Controls on passive margin stratigraphy: Seismostratigraphic and basin modeling evaluation of Georges Bank basin

Conference · Fri Mar 01 04:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7259667

Shuster, M W; Lawrence, D T ^[1]

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1. Shell Development Co., Houston, TX (United States)

Seismostratigraphic interpretations constrained by well data were coupled with 2-D stratigraphic forward and thermo-subsidence models to predict stratigraphy and to better understand the roles of tectonics, eustasy, and sedimentation in controlling sequence development in the Georges Bank basin. Seventeen late Middle Jurassic-Cretaceous depositional sequences and 13 types of seismically defined depositional facies were recognized and correlated within the basin. Subsidence histories constrained by seismic correlations, a modified Exxon sea-level curve, and iteratively determined sediment infill parameters were the primary input for 2-D stratigraphic modeling analyses of three dip oriented seismic lines. The sea-level curve was the same as that used in earlier modeling studies of Baltimore Canyon. The integrated seismostratigraphic interpretations and stratigraphic modeling results predict similar aggradational Jurassic-Cretaceous mixed clastic/carbonate platforms. The extent and rate of shelf margin progradation can be attributed to focused infilling associated with an embayment or possible salt or basement tectonism. Relative sea-level changes controlled gross reciprocal clastic/carbonate depositional patterns. A series of time sequential cutaway block diagrams and facies maps will be shown illustrating the computer-modeled and seismically interpreted Jurassic-Cretaceous sequence stratigraphic evolution of the basin. The Georges Bank stratigraphic evolution will be compared to that of Baltimore Canyon. Even though the two basins had differing subsidence and sedimentation histories, the observed facies distribution and stratal geometries could be simulated with a single sea-level curve.

• OSTI ID: 7259667
• Report Number(s): CONF-910403--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ATLANTIC OCEAN
BALTIMORE CANYON
CRETACEOUS PERIOD
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEOLOGY
GEOMETRY
GEOPHYSICAL SURVEYS
GEORGES BANK
JURASSIC PERIOD
LEVELS
MATHEMATICS
MESOZOIC ERA
SEA LEVEL
SEAS
SEDIMENTARY BASINS
SEISMIC SURVEYS
STRATIGRAPHY
SURFACE WATERS
SURVEYS
TECTONICS
TWO-DIMENSIONAL CALCULATIONS