准噶尔芦草沟组与黄山街组的古气候条件

准噶尔中二叠统芦草沟组无论是从岩性还是所含古生物，均表明形成于持续炎热的气候条件之下，当时由于准噶尔古板块与塔里木古板块的拼合造山，造成准噶尔周缘火山强烈喷发和自欧洲东移的干旱炎热气流对准噶尔均有明显的影响。上三叠统黄山街组形成时干旱气候缓解，降水量增加，该组沉积物反映出温暖的亚热带气候特征。因此，从成油的古气候条件来说，芦草沟组要优于黄山街组。

PALEOCLIMATIC CONDITIONS OF LOUCAOGOU AND HUANGSHANJIE FORMATIONS IN JUNGGAR

Lithology and paleontology of Loucaogou Formation of Middle Permian in Junggar indicate a consistent arid climate. The accretion-orogeny of Junggar plate and Tarim plate resulted in intense volcanic eruption at surroundings of Junggar. The eastward migration of arid and hot currents from Europe also has a big influence on the climate of Junggar. Huangshanjie Formation of Upper Triassic reflects a temperate sub-tropical climate with increasing precipitation. Loucaogou Formation of Middle Permian, especially the upper member, indicates a lacustrine stagnant oxygen-lack environment. The high temperature at lake surface is favorable for the accumulation of organic material. Huangshanjie Formation of Upper Triassic consists of lacustrine basinal sediments, with relatively sufficient supply of clastics from surroundings and weak reduction. The reduction is higher at the lake center. Its paleo-temperature is relatively lower than that of Loucaogou Formation. The sedimentary environment and paleoclimatic conditions of Loucaogou Formation have a more favorable condition for oil generation than Huangshanjie Formation.