Inversion method and device of two-dimensional nuclear magnetic resonance spectrum based on TwIST

A nuclear magnetic resonance spectrum and nuclear magnetic resonance technology, applied in the field of oil and gas reservoir exploration, can solve the problems of slow speed and low convergence speed of two-dimensional nuclear magnetic resonance spectrum

Active Publication Date: 2018-05-15
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] The present invention provides a TwIST-based inversion method and device for two-dimensional nuclear magnetic resonance spectrum, which is used to solve the problem that the speed of algorithm convergence is low, and then the speed of obtaining two-dimensional nuclear magnetic resonance spectrum is slow

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  • Inversion method and device of two-dimensional nuclear magnetic resonance spectrum based on TwIST
  • Inversion method and device of two-dimensional nuclear magnetic resonance spectrum based on TwIST
  • Inversion method and device of two-dimensional nuclear magnetic resonance spectrum based on TwIST

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[0035] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

[0036] The specific application scenarios of the present invention are as follows. NMR logging can be used to detect reservoir rock information, and NMR logging collects echo data; then, it is necessary to invert the echo data to obtain the relaxation spectrum reflecting formation fluid information. One-dimensional nuclear magnetic resonance spectrum is commonly used at present, for e...

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Abstract

The invention provides an inversion method and a device of two-dimensional nuclear magnetic resonance spectrum based on TwIST. The method includes the steps that through N groups of nuclear magnetic resonance measured parameters, a nuclear matrix is generated, and a target function used for inversion of the two-dimensional nuclear magnetic resonance spectrum is established; when a regularization parameter is evaluated each time, a TwIST algorithm is adopted to find the solution to the target function; according to each solution to the target function, a data ratio corresponding to each solution is determined; according to each data ratio and evaluation of the regularization parameter each time, a curvilinear relationship is established; a slope corresponding to the evaluation of the regularization parameter each time in the curvilinear relationship is calculated, and according to the slope, an optimal evaluation of the regularization parameter is determined; the solution of the targetfunction corresponding to the optimal evaluation is determined, and according to the solution of the target function corresponding to the optimal evaluation, he two-dimensional nuclear magnetic resonance spectrum is generated. In the process of algorithm iteration, the results of the previous two iterations are used to improve the calculation precision, and speed up the convergence of the algorithm.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir exploration, in particular to a TwIST-based two-dimensional nuclear magnetic resonance spectrum inversion method and device. Background technique [0002] With the development of oil and gas reservoir exploration and development technology, nuclear magnetic resonance logging can be used to detect reservoir rock information. For example, nuclear magnetic resonance logging can be used to directly detect the hydrogen nucleus information of the fluid in the reservoir rock pores. NMR logging can obtain echo data; then the echo data needs to be inverted to obtain a two-dimensional NMR spectrum reflecting formation fluid information, which is also called relaxation spectrum, and echo data is also called NMR resonance data. [0003] In the prior art, when inverting echo data to obtain a two-dimensional nuclear magnetic resonance spectrum, an L1 regularization method may be used. The L1 re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16G06F19/00
CPCG06F17/16G16Z99/00
Inventor 谢然红郭江峰金国文高伦
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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