Table 1 Comparison of formation properties between the Qilian Mountain and Mackenzie Delta gas hydrates.

Gas component

CH₄

CH₄, C₂H₆, C₃H₈, C₄H₁₀, CO₂

Structure type

sI

sII

Stratum

Oligocene (Kugmallit, Mackenzie Bay)

Middle Jurassic (Jiangcang)

Reservoir lithology

Sandstone

Oily shale, siltstone, fine sandstone

Permafrost

Arctic

Mountain

Permafrost thickness

640 m

95 m

Burial depth

>1000 m

133~396 m