^pof;
Geo-resources;
and;
Information,;
China;
University;
of;
Petroleum,;
Dongying,;
Shandong;
257061,;
China;
^pExploration;
and;
Development;
Institute,;
PetroChina,;
Beijing;
100083,;
China;
天然气分布; 成因类型; 浅埋; 中新生代盆地; 浅层气藏; 沉积盆地; 地球化学特征; 迁移距离;