Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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

A technology of nuclear magnetic resonance, determination method, applied in the direction of detection by electron magnetic resonance/nuclear magnetic resonance, electrical/magnetic detection for logging records, etc.

Active Publication Date: 2006-11-29
PETROCHINA CO LTD +1
View PDF0 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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 schematic diagram of the flow chart for determining the T2 cut-off value by the morphological method is as follows: Figure 24 Shown:

[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 singl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01V3/32
Inventor 匡立春毛志强孙中春王劲
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com