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TitleCyclicity in the Egret Member (Kimmeridgian) oil source rock, Jeanne d'Arc Basin, offshore eastern Canada
AuthorHuang, Z; Williamson, M A; Bateman, J; McAlpine, K D; Fowler, M G
SourceMarine and Petroleum Geology vol 13, no 1, 1996 p. 91-105,
Alt SeriesGeological Survey of Canada, Contribution Series 46294
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region
AreaJeanne d'Arc Basin
Lat/Long WENS -49.5000 -47.0000 47.5000 46.0000
Subjectsfossil fuels; stratigraphy; Nature and Environment; sea level changes; climate; lithology; petrophysics; organic deposits; lithostratigraphy; depositional cycles; Kimmeridgian; Egret Member; climate change; total organic carbon; Jurassic; Mesozoic
Illustrationssketch maps; gamma ray logs; stratigraphic correlations
AbstractThe origin of the observed variability in lithology, total organic carbon and petrophysical properties of the Egret Member (source rock interval) in the Jeanne d'Arc Basin, offshore eastern Canada is examined. Detailed analyses of petrophysical logs indicate that the Egret Member is cyclic. Three different orders of cycles, recognizable on well logs, occur in the Egret Member. The large- and medium-scale cycles are correlatable among wells. The estimated cyclicities of the large- and medium-scale cycles fall into the Milankovitch-like cycle bands, suggesting that the depositional cycles are the product of orbitally forced sea-level and climatic changes and implying that Egret Member deposition lasted at least 1.65 million years. Using chronological information drawn from sedimentary cycles, both spatial and vertical (temporal) variations in sedimentation rate are examined for the member. A correlation exists between low sedimentation rates and high total organic carbon values in this basin. It is most probable that the organic-rich layers were deposited during times of high sea-level stands and warmer periods.