Book contents
- Frontmatter
- Contents
- Preface
- Acknowledgements
- Note on the accompanying website
- List of maps on the accompanying website
- List of contributed presentations on the accompanying website
- 1 Introduction to seabed fluid flow
- 2 Pockmarks, shallow gas, and seeps: an initial appraisal
- 3 Seabed fluid flow around the world
- 4 The contexts of seabed fluid flow
- 5 The nature and origins of flowing fluids
- 6 Shallow gas and gas hydrates
- 7 Migration and seabed features
- 8 Seabed fluid flow and biology
- 9 Seabed fluid flow and mineral precipitation
- 10 Impacts on the hydrosphere and atmosphere
- 11 Implications for man
- References
- Index
6 - Shallow gas and gas hydrates
Published online by Cambridge University Press: 14 October 2009
- Frontmatter
- Contents
- Preface
- Acknowledgements
- Note on the accompanying website
- List of maps on the accompanying website
- List of contributed presentations on the accompanying website
- 1 Introduction to seabed fluid flow
- 2 Pockmarks, shallow gas, and seeps: an initial appraisal
- 3 Seabed fluid flow around the world
- 4 The contexts of seabed fluid flow
- 5 The nature and origins of flowing fluids
- 6 Shallow gas and gas hydrates
- 7 Migration and seabed features
- 8 Seabed fluid flow and biology
- 9 Seabed fluid flow and mineral precipitation
- 10 Impacts on the hydrosphere and atmosphere
- 11 Implications for man
- References
- Index
Summary
The importance of gas in transmitting, marking and altering sediments and of its traces as clues to depositional, paleo-ecological and diagenetic history is not generally appreciated.
Cloud, 1960Gas generated beneath the seabed is buoyant, and tends to migrate towards the surface. Geological conditions may impede its progress, so shallow gas accumulations are formed. The exact nature of these accumulations depends on the type of sediment they are held in. Also, in certain pressure and temperature conditions, migrating gas may be sequestered by the formation of gas hydrates. Evidence is provided by various forms of acoustic signal recorded on seismic profiles, and is supported by the results of drilling, as well as the occurrence of natural gas seeps at the seabed.
Gas beneath the seabed is not a geological curiosity, but is common-place and widespread.
- Type
- Chapter
- Information
- Seabed Fluid FlowThe Impact on Geology, Biology and the Marine Environment, pp. 163 - 188Publisher: Cambridge University PressPrint publication year: 2007
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