Sequence stratigraphy and facies associations of Falher units C and D, lower Cretaceous, Alberta Basin, Canada
Journal Article
·
· AAPG Bulletin
OSTI ID:421062
- McMaster University, Hamilton, Ontario (Canada)
The Lower Cretaceous Falher Member (Spirit River Formation) in the Deep Basin of Alberta is composed of 5 units (A-E) comprising the reservoir of the giant Elmworth gas field. Using high resolution sequence stratigraphy, 333 well logs and 65 cores were integrated to understand the evolution of Falher C and D in the study area. Five major faces associations were defined in each unit. The basal surface of Falher D overlies nonmarine deposits (Falher E) and is defined by a marine flooding surface (transgressive surface of erosion) partially modified by a subsequent regressive surface of erosion. Southward, all the facies become more continental and the marine flooding surface passes into a lagoon-on-nonmarine contact. Falher D contains a series of shingled marine sandstone lenses separated by erosional surfaces interpreted as seaward-dipping ravinement surfaces indicating different phases of marine transgression-regression. The Falher C basal surface is a marine flooding surface partially modified by a regressive surface of erosion. The top of Falher C is defined by a marine flooding surface representing an increase in water depth and erosional truncation during shoreface retreat. Falher C is characterized in the south by floodplain deposits and progradational shoreface sediments deposited during high- stand. A relative sea level fail produced a sequence boundary and a seaward shift of the shoreface facies northward. A sea level rise caused the shoreface migration southward (landward), forming a new transgressive surface. Progradational shoreface deposits took place during highstand and the uppermost part of Falher C was filled by aggradational floodplain deposits.
- OSTI ID:
- 421062
- Report Number(s):
- CONF-9609255--
- Journal Information:
- AAPG Bulletin, Journal Name: AAPG Bulletin Journal Issue: 8 Vol. 80; ISSN 0149-1423; ISSN AABUD2
- Country of Publication:
- United States
- Language:
- English
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