云南景谷盆地晚第三纪介形类古生态与油气的关系

OSTRACODA ASSEMBLAGE IN NEOGENE IN JINGGU BASIN,YUNNAN PROVINCE AND ITS RELATION TO THE OIL AND GAS GENERATION

通过景谷盆地晚第三纪三个介形类组合特征分析,说明生物所具有的继承性,又因环境的变化出现不同的种属类型,壳面的装饰和保存状况也发生了变化。景谷盆地晚第三纪中新世中期生物繁盛,有机质丰富,为油气生成提供了物质基础,同时有利的水介质条件和快速的沉积,为有机质的保存和转化成烃类提供了外界条件。

Based on Ostracoda fossils collected from Neogene in Jinggu Basin, Yunnan Province, three Ostracod assemblage zones are established, as follows:1. Potamcoypris-Candoniella Assemblage zone; (Early Miocene)2. Herpetocypris-Metacyplis Assemblage Zone; (Middle-late Miocene)3. Leucocythere-llyocypris Assemblage Zone; (Pliocene)According to the abundance of Ostracoda with preservad state of their shell, the authorgives a discussion about the relation between the organic matter abundance and depositionalspeed as well as the Ostracoda and Gas and Oil generated in Jinggu Basin。