Hydrates of Natural Gas: A Review of Their Geologic Occurrence
GEOLOGICAL SURVEY CIRCULAR 825
Hydrates of Natural Gas: A Review of Their Geologic Occurrence
Hydrates of Natural Gas: A Review of Their Geologic Occurrence
By Keith A. Kvenvolden and Mark A. McMenamin
GEOLOGICAL
SURVEY CIRCULAR
825
1980
United States Department of the Interior
CECIL D. ANDRUS, Secretary
Geological Survey
H. William Menard, Director
Free on application to Branch of Distribution, U.S. Geological Survey, 1200 South Eads Street, Arlington, VA 22202
CONTENTS
Page
Summary ---------------------------------------------------------------- 1 Introduction ----------------------------------------------------------- 2 Gas hydrates in permafrost regions ------------------------------------- 2 Gas hydrates in oceanic sediments -------------------------------------- 4
Bottom-simulating reflectors -------------------------------------- ~ Other seismic evidence for gas hydrates in oceanic sediments ------ 7 Selected bibliography -------------------------------------------------- 8
ILLUSTRATIONS
Figure 1. 2. 3. 4. 5.
Page Phase boundary diagram showing free methane gas and methane
hydrate --------------------------------------------------2 Map showing location of known and inferred occurrences of gas
hydrates in permafrost regions and in oceanic sediment ---3 Graph of gas hydrate zone shown as intersection of geothermal
gradient with hydrate-gas phase boundary -----------------4 Diagram showing idealized section of methane gas hydrate zone
in sediments of outer continental margins ----------------5 Diagrammatic seismic profile of Blake-Bahama Outer Ridge
showing bottom-simulating reflector ----------------------6
TABLES
Table 1. 2.
Page
Geologic, geophysical, and geochemical evidence for gas hydrates beneath permafrost ---------------------------------3
Geologic, geophysical, and geochemical evidence for gas hydrates in the seafloor ------------------------------------5
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