GB1500350A - Three frequency modulated combination thermal neutron lifetime log and porosity log - Google Patents

Three frequency modulated combination thermal neutron lifetime log and porosity log

Info

Publication number
GB1500350A
GB1500350A GB1179776A GB1179776A GB1500350A GB 1500350 A GB1500350 A GB 1500350A GB 1179776 A GB1179776 A GB 1179776A GB 1179776 A GB1179776 A GB 1179776A GB 1500350 A GB1500350 A GB 1500350A
Authority
GB
United Kingdom
Prior art keywords
neutron
log
porosity
thermal
frequency modulated
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.)
Expired
Application number
GB1179776A
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.)
Texaco Development Corp
Original Assignee
Texaco Development Corp
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
Priority claimed from US05/576,539 external-priority patent/US3979300A/en
Application filed by Texaco Development Corp filed Critical Texaco Development Corp
Publication of GB1500350A publication Critical patent/GB1500350A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
    • G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
    • G01V5/101—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
    • G01V5/102—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole the neutron source being of the pulsed type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
    • G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
    • G01V5/107—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons
    • G01V5/108—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons the neutron source being of the pulsed type

Landscapes

  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

1500350 Neutron well-logging TEXACO DEVELOPMENT CORP 24 March 1976 [12 May 1975] 11797/76 Addition to 1499427 Heading G1A The disclosure is substantially identical to that of British application 1499427 with the added feature that at least two thermal-neutron or gammaray detectors are positioned at different distances from the fast neutron source longitudinally of the borehole. The ratio between the thermal-neutron populations measured by these spaced detectors is used to determine the fast-neutron slowing-down length in the earth formations and hence to derive an indication of the porosity of the formations, in addition to their thermal-neutron decay constant.
GB1179776A 1975-05-12 1976-03-24 Three frequency modulated combination thermal neutron lifetime log and porosity log Expired GB1500350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/576,539 US3979300A (en) 1974-07-17 1975-05-12 Three frequency modulated combination thermal neutron lifetime log and porosity

Publications (1)

Publication Number Publication Date
GB1500350A true GB1500350A (en) 1978-02-08

Family

ID=24304852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1179776A Expired GB1500350A (en) 1975-05-12 1976-03-24 Three frequency modulated combination thermal neutron lifetime log and porosity log

Country Status (4)

Country Link
AU (1) AU497744B2 (en)
CA (1) CA1051561A (en)
FR (1) FR2311323A2 (en)
GB (1) GB1500350A (en)

Also Published As

Publication number Publication date
FR2311323A2 (en) 1976-12-10
FR2311323B2 (en) 1979-09-28
CA1051561A (en) 1979-03-27
AU1383076A (en) 1977-11-17
AU497744B2 (en) 1979-01-04

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Legal Events

Date Code Title Description
PS Patent sealed