Gas hydrate occurs as a kind of sediment cement in the first model,and is mainly distributed in volcanic ash,tuffaceous mud and turbidities with shallow depths,high porosity and low gas hydrate saturation.

• 第1种模式的水合物以胶结物的形式存在,主要分布在火山灰、凝灰质泥和浊流层中,埋深通常较小,孔隙度较高,水合物饱和度较低,沿地层层面分布;