准噶尔盆地腹部地区油气成藏期次划分

系统采集了准噶尔盆地腹部地区61块样品,检测所捕获的各期流体包裹体的均一温度、盐水包裹体的盐度,并观察了烃类流体包裹体荧光颜色。经过系统分析表明,准噶尔盆地腹部地区发生过4次油充注,均一温度分别为:29.8～57.8℃,74.6～90.7℃,107.4～117.3℃,135.3～145.8℃,对应的同期盐水包裹体均一温度范围分别为:65～80℃,80～100℃,100～120℃,135～150℃。

Determination of Hydrocarbon Accumulation Stages in Hinterland Area of Junggar Basin

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.