Upper Jurassic and Lower Cretaceous sedimentary sequence, Baltimore Canyon trough, US Atlantic margin

Conference · Sat Dec 01 04:00:00 EST 1984 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5550954

Libby-French, J

The extent and character of Upper Jurassic and Lower Cretaceous rock units in the Baltimore Canyon Trough are revealed by geologic data from 29 exploratory wells. These data, released to the public in 1982, have been used previously to define regional rock-stratigraphic units. In this study, four detailed stratigraphic cross sections were constructed to show rock-unit correlations based on lithology and electric logs. Thin-section photomicrographs document the mineralogic composition of these units. Most of the Upper Jurassic section consists primarily of Mic Mac gray shale and siltstone with minor amounts of very fine to medium-grained quartzarenite, red-brown shale, and lignite. This interval also contains some anomalously thick sandstones and siltstones, which are generally limited to the north and have been tentatively assigned to the Mohawk unit. These sandstones are mostly medium to coarse-grained, calcite-cemented quartzarenites. Upper Jurassic Abenaki limestone as much as 2210 ft (675 m) thick was penetrated by most of the eastern wells. The limestone is mostly wackestone to grainstone, with varying amounts of oolites and fossils. Thick-bedded sandstones characterize the Lower Cretaceous Mississauga unit. These sandstones are mostly fine to medium-grained, calcite-cemented quartzarenites. The overlying Naskapi unit consists of calcareous shale. Thick sandstone beds dominate the uppermost Logan Canyon unit, which consists mostly of fine to coarse-grained, calcite-cemented quartz arenite.

• Research Organization: Geological Survey, Denver, CO
• OSTI ID: 5550954
• Report Number(s): CONF-8410269-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 68:12
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
ATLANTIC OCEAN
BALTIMORE CANYON
CRETACEOUS PERIOD
DRILLING
ENERGY SOURCES
EXPLORATION
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGY
JURASSIC PERIOD
LITHOLOGY
MESOZOIC ERA
PETROLEUM
ROCKS
SEAS
SEDIMENTARY ROCKS
STRATIGRAPHY
SURFACE WATERS
WELL DRILLING