid identification and time-frequency decomposition technology, applied in the field of petroleum exploration, can solve the problems of inaccurate oil and gas prediction, and achieve the effect of stable low-frequency information, significant effect, and improved signal-to-noise ratio.

Inactive Publication Date: 2013-08-07
CHINA UNIV OF PETROLEUM (BEIJING) +1
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Problems solved by technology

[0015] In order to solve the problem of inaccurate prediction of oil and gas in the prior art, the embodiment of the present invention provides a time-frequency decomposition seismic fluid identification method, which can accurately predict the distribution range and spatial distribution of gas reservoirs, and optimize the favorable targets for natural gas exploration Provide technical support

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[0037] The following description will enable any person skilled in the art to utilize the present invention. The descriptions provided in the specific embodiments and applications are examples only. Various extensions and combinations of the embodiments described herein will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention . Thus, the present invention is not limited to the embodiments shown, but the present invention covers the widest scope consistent with the principles and features shown herein.

[0038] The detailed description below is presented in the form of flow diagrams, logical modules and other symbolic manipulation representations that can be executed on a computer system. A program, computer-implemented step, logic block, procedure, etc., is conceived herein to be a self-consistent sequence of one or more steps or inst...

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Abstract

The invention relates to the technical field of petroleum exploration, in particular to a time-frequency decomposition earthquake-fluid recognition method which includes establishing a time-frequency atom dictionary D according to Morlet wavelet function m(t)=exp[-betaXf2(t-tau)2]exp[i(2pif(t-tau)+phi)], and acquiring an initial matching atom of the Morlet wavelet function through calculation with a seismic trace and complex seismic trace method; performing matching decomposition on the seismic trace, performing iterative optimization with constraints of the time-frequency atom dictionary D in the neighborhood of the initial matching atom to acquire an optimal matching atom, stopping matching decomposition when preset conditions are achieved, and representing the initial seismic trace as a series of linear combinations of Morlet wavelet atoms; transforming the optimal matching Morlet atom into the time-frequency domain so as to acquire a time-frequency spectrum distribution of the initial seismic trace; extracting directly properties of earthquake fluid activity on a target stratum section on the time-frequency spectrum of earthquake materials; and predicting distribution range and space distribution of gas deposit according to the properties of the fluid activity. By the method, the distribution range and the space distribution of the gas deposit can be accurately predicted, so that a technical support is provided for favorable target optimization of natural gas exploration.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular, the invention relates to a time-frequency decomposition seismic fluid identification method. Background technique [0002] With the continuous deepening of oil and gas exploration work, increasing difficulty and increasing scarcity of structural traps, it is becoming more and more urgent to search for hidden oil and gas purposefully. More subtle complex oil and gas reservoirs dominated by lithological traps and other types. [0003] In the past 30 years, seismic inversion and AVO analysis techniques have become the core technologies of reservoir prediction and fluid identification. The singleness of post-stack seismic wave impedance inversion parameters makes it difficult to effectively judge the nature of the fluid in the reservoir. The AVO analysis and pre-stack multi-parameter inversion technology based on the variation of reflection amplitude with offset to pred...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 黄捍东董月霞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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