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Book Chapter

Sequence Stratigraphy and the Hierarchy of Stratal Units

Published:
January 01, 1990

Abstract

As already discussed, stratal units from the laminato the sequence can be grouped into a hierarchy. Recognition of these stratal units and their use in correlating time and facies is the essence of sequences tratigraphy. The following discussion builds upward from the smallest unit in the hierarchy, the lamina, to the largest unit considered in this book, the sequence.

Each stratal unit in the hierarchy is defined and identified only by the physical relationships of the strata, including lateral continuity and geometry of the surfaces bounding the units, vertical-stacking patterns, and lateral geometry of the strata within the units. In addition, facies and environmental interpretations of strata on either side of bounding surfaces are critical, especially for parasequence, parasequence set, and sequence-boundary identification. Thickness, time for formation, and interpretation of regional or global ongm are not used to define stratal units or to place them in the hierarchy. In particular, parasequencesand sequences can be identified in well logs, cores, or outcrops and used to construct a stratigraphic framework regardless of their interpreted relationship to changes in eustasy.

Documentation of parasequences, parasequencesets, and sequences in this book is primarily from Tertiary strata in the northern Gulf of Mexico and Cretaceous strata of the basins in the western interior of the United States. Examples are exclusively of siliciclastic rocks; however, many of the concepts documented by these examples can also be applied to carbonate strata (Sarg, 1988).

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Contents

AAPG Methods in Exploration

Siliciclastic Sequence Stratigraphy in Well Logs, Cores, and Outcrops: Concepts for High-Resolution Correlation of Time and Facies

J. C. Van Wagoner
J. C. Van Wagoner
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R. M. Mitchum
R. M. Mitchum
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K. M. Campion
K. M. Campion
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V. D. Rahmanian
V. D. Rahmanian
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American Association of Petroleum Geologists
Volume
7
ISBN electronic:
9781629810164
Publication date:
January 01, 1990

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