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.
CN100349013CActive Publication Date: 2007-11-14PETROCHINA CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2007-11-14

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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.
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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 ...

Claims

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