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Method for determining nuclear magnetic resonance logging T2 spectral T2 end value

A technology of nuclear magnetic resonance and determination methods, which is applied in the fields of electron magnetic resonance/nuclear magnetic resonance detection, electrical/magnetic detection for well logging records, etc.

Active Publication Date: 2007-11-14
PETROCHINA CO LTD +1
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  • Abstract
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Problems solved by technology

Provide a reliable method and technology to determine the T2 cut-off value of nuclear magnetic resonance logging, and overcome the technical limitations of the current method

Method used

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  • Method for determining nuclear magnetic resonance logging T2 spectral T2 end value
  • Method for determining nuclear magnetic resonance logging T2 spectral T2 end value
  • Method for determining nuclear magnetic resonance logging T2 spectral T2 end value

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Embodiment Construction

[0087] Through our years of research, on the basis of a large number of experimental data and measured data, a method to determine the T2 cut-off value based on the morphological characteristics of the NMR T2 spectrum is proposed, which is called the morphological method for short. The flowchart of the determination of the T2 cut-off value by the morphological method is shown in Figure 24:

[0088] The first step is to classify the T2 spectrum of NMR logging according to the morphological characteristics.

[0089] Due to the large difference in the characteristics of the core saturation spectrum and centrifugal spectrum of different pore structures, after comparative analysis, the T2 saturation spectrum is divided into the following three categories and five sub-categories, respectively: a. Bimodal type (also divided into bimodal macroporous type and bimodal small hole type); b. Unimodal type (also divided into single peak large hole type and single peak small hole type); c. Tri...

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Abstract

The invention relates to a method for determining T2cutoff value by nuclear magnetic resonance logging (NMRL) T2 spectra, comprising the steps of: 1. classifying NMRL T2 spectra by shape characteristics; 2. fitting and obtaining centrifugal spectrum according to different types of logging T2 spectra; 3. making area integration on the centrifugal spectrum and obtaining area of centrifugal spectrum; 4. calculating areas of logging T2 spectra; 5. accumulating the areas of logging T2 spectra, and as the accumulated area is equal to or closest to the area of centrifugal spectrum, the corresponding T2 value is a T2cutoff value. Thus, the invention determines T2cutoff value of each depth point by directly using NMRL T2 spectra.

Description

technical field [0001] The invention relates to a method for determining the T2 cut-off value of the NMR logging T2 spectrum, in particular to a method for determining the T2 cut-off value of the logging T2 spectrum at each sampling point by using morphological feature classification for the NMR logging T2 spectrum Methods. technical background [0002] The original data of NMR logging is a spin-echo string decaying with time. The spin-echo string contains rich information such as reservoir physical properties, pore type, pore size, fluid type and its distribution. A spin-echo train can be represented as a superposition of multiple decay indices: [0003] Echo ( t ) = Σ i = 1 N φ i exp ( - t / T ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/32
Inventor 匡立春毛志强孙中春王劲
Owner PETROCHINA CO LTD
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