Dongying North part deep sand Shasi low Subsegmental of gas condensate methane and ethane are lighter isotopes shows that Cracking gas oil characteristics, rather than kerogen pyrolysis gas.

• 东营北带深层沙四下凝析油气甲乙烷同位素均较轻，表现出明显的原油裂解气特征，而非干酪根裂解气。