中文摘要：

在区域热演化史和埋藏史基础上，通过对准噶尔盆地南缘霍-玛-吐构造带白垩系东沟组-古近系紫泥泉子组砂岩储层流体包裹体样品的系统分析，确定各期次油气成藏的主要时间，并对古近系紫泥泉子组在油气成藏期中的古流体势演化和油气运聚特征进行研究。结果表明：研究区主要经历了两期油气成藏，第一期主要在中新世中一晚期（距今约14-9Ma），第二期主要在上新世中一晚期（距今约3．7-2．5Ma）；两期油气成藏的古流体势分布格局具有显著差异，第一期在吐谷鲁背斜区的古流体势最低，以聚集白垩系烃源岩生成的油为主，第二期在玛纳斯背斜区的古流体势演变为最低，以聚集中下侏罗统煤系烃源岩生成的气为主。

英文摘要：

Based on the reconstruction of burial history, thermal history and the analysis of fluid inclusion samples collected from the K2d-El_2z of Huo-Ma-Tu structural belt in the south of Junggar Basin, the stages of hydrocarbon accumulation in studied area were determined. The evolution of paleo-fluid potentials and characteristics in Ex_2Z during different stages of hy- drocarbon accumulation process were reconstructed through the data of the fluid inclusions. The results show that the studied area experienced two periods of hydrocarbon accumulation process, the first period mainly occurred in middle-late Miocene （ about 14 - 9 Ma）, while the second period mainly occurred in middle-late Plioeene（ about 3.7 ~ 2.5 Ma）. The distribution characteristics of paleo-fluid potential during these two periods of hydrocarbon accumulation are significantly different. In the first period, Tugulu anticline area was in the lowest potential area, which became the favorable area for accumulation of oil generated from Cretaceous source rocks. In the second period, Manasi anticline area became the lowest potential area, in which the gas generated by coal measures source rocks in the middle and lower Jurassic accumulated.