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Book Chapter

Primary Controls on Sequence Architecture

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Published:
December 01, 2002

Abstract

Variation in the phase relationships of precession-scale sediment yield cycles and gla-cioeustatic cycles may cause systematic differences in the marine stratigraphy of the Northern and Southern Hemispheres. These differences should be evident in the variations in lithology, and bed thickness and distribution and therefore could impact the interpretation of reservoir potential.

At precession-scale (~20 kyr), Northern and Southern Hemisphere insolation cycles are 180° out of phase. Consequently, similar climatic successions in opposite hemisphere, and associated sediment yield cycles can be 180° out of phase, as well. Prior to the Plio-Pleistocene, the common glacial condition was a unipolar icecap. Under this condition, precession-scale eustasy will tend to track the insolation cycle of the glaciated hemisphere. The result is that similar climatic successions in opposite hemispheres will have yield cycles with distinctly different phase relationships to glacioeustasy. Such differences should not exist in an ice-free world.

By taking these variations into account, stratigraphic interpretations will improve, reducing uncertainty associated with exploration analyses. Further, by determining which regions will be prone to maximum sediment yield at lowstands, the regions that are prone to the development of sand rich submarine fans could be high graded. This approach may also lead to a more complete understanding of the paleoclimate record by being able to determine whether a particular interpreted sea level shift occurred as a result of glaciation, or a more local forcing agent.

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Contents

GCSSEPM

Sequence Stratigraphic Models for Exploration and Production: Evolving Methodology, Emerging Models and Application Histories

John M. Armentrout
John M. Armentrout
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
22
ISBN electronic:
978-0-9836096-8-1
Publication date:
December 01, 2002

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