Multi-frequency multi-dimensional nuclear magnetic logging method and device

A nuclear magnetic logging, multi-dimensional technology, which is applied in the direction of electronic magnetic resonance/NMR detection, electrical/magnetic detection and measurement for logging records, etc., can solve the problem of poor effect, polarization time, echo interval Problems such as single distribution area

Pending Publication Date: 2020-11-24
CHINA OILFIELD SERVICES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, most of the related multi-dimensional nuclear magnetic logging models are designed according to foreign multi-dimensional logging models,

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  • Multi-frequency multi-dimensional nuclear magnetic logging method and device
  • Multi-frequency multi-dimensional nuclear magnetic logging method and device
  • Multi-frequency multi-dimensional nuclear magnetic logging method and device

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Embodiment Construction

[0039] The application describes a number of embodiments, but the description is illustrative rather than restrictive, and it will be obvious to those of ordinary skill in the art that within the scope of the embodiments described in the application, There are many more embodiments and implementations. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.

[0040] This application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of this application can also be combined with any conventional features or elements to form unique inventive solutions as defined by the clai...

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Abstract

The embodiment of the invention discloses a multi-frequency multi-dimensional nuclear magnetic logging method and device. The method comprises the steps of employing a plurality of different frequencies for working when an underground nuclear magnetic logging instrument works, wherein the plurality of different frequencies are different frequencies of which the frequency number is greater than two; respectively acquiring echoes corresponding to a plurality of different frequencies in a plurality of different acquisition time periods; collecting echoes corresponding to one frequency in one collection time period; when the echoes corresponding to any one frequency are collected, enabling the frequencies except the current echo collection frequency in the multiple different frequencies to bein a polarization waiting state; and calculating a predetermined spectrogram according to the acquired echoes of the plurality of frequencies, wherein the predetermined spectrogram comprises one or more of the following spectrograms: a D-T2 spectrogram, a T1-T2 spectrogram and a T1/T2-T2 spectrogram. Through the scheme of the embodiment, the acquisition period is shortened, sufficient polarizationis ensured, and the inversion effects of T1-T2, T1/T2-T2 and D-T2 are improved.

Description

technical field [0001] This paper relates to well logging technology, especially a multi-frequency and multi-dimensional NMR logging method and device. Background technique [0002] The multi-dimensional nuclear magnetic logging technology is compatible with all the advantages of the one-dimensional nuclear magnetic logging technology, and can analyze T1-T2, T1 / T2-T2, D-T2 and D-T1 spectra at the same time. The analysis of these spectra can accurately obtain the lateral Relaxation time T2, longitudinal relaxation time T1 and diffusion coefficient D. Based on multi-dimensional nuclear magnetic spectrum, it can carry out auxiliary fluid identification, reservoir classification, particle size analysis, etc. [0003] However, most of the related multi-dimensional nuclear magnetic logging models are designed according to foreign multi-dimensional logging models, and the distribution area of ​​polarization time and echo interval is relatively single, and the inversion of T1-T2, T...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B47/13G01V3/32
CPCE21B47/00G01V3/32Y02A90/30
Inventor 姜志敏党煜蒲薛志波张嘉伟陈向新张向林李仙枝
Owner CHINA OILFIELD SERVICES
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