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Book Chapter

The Sequence as a Tool for Stratigraphic Analysis

Published:
January 01, 1990

Abstract

Application of sequence-stratigraphic analysis depends on the recognition of a hierarchy of stratal units including beds, bed sets, parasequences, parasequence sets, and sequences bounded by chronostratigraphically significant surfaces of erosion, nondeposition, or their correlative surfaces. This method of stratigraphic analysis contrasts with the use of transgressive and regressive cycles of strata for regional correlation of time and facies.

Transgressive and regressive cycles have been used for regional correlation for at least 50 years (Grabau,1932;Krumbein and Sloss, 1963). Recently, proponents of transgressive and regressive cycles, referred to as T-R units, for regional correlation have included Ryer(1983), Busch and Rollins (1984), Busch et al. (1985),and Galloway (1989a). Galloway (1989a) introduced the "genetic stratigraphic sequence," which is a regressive depositional unit bounded by transgressive surfaces. Although he did not define it specifically, he described it as "a package of sediments recording a significant episode of basin-margin outbuilding and basin filling, bounded by periods of Widespread basinmargin flooding."

The genetic stratigraphic sequence is based on Frazier's (1974) concept of depositional episodes patterned after late Quaternary "sequences" deposited during high-frequency "episodes" controlled by glacial cycles. The depositional episodes are bounded by "hiatuses" or flooding surfaces formed during sea level rise or by shifting delta lobes. Galloway (1989b)applied Frazier's (1974) concept to much larger Cenozoic units of the Gulf of Mexico basin, recognizing about 14 major continental-margin outbuilding episodes, each of which culminated in a major flooding event. Although Frazier's (1974) depositional episodes have frequencies comparable to fourth-order sequences, Galloway's (1989b) units average 4 to 5m.y.

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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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