Title:
LSQR-RSVD-BASED FAST INVERSION ALGORITHM FOR TWO-DIMENSIONAL NUCLEAR MAGNETIC RESONANCE
Document Type and Number:
WIPO Patent Application WO/2020/224012
Kind Code:
A1
Abstract:
An LSQR-RSVD-based fast inversion algorithm for two-dimensional nuclear magnetic resonance, comprising: designing and generating a forward model suitable for two-dimensional nuclear magnetic inversion; setting a certain number of iterations to invert the forward model using LSQR; setting a number of dimensions of a sub-matrix of a RSVD algorithm, and using an output of LSQR as an input of the RSVD algorithm for inversion; and calculating inversion time, occupied memory and relative errors and generating a two-dimensional spectrum. The method uses the calculation result of non-negative least squares (LSQR) as an initial value of the RSVD inversion, and may significantly reduce memory requirements and speed up the inversion speed when performing two-dimensional nuclear magnetic inversion. Moreover, the method may guarantee inversion accuracy, effectively reduce the calculation time and hardware costs, and has a reasonable design and good effects.
Inventors:
LI HAITAO (CN)
HU XUFEI (CN)
DENG SHAOGUI (CN)
ZHANG FENGJIAO (CN)
HAN JUNAN (CN)
YUAN XIYONG (CN)
HU XUFEI (CN)
DENG SHAOGUI (CN)
ZHANG FENGJIAO (CN)
HAN JUNAN (CN)
YUAN XIYONG (CN)
Application Number:
PCT/CN2019/088485
Publication Date:
November 12, 2020
Filing Date:
May 27, 2019
Export Citation:
Assignee:
CHINA UNIV OF PETROLEUM HUADONG (CN)
International Classes:
G01R33/56
Foreign References:
| CN110147520A | 2019-08-20 | |||
| CN104375108A | 2015-02-25 | |||
| CN108038082A | 2018-05-15 | |||
| CN103984033A | 2014-08-13 | |||
| US20130325408A1 | 2013-12-05 |
Other References:
TAN, M.J. ET AL.: "A new inversion method for (T2, D) 2D NMR logging and fluid typing", COMPUTERS & GEOSCIENCES, vol. 51, 6 August 2013 (2013-08-06), pages 366 - 380, XP055210704, DOI: 10.1016/j.cageo.2012.07.030
HU, X.F. ET AL.: "A novel efficient inversion method for three-dimensional NMR and the optimization of activation sequences and acquisition parameters", COMPUTATIONAL GEOSCIENCES, vol. 22, 22 February 2018 (2018-02-22), pages 867 - 883, XP036508710, DOI: 10.1007/s10596-018-9730-z
HU, X.F. ET AL.: "A novel efficient inversion method for three-dimensional NMR and the optimization of activation sequences and acquisition parameters", COMPUTATIONAL GEOSCIENCES, vol. 22, 22 February 2018 (2018-02-22), pages 867 - 883, XP036508710, DOI: 10.1007/s10596-018-9730-z
Attorney, Agent or Firm:
QINGDAO ZHIDILINGCHUANG PATENT AGENCY CO.,LTD (CN)
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