National/Regional Estimates of the Amount of Gas within Hydrates
(cubic feet)
United States
317,700 x 1012 Collett 1995
India
4,307 x 1012 ONGC 1997
Blake Ridge, USA
635 x 1012 Dillion & others 1993
2,471 x 1012 Dickens & others 1997
2,824 x 1012 Holbrook & others 1996*
2,012 x 1012 Collett 2000*
1,331 x 1012 Collett 2000
Nankai Trough, Japan
1,765 x 1012 MITI/JNOC 1998
Andaman Sea, India
4,307 x 1012 ONGC 1997
North Slope, Alaska
590 x 1012 Collett 1997
* includes associated free-gas