关键词: 准噶尔盆地, 流体包裹体, 油气成藏期次

Abstract: Three source sags located in the hinterland area of Junggar basin are the western Pen-1 well sag, Changji sag and northern Dongdaohaizi sag, in which there exist two sets of hydrocarbon source rocks (Permian and Jurassic) . They are characterized by the fact that the same set of source rocks in different sags is of different oil thresholds; the different source rocks in the same source sag are of different oil thresholds, too. The fact means that there should be multi-source and multi-stage hydrocarbon supplies/charging in this area, and the four times of tectonic movements (Late Hercynian, Indo-Sinian, Yanshan and Himalayan movements) resulted in the multi-stage hydrocarbon migrations. This paper detects 61 fluid inclusion samples gathered from 4 wells in the hinterland area, including the homogeneous temperatures for fluid inclusions of each stage, the salinities for aqueous inclusions and the fluorescence colors for hydrocarbon inclusions. The result indicates that there might be four times of oil charging events in this hinterland area with the homogeneous temperatures of hydrocarbon inclusions by 29.8～57.8℃, 74.6～90.7℃, 107.4～117.3℃, 135.3～145.8℃, and those of corresponding coexisting aqueous inclusions by 65～80℃, 80～100℃, 100～120℃ and 135～150℃, respectively.

Key words: Junggar basin, fluid inclusion, hydrocarbon accumulation, stage