...is enormous, but estimates of the amounts are speculative and range over three 1 orders-of-magnitude from about 100,000 to 270,000,000 trillion cubic feet...have been mapped at depths ranging from about 0 to 1 , 1 00 m below the sea floor. Gas hydrates have been recovered by scientific drilling along the Atlantic,...

...estimates of the amounts are speculative ana range over three orders-of-magnitude from about lOO.OOp to 270,000,000 trillion cubic feet of gas. Despite...been mapped at depths ranging from about 0 to 1,100 in below the sea floor. Gas hydrates nave been recovered by scientific drilling along the Atlantic,...

...geologic controls on their distribution. The presence of gas hydrates in onshore continental margins have been inferred mainly from anomalous seismic reflectors that coincide with the base of the gas hydrate stability zone. This reflector, commonly called the "bottom simulator reflector" or "BSR"...

...the outer portion of the Mackenzie River Delta (Dallimore et al., l999). The presence of gas hydrate in offshore continental margins has been inferred mainly from anomalous seismic reflectors (ie, BSRs) that coincide with the predicted phase boundary at the base of the gas-hydrate stability...