CA2179271A1 - Efficient processing of nmr echo trains - Google Patents

Efficient processing of nmr echo trains

Info

Publication number
CA2179271A1
CA2179271A1 CA002179271A CA2179271A CA2179271A1 CA 2179271 A1 CA2179271 A1 CA 2179271A1 CA 002179271 A CA002179271 A CA 002179271A CA 2179271 A CA2179271 A CA 2179271A CA 2179271 A1 CA2179271 A1 CA 2179271A1
Authority
CA
Canada
Prior art keywords
echo trains
nmr echo
approximation
efficient processing
svd
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002179271A
Other languages
French (fr)
Other versions
CA2179271C (en
Inventor
Manfred G. Prammer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Halliburton Energy Services Inc
Original Assignee
Manfred G. Prammer
Numar Corporation
Halliburton Energy Services, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Manfred G. Prammer, Numar Corporation, Halliburton Energy Services, Inc. filed Critical Manfred G. Prammer
Publication of CA2179271A1 publication Critical patent/CA2179271A1/en
Application granted granted Critical
Publication of CA2179271C publication Critical patent/CA2179271C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/46—NMR spectroscopy
    • G01R33/4625—Processing of acquired signals, e.g. elimination of phase errors, baseline fitting, chemometric analysis

Abstract

A method and apparatus (28) is disclosed for efficient processing of NMR
echo trains (fig.3) in well logging. A priori information about the nature of the expected signals is used to obtain an approximation of the signal using a set ofpre-selected basis functions (fig.5). A singular decomposition (SVD) is applied to a matrix incorporating information about the basis functions and is stored off-line a memory. During the actual measurement, the apparatus estimates a parameter related to the SNR of the received NMR echo trains and uses it to determine a signal approximation model in conjunction with the SVD of the basis function matrix. This approximation is used to determine in real time attributes (fig. 8) of the earth formation being investigated.
CA002179271A 1993-12-16 1994-12-07 Efficient processing of nmr echo trains Expired - Lifetime CA2179271C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US168,600 1993-12-16
US08/168,600 US5517115A (en) 1993-12-16 1993-12-16 Efficient processing of NMR echo trains
PCT/US1994/014054 WO1995016927A1 (en) 1993-12-16 1994-12-07 Efficient processing of nmr echo trains

Publications (2)

Publication Number Publication Date
CA2179271A1 true CA2179271A1 (en) 1995-06-22
CA2179271C CA2179271C (en) 2004-04-13

Family

ID=22612157

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002179271A Expired - Lifetime CA2179271C (en) 1993-12-16 1994-12-07 Efficient processing of nmr echo trains

Country Status (6)

Country Link
US (1) US5517115A (en)
EP (1) EP0734535A4 (en)
AU (1) AU1398795A (en)
CA (1) CA2179271C (en)
NO (1) NO315958B1 (en)
WO (1) WO1995016927A1 (en)

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Also Published As

Publication number Publication date
NO962533D0 (en) 1996-06-14
NO962533L (en) 1996-08-12
US5517115A (en) 1996-05-14
WO1995016927A1 (en) 1995-06-22
NO315958B1 (en) 2003-11-17
EP0734535A1 (en) 1996-10-02
CA2179271C (en) 2004-04-13
AU1398795A (en) 1995-07-03
EP0734535A4 (en) 1997-06-04

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