Misconceptions, Confusion, and Pitfalls in the Application of Sequence Stratigraphy
Published:January 01, 1999
1999. "Misconceptions, Confusion, and Pitfalls in the Application of Sequence Stratigraphy", Siliciclastic Sequence Stratigraphy—Concepts and Applications, Henry W. Posarnentier, George P. Allen
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Sequence stratigraphy is a way of analyzing stratigraphic successions, and represents an approach to studying the organization of sedimentary rocks. Consequently, there is no one "stratigraphic model", but rather an infinite number of variations on the general theme. What has come to be known as sequence stratigraphy thus is a collection of "first principles", based on the interactions of four key variables: eustasy, vertical movement of the substrate (including the effects of tectonics, isostatic and flexural loading, and compaction), physiography (i.e., the shape of the land surface and the sea-floor surface, width of shelf, proximity to sediment sources, etc.), and sediment flux (a function of climate, vegetative cover, stream piracy, etc.). How these variables interact determines the evolution and stratal architecture of a basin fill. These variables also determine the nature of key bounding surfaces, as well as the stratal architecture within sequences and systems tracts.
Sequence stratigraphy, at its best, represents an integration of disciplines, as well as an integration of various types of data. As such, sequence stratigraphy does not constitute a separate entity. The sequence-stratigraphic approach should never take the place of other approaches, but should be used in conjunction with them. Consequently, sequence stratigraphy should not take the place of facies analysis, nor should it take the place of depositional-systems analyses, for example. Rather, the sequence-stratigraphic approach should complement and embrace these other analytical approaches (Posamentier and James, 1993).
A common misconception that has led to some confusion srounds the role of eustasy in determining sequence architecure
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Siliciclastic Sequence Stratigraphy—Concepts and Applications
Siliciclastic Sequence Stratigraphy-Concepts and Applications - Sequence stratigraphy has experienced a virtual explosion of applications in recent years. During that time, the concepts upon which sequence stratigraphy is based have been evolving to conform to new observations as well as new types of data. This volume summarizes the current status of this discipline as it applies to siliciclastic deposits. The emphasis in this volume is on sequence stratigraphy as an ?approach? to geological analysis, rather than as a model to which all data sets must conform. The expression of sequence architecture and the nature of bounding surfaces is illustrated through examples and applications drawn from a range of data types, including outcrop, core, wireline log, and 3-D seismic data. In addition, sequence expression also is illustrated using examples of modern landforms.