GB2493641B - Systems and methods for evaluating formations having unknown or mixed salinity - Google Patents

Systems and methods for evaluating formations having unknown or mixed salinity

Info

Publication number
GB2493641B
GB2493641B GB201215298A GB201215298A GB2493641B GB 2493641 B GB2493641 B GB 2493641B GB 201215298 A GB201215298 A GB 201215298A GB 201215298 A GB201215298 A GB 201215298A GB 2493641 B GB2493641 B GB 2493641B
Authority
GB
United Kingdom
Prior art keywords
porosity
neutron
logging tool
measurement
formation
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 - Fee Related
Application number
GB201215298A
Other versions
GB2493641A (en
GB201215298D0 (en
Inventor
Moustafa E Oraby
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
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 Halliburton Energy Services Inc filed Critical Halliburton Energy Services Inc
Priority to GB201215298A priority Critical patent/GB2493641B/en
Publication of GB201215298D0 publication Critical patent/GB201215298D0/en
Publication of GB2493641A publication Critical patent/GB2493641A/en
Application granted granted Critical
Publication of GB2493641B publication Critical patent/GB2493641B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/08—Prospecting or detecting by the use of nuclear 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 nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
    • G01V5/104—Prospecting or detecting by the use of nuclear 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 secondary Y-rays as well as reflected or back-scattered neutrons

Abstract

Systems and methods are disclosed to provide accurate water saturation and/or formation porosity measurements in the presence of unknown or highly variable salinity levels. A logging tool assembly includes a neutron porosity tool augmented with a gamma ray detector configured to measure the rate at which hydrogen nuclei capture neutrons from a neutron source. A processing system is configured to: determine a neutron porosity based on a measurement of neutron flux at a distance from a neutron source; combine the neutron porosity with a density-based porosity estimate to obtain a formation porosity; estimate salt concentration based on the formation porosity and a ratio between said measurement of neutron flux and said measurement of the hydrogen capture rate; correct the formation porosity based on the estimated salt concentration and provide a log of the resulting salt-compensated porosity. The logging tool assembly can also include a density logging tool and a natural gamma ray logging tool to provide a salt independent triple-combo log.
GB201215298A 2008-09-30 2008-09-30 Systems and methods for evaluating formations having unknown or mixed salinity Expired - Fee Related GB2493641B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201215298A GB2493641B (en) 2008-09-30 2008-09-30 Systems and methods for evaluating formations having unknown or mixed salinity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201215298A GB2493641B (en) 2008-09-30 2008-09-30 Systems and methods for evaluating formations having unknown or mixed salinity

Publications (3)

Publication Number Publication Date
GB201215298D0 GB201215298D0 (en) 2012-10-10
GB2493641A GB2493641A (en) 2013-02-13
GB2493641B true GB2493641B (en) 2013-05-01

Family

ID=47045504

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201215298A Expired - Fee Related GB2493641B (en) 2008-09-30 2008-09-30 Systems and methods for evaluating formations having unknown or mixed salinity

Country Status (1)

Country Link
GB (1) GB2493641B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772513A (en) * 1971-03-05 1973-11-13 Texaco Inc Radioactivity oil-water well logging utilizing neutron source
US20080179510A1 (en) * 2006-06-29 2008-07-31 Baker Hughes Incorporated Use of Thorium-Uranium Ratio as an Indicator of Hydrocarbon Source Rock

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772513A (en) * 1971-03-05 1973-11-13 Texaco Inc Radioactivity oil-water well logging utilizing neutron source
US20080179510A1 (en) * 2006-06-29 2008-07-31 Baker Hughes Incorporated Use of Thorium-Uranium Ratio as an Indicator of Hydrocarbon Source Rock

Also Published As

Publication number Publication date
GB2493641A (en) 2013-02-13
GB201215298D0 (en) 2012-10-10

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20170930