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Book Chapter

Gas Hydrate Offshore Vancouver Island, Northern Cascadia Margin

By
M. Riedel
M. Riedel
Department of Earth and Planetary Science, McGill University, Montreal, Quebec, Canada
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Eleanor C. Willoughby
Eleanor C. Willoughby
Department of Physics, University of Toronto, Toronto, Ontario, Canada
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Nigel Edwards
Nigel Edwards
Department of Physics, University of Toronto, Toronto, Ontario, Canada
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Roy D. Hyndman
Roy D. Hyndman
Natural Resources Canada, Geological Survey of Canada, Pacific Geoscience Center, Sidney, British Columbia, Canada
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George D. Spence
George D. Spence
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada
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Ross Chapman
Ross Chapman
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada
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Marc-Andre Chen
Marc-Andre Chen
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada
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Ivana Novosel
Ivana Novosel
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada
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Katrin Schwalenberg
Katrin Schwalenberg
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Hannover, Germany
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Published:
January 01, 2009

Abstract

This chapter reviews the extensive geophysical studies and Ocean Drilling Program (ODP) results that provide constraints on the occurrence, distribution, and concentration of deep-sea gas hydrate beneath the northern Cascadia margin offshore Vancouver Island. Most of this information comes from a wide range of seismic surveys and includes the mapping of the bottom-simulating reflector (BSR), as well as estimating gas-hydrate and free-gas concentrations. Recent additional constraints on the distribution and concentration of gas hydrate come from sea-floor-towed, controlled-source electromagnetic surveying and sea-floor compliance studies. These surveys and studies have been primarily deployed around a cold vent field, where seismic data show several broad blank zones, interpreted as fault-related conduits for focused fluid-gas migration, and where gas hydrate has been recovered in piston cores at the sea floor.

Results from the ODP Leg 146 and the recently completed Integrated Ocean Drilling Program (IODP) Expedition 311 further constrain concentration estimates for gas hydrate and free gas in the sediments along the margin and also give insight into the complex formation mechanisms and controlling factors for gas hydrate occurrence in an accretionary complex.

This summary was first presented in September 2004 at the AAPG Hedberg Research Conference on gas hydrates. Subsequently, 1 yr later, the drilling of IODP Expedition 311 resulted in a significant amount of new information and insight into the occurrence and formation processes of gas hydrate at the northern Cascadia margin. This chapter provides only a short summary of the results from that IODP Expedition. Reviews of the results from that drill coring and the downhole measurements are in progress.

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Contents

AAPG Memoir

Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards

T. Collett
T. Collett
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A. Johnson
A. Johnson
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C. Knapp
C. Knapp
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R. Boswell
R. Boswell
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American Association of Petroleum Geologists
Volume
89
ISBN electronic:
9781629810270
Publication date:
January 01, 2009

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