Fracture analysis of the upper devonian antrim shale, Michigan basin
Conference
·
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
OSTI ID:7015743
- Univ. of Michigan, Ann Arbor, MI (United States)
The Antrim Shale is a fractured, unconventional gas reservoir in the northern Michigan basin. Controls on gas production are poorly constrained but must depend on the fracture framework. Analyses of fracture geometry (orientation, spacing, and aperture width) were undertaken to better evaluate reservoir permeability and, hence, pathways for fluid migration. Measurements from nearly 600 fractures were made from outcrop, core, and Formation MicroScanner logs covering three members of the Antrim Shale (Norwood, Paxton, Lachine) and the Ellsworth Shale. Fracture analyses indicate pronounced reservoir anisotropy among the members. Together related with lithologic variations, this leads to unique reservoir characteristics within each member. There are two dominant fracture sets, northeast-southwest and northwest-southeast. Fracture density varies among stratigraphic intervals but always is lowest in the northwest-southeast fracture set and is greatest in the northeast-southwest fracture set. While aperture width decreases markedly with depth, subsurface variation in mean aperture width is significant. Based on fracture density and mean aperture width, the Norwood member has the largest intrinsic permeability and the Ellsworth Shale the lowest intrinsic permeability. The highest intrinsic fracture permeability in all intervals is associated with the northeast-southwest fracture set. The Norwood and Lachine members thus exhibit the best reservoir character. This information is useful in developing exploration strategies and completion practices in the Antrim Shale gas play.
- OSTI ID:
- 7015743
- Report Number(s):
- CONF-940988--
- Conference Information:
- Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 78:8
- Country of Publication:
- United States
- Language:
- English
Similar Records
Impact of reservoir properties and fractures on gas production, antrim shale, Michigan Basin. Topical report, January 1994
Evaluation of RA tracer surveys and hydraulic fracture ID logs in the Antrim shale. Topical report, June-August 1993
Additional potential for older, Antrim Shale wells
Technical Report
·
Fri Dec 31 23:00:00 EST 1993
·
OSTI ID:6780928
Evaluation of RA tracer surveys and hydraulic fracture ID logs in the Antrim shale. Topical report, June-August 1993
Technical Report
·
Sun Oct 31 23:00:00 EST 1993
·
OSTI ID:7170533
Additional potential for older, Antrim Shale wells
Journal Article
·
Fri Sep 01 00:00:00 EDT 1995
· AAPG Bulletin
·
OSTI ID:159971