Gas hydrates on continental margins of the United States based on occurrence of bottom simulating reflectors on marine seismic records
Technical Report
·
OSTI ID:5741671
- comp.
Natural-gas hydrates are solid, ice-like mixtures of natural gas (mainly methane) and water that are found in continental margin sediments at depths of water greater than about 500 m. The presence of gas hydrates in continental margins is commonly inferred from marine seismic surveys. The base of the gas-hydrate zone often correlates with an anomalous acoustic reflector which approximately parallels the sea floor and is often called a bottom simulating reflector (BSR). The sediment depths at which this reflector occurs can be predicted based on considerations of the pressure-temperature stability field for gas hydrates and the geothermal gradient. The reflector probably results from the velocity contrast between the sediment cemented with gas hydrate and the underlying sediment where lower velocities occur because of the absence of gas hydrate and the possible presence of free gas. This map shows locations on the continental margins of the United States where seismic records indicate the presence of gas hydrates. The compilation includes only information from published or known ''in press'' sources as of 1983. 7 refs.
- Research Organization:
- Geological Survey, Denver, CO (USA)
- DOE Contract Number:
- AI21-83MC20422
- OSTI ID:
- 5741671
- Report Number(s):
- USGS/OFR/MAP-83-822; ON: DE85008231
- Country of Publication:
- United States
- Language:
- English
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