CA2302995A1 - Method for measuring fracture porosity in coal seams using geophysical logs - Google Patents

Method for measuring fracture porosity in coal seams using geophysical logs Download PDF

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Publication number
CA2302995A1
CA2302995A1 CA 2302995 CA2302995A CA2302995A1 CA 2302995 A1 CA2302995 A1 CA 2302995A1 CA 2302995 CA2302995 CA 2302995 CA 2302995 A CA2302995 A CA 2302995A CA 2302995 A1 CA2302995 A1 CA 2302995A1
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Prior art keywords
fracture porosity
volume
coal
locations
methane
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CA 2302995
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French (fr)
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CA2302995C (en
Inventor
Alexander Thomas Rozak
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Priority to CA002302995A priority Critical patent/CA2302995C/en
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Expired - Fee Related legal-status Critical Current

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    • 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
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

A novel method for measuring fracture porosity in coal seams is disclosed.
Knowledge of fracture porosity is critical to methane production from coal seams as fractures form the main permeable pathways for gas migration. The disclosed invention can be used to determine likely locations where commercially significant amounts of fracturing have occurred in the coals. These locations pose prime targets for methane exploration, and the disclosed invention comprises a significant new tool in methane exploration. The disclosed invention uses existing geophysical well log data, a screening process and calculations based on the characteristics of the fluid used to drill the hole.
Using these data, the volume of invaded coal is determined, as well as the volume of drilling fluid available to create this invasion. The volume fraction of the invading drilling fluid divided by the volume of the invaded rock produces a measure of the fracture porosity of the coal. Locations that exhibit higher values of fracture porosity are more commercially attractive as methane exploration targets.
CA002302995A 2000-03-24 2000-03-24 Method for measuring fracture porosity in coal seams using geophysical logs Expired - Fee Related CA2302995C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002302995A CA2302995C (en) 2000-03-24 2000-03-24 Method for measuring fracture porosity in coal seams using geophysical logs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002302995A CA2302995C (en) 2000-03-24 2000-03-24 Method for measuring fracture porosity in coal seams using geophysical logs

Publications (2)

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CA2302995A1 true CA2302995A1 (en) 2001-09-24
CA2302995C CA2302995C (en) 2001-11-27

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CA002302995A Expired - Fee Related CA2302995C (en) 2000-03-24 2000-03-24 Method for measuring fracture porosity in coal seams using geophysical logs

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103364844B (en) * 2012-04-10 2015-11-18 中国石油天然气集团公司 A kind of method calculating coal-bed gas content
CN104181611B (en) * 2014-08-28 2016-02-24 山东科技大学 A kind of mine working face roof and floor Mining failure cranny development dynamic monitoring method
CN112392476A (en) * 2020-12-02 2021-02-23 西南石油大学 Method for determining hole permeability parameters of low-permeability fracture by using conventional logging data

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3094997B1 (en) * 2014-01-14 2020-12-16 Baker Hughes Holdings LLC A method for detecting fluid fronts using a combination of electric and gravity measurements in boreholes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103364844B (en) * 2012-04-10 2015-11-18 中国石油天然气集团公司 A kind of method calculating coal-bed gas content
CN104181611B (en) * 2014-08-28 2016-02-24 山东科技大学 A kind of mine working face roof and floor Mining failure cranny development dynamic monitoring method
CN112392476A (en) * 2020-12-02 2021-02-23 西南石油大学 Method for determining hole permeability parameters of low-permeability fracture by using conventional logging data

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Publication number Publication date
CA2302995C (en) 2001-11-27

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