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Nuclear magnetic resonance echo data inversion method and device based on L0 regularization

A technology of nuclear magnetic resonance and echo data, which is applied in earthwork drilling, complex mathematical operations, boreholes/well components, etc., and can solve problems such as inaccurate inversion spectrum of nuclear magnetic resonance echo data

Active Publication Date: 2018-05-08
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] In order to solve the technical problem of inaccurate inversion spectrum of NMR echo data based on L0 regularization in the prior art, the present invention provides a method and device for inversion of NMR echo data based on L0 regularization

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  • Nuclear magnetic resonance echo data inversion method and device based on L0 regularization
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  • Nuclear magnetic resonance echo data inversion method and device based on L0 regularization

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[0081] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the embodiments of the present invention. It should be noted that in the drawings or the specification, similar or identical elements all use the same reference signs.

[0082] figure 1 It is a flowchart of a method for inversion of NMR echo data based on L0 regularization according to an exemplary embodiment of the present invention, such as figure 1 As shown, the method of this embodiment includes:

[0083] Step 101: Determine the nuclear matrix according to the nuclear magnetic resonance measurement parameters.

[0084] Step 102: Construct the objective function according to the kernel matrix and taking the L0 norm as the penalty term of the objective function.

[0085] Step 103: Determine the optimal solution of the objective...

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Abstract

The invention provides a nuclear magnetic resonance echo data inversion method and device based on L0 regularization. According to the method, a nuclear matrix is determined according to nuclear magnetic resonance measurement parameters; an objective function is constructed according to the nuclear matrix by using L0 norms as penalty items of the objective function; an optimal solution of the objective function is determined based on an iteration algorithm; and a nuclear magnetic resonance spectrum of nuclear magnetic resonance echo data inversion is determined according to the optimal solution based on relaxation information. Compared with a traditional nuclear magnetic resonance echo data inversion method, through the inversion method, the L0 norms are used to perform penalty on an inversion result, the effect of a short relaxation component inversion spectrum is improved, the iteration solving process is simple, the robustness of the algorithm is good, and a stable inversion resultcan be obtained under the condition of nuclear magnetic resonance data with different signal-to-noise ratios.

Description

Technical field [0001] The invention relates to a nuclear magnetic resonance logging data processing technology in oil and gas exploration, in particular to a nuclear magnetic resonance echo data inversion method and device based on L0 regularization. Background technique [0002] Nuclear magnetic resonance logging is a new logging technology that reflects the reservoir characteristics of the formation by measuring the relaxation characteristics of hydrogen nuclei in the formation fluid. NMR logging technology can be effectively applied to the calculation of reservoir physical parameters and the identification of reservoir fluid properties. It has obvious advantages in identifying low resistivity, low porosity and low permeability oil and gas layers, and evaluating reservoir pore structure. [0003] The original echo data measured by nuclear magnetic resonance logging needs to be inverted to obtain the nuclear magnetic resonance relaxation spectrum reflecting the formation fluid in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16E21B49/00
CPCE21B49/00G06F17/16
Inventor 谢然红郭江峰刘秘金国文高伦
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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