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Subaqueous Landslides as they Affect Bottom Structures

By
D. B. Prior
D. B. Prior
Coastal Studies Institutes, U. S. A.
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J. M. Coleman
J. M. Coleman
Louisiana State University;
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J. N. Suhayda
J. N. Suhayda
Civil Engineering Dept., LSU;
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L. E. Garrison
L. E. Garrison
United States Geological Survey.
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Published:
January 01, 1981

Abstract

The State and Federal lands offshore from the modern Mississippi River delta are highly productive of hydrocarbons, and there presently exist a large number of bottom-supported drilling and production platforms in water depths ranging from a few metres to several hundred metres. In addition, thousands of kilometres of pipelines connect these producing wells and production platforms to land-based processing and trunkline facilities. Since exploration began in this area, Several large plat-forms and many pipeline breaks have resulted from subaqueous sediment landslides. The major types of instabilities present have been mapped with a variety of seismic techniques. These maps, used in association with geotechnical tests, have permitted a comprehensive assessment of the mechanisms responsible for formation of the instabilities. The major types present are collapse depressions, bottleneck slides, and elongate mudslides and debris flows. The mechanisms responsible for the formation of these features are rapid sediment loading, buildup of excess pore pressures, cyclic wave loading, and localized oversteepening of the bottom. Structures and pipelines emplaced near or within a subaqueous landslide can experience loss of support, lateral displacement, or burial, depending upon the type and location of the landslide.

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AAPG Continuing Education Course Notes Series

Offshore Geologic Hazards: A Short Course Presented at Rice University, May 2-3, 1981 for the Offshore Technology Conference

Arnold Bouma
Arnold Bouma
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Dwight Sangrey
Dwight Sangrey
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James Coleman
James Coleman
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David Prior
David Prior
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Anita Trippet
Anita Trippet
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Wayne Dunlap
Wayne Dunlap
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James Hooper
James Hooper
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American Association of Petroleum Geologists
Volume
18
ISBN electronic:
9781629812618
Publication date:
January 01, 1981

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