Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Onshore-offshore correlations of Cretaceous fluvial-deltaic sequences, southern Baltimore Canyon Trough

William J. Schmelz, Kenneth G. Miller, Gregory S. Mountain, James V. Browning and Kimberly E. Baldwin
Onshore-offshore correlations of Cretaceous fluvial-deltaic sequences, southern Baltimore Canyon Trough
AAPG Bulletin (February 2020) 104 (2): 411-448

Abstract

We evaluate Cretaceous depositional sequences on approximately 4400 km ( approximately 2700 mi) of newly released multichannel seismic profiles and five wells on the continental shelf in the southern Baltimore Canyon trough and tie the data to three wells drilled onshore in the Maryland coastal plain. Seismic geometries coupled with facies and biostratigraphy from the wells are used to delineate mid-Cretaceous (Aptian-Turonian) depositional sequences and paleogeography. Beneath these sequences, 400-1000 m (1300-3300 ft) of Lower Cretaceous sedimentary rocks underlie the modern shelf. They thicken along strike to the southwest, implying a southern sediment source. Aptian to Cenomanian sediments were deposited in shelf to nearshore settings. A landward movement of the depocenter and a shift toward facies indicative of deeper paleodepths marks a 10 (super 7) -yr mid-Cretaceous transgression, within which we identify five sequences. A composite maximum flooding surface (MFS) within the uppermost of these retrogradational units is associated with the Cenomanian-Turonian boundary and ocean anoxic event 2. Shingled, lower Turonian seismic reflections prograde across the outer shelf, downlapping onto the composite MFS, and are truncated by a mid-Turonian sequence boundary. The Upper Cretaceous section thickens seaward and along strike to the northeast, implying a northern source and little Late Cretaceous accommodation beneath the modern shelf. Mid-Cretaceous strata offshore Maryland are likely sand-prone, considering their proximity to the correlative fluvial facies of the onshore Potomac Group. These potential reservoir sands are capped by regional confining units generated by 10 (super 7) -yr global mean sea-level flooding events and are excellent targets for supercritical carbon storage.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 104
Serial Issue: 2
Title: Onshore-offshore correlations of Cretaceous fluvial-deltaic sequences, southern Baltimore Canyon Trough
Affiliation: Rutgers University, Department of Earth and Planetary Sciences, Piscataway, NJ, United States
Pages: 411-448
Published: 20200215
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 104
Accession Number: 2020-028734
Categories: Applied geophysicsEconomic geology, geology of energy sourcesStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, sects., strat. cols., 3 tables, sketch maps
N37°00'00" - N40°19'60", W76°00'00" - W72°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 202009
Close Modal

or Create an Account

Close Modal
Close Modal