G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/28 (2006.01) G01V 3/38 (2006.01) G01V 11/00 (2006.01)
Patent
CA 2302995
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.
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Rozak Alexander Thomas
LandOfFree
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