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 PDFInfo
- 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
- Authority
- CA
- Canada
- Prior art keywords
- fracture porosity
- volume
- coal
- locations
- methane
- 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
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
- 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
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.
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.
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)
Publication Number | Publication Date |
---|---|
CA2302995A1 true CA2302995A1 (en) | 2001-09-24 |
CA2302995C CA2302995C (en) | 2001-11-27 |
Family
ID=4165711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002302995A Expired - Fee Related CA2302995C (en) | 2000-03-24 | 2000-03-24 | Method for measuring fracture porosity in coal seams using geophysical logs |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2302995C (en) |
Cited By (3)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015108433A1 (en) * | 2014-01-14 | 2015-07-23 | Baker Hughes Incorporated | A method for detecting fluid fronts using a combination of electric and gravity measurements in boreholes |
-
2000
- 2000-03-24 CA CA002302995A patent/CA2302995C/en not_active Expired - Fee Related
Cited By (3)
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 |
Also Published As
Publication number | Publication date |
---|---|
CA2302995C (en) | 2001-11-27 |
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Legal Events
Date | Code | Title | Description |
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EEER | Examination request | ||
MKLA | Lapsed |