The oil gas produced fr om Tertiary sandstone is divided into three fractions: natural gas, light hydroc arbon and condensate.

• 将其所产烃类分为天然气、轻烃、凝析油3个段份进行的地球化学研究表明:天然气和轻烃具“腐殖高熟”特征,凝析油具“腐泥低熟”特征。