NMR echo data inversion method and device

A technology of echo data and nuclear magnetic resonance, which is applied in the field of logging data processing in oil and gas exploration, can solve problems such as poor inversion results and achieve good inversion results

Active Publication Date: 2019-03-01
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] The present invention provides a method and device for inversion of nuclear magnetic resonance echo data to overcome the problem of poor inversion results for nuclear magnetic resonance echo data with low signal-to-noise ratio in the prior art

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  • NMR echo data inversion method and device
  • NMR echo data inversion method and device
  • NMR echo data inversion method and device

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Embodiment Construction

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments 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 creative efforts fall within the protection scope of the present invention.

[0051] The method of the embodiment of the present invention can be applied to nuclear magnetic resonance logging. The formation parameters and information such as porosity, irreducible water, permeability, pore size distribution, and fluid type for formation evaluation can be obtained through inversion by collecting the original NMR echo data.

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Abstract

The invention provides a method and a device for inversing nuclear magnetic resonance echo data. The method for inversing the nuclear magnetic resonance echo data includes acquiring the nuclear magnetic resonance echo data; constructing residual bound terms according to mixed l<1> / l<2> norms and establishing objective functions according to the residual bound terms; acquiring the optimal regularization parameters of regularization terms in the objective functions; inversing the nuclear magnetic resonance echo data according to the regularization parameters and the objective functions and acquiring inversion results of the nuclear magnetic resonance echo data. The method and the device have the advantage that the excellent reversion results can be obtained under the condition of low signal-to-noise ratios of the nuclear magnetic resonance echo data.

Description

technical field [0001] The invention relates to the technical field of well logging data processing in oil and gas exploration, in particular to a nuclear magnetic resonance echo data inversion method and device. Background technique [0002] For the inversion of NMR echo data, there are many inversion methods, which can be divided into two types: linear inversion method and nonlinear inversion method. Linear inversion methods are mainly truncated singular value decomposition (TSVD) and Tikhonov regularization methods; nonlinear inversion methods include Monte Carlo method and maximum entropy method. [0003] For NMR echo data with low signal-to-noise ratio, the objective function of the above inversion method usually includes a residual constraint term and a regularization term. Residual constraints usually use l 2 The norm measures the error between the fitted and measured values, however, according to l 2 The solution obtained by the norm is more sensitive to data outl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10G06F17/15G06F17/16
CPCG06F17/10G06F17/15G06F17/16
Inventor 谢然红邹友龙金国文郭江峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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