Geomorphology and High-Resolution Stratigraphy of Progradational Wave-Dominated Shoreline Deposits: Impact on Reservoir-Scale Facies Architecture
Published:January 01, 2008
Gary J. Hampson, Antonio B. Rodriguez, Joep E.A. Storms, Howard D. Johnson, Craig T. Meyer, 2008. "Geomorphology and High-Resolution Stratigraphy of Progradational Wave-Dominated Shoreline Deposits: Impact on Reservoir-Scale Facies Architecture", Recent Advances in Models of Siliciclastic Shallow-Marine Stratigraphy, Gray J. Hampson, Ronald J. Steel, Peter M. Burgess, Robert W. Dalrymple
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Modern and ancient progradational shoreface-shelf deposits contain a complex physical stratigraphy that is below parasequence scale. This stratigraphy is interpreted to reflect a threefold hierarchy of geomorphic elements: (1) beach ridges, approximating to units bounded by minor facies-discontinuity surfaces, (2) beach-ridge sets, bounded by surfaces across which there is a distinct offset in shoreline trajectory, and (3) progradational wave-dominated shoreline systems, which correspond to parasequences and are bounded by flooding surfaces. All three geomorphic elements and their bounding surfaces are readily reproduced in simple process-response numerical models. A synthesis of modern and ancient datasets and numerical-modeling experiments indicates that the three geomorphic elements and associated stratigraphy can be produced by a number of mechanisms, including changes in wave climate, temporal and spatial variations in sediment supply, and relative sea-level fluctuations.
Models of high-resolution, intra-parasequence stratigraphy can be used to guide correlations in subsurface wireline-log and core datasets, thus improving the definition of reservoir facies architecture and rock-property distributions. The key to robust application of these models is the consistent identification of subtle, high-order stratigraphic surfaces, and their subsequent correlation as shoreface-shelf clinoforms. Data from the Rannoch Formation, Brent Field, U.K. North Sea, are used to illustrate the application of such models, which provide a mechanism to explain anomalous fluid distributions and drainage patterns in the reservoir.
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Recent Advances in Models of Siliciclastic Shallow-Marine Stratigraphy
Siliciclastic shallow-marine deposits record the interface between land and sea, and its response to a variety of forcing mechanisms: physical process regime, the internal dynamics of coastal and shelfal depositional systems, relative sea level, sediment flux, tectonic setting, and climate. These deposits have long been the subject of conceptual stratigraphic models that seek to explain the interplay between these various forcing mechanisms, and their preservation in the stratigraphic record. This volume arose from an SEPM research conference on shoreline–shelf stratigraphy that was held in Grand Junction, Colorado, on August 24–28, 2004. The aim of the resulting volume is to highlight the development over the last 15 years of the stratigraphic concepts and models that are used to interpret siliciclastic marginal-marine, shallow-marine, and shelf deposits.