吐哈盆地油源研究新认识

在亚稳态条件下,用GC—MS—MS研究m/z233～262范围内二萜类的分布,发现吐哈盆地存在两种类型原油及相应的源岩.二叠系—三叠系所产原油富含扁枝烷,其主要来源于上二叠统塔尔郎组泥岩;中、下侏罗统原油富含17-阵四环烷,与中侏罗统西山窑组的煤有较密切的亲缘关系,显示了煤成油特点,在吐哈盆地煤成油具有重要意义.

NOVEL UNDERSTANDING OF THE STUDY ON THE COAL-DERIVED OIL OF TURPAN-HAMI BASIN

The study on the distribution of diterpanes with m/z 233-262 of the pre-Jurassic source rock and its correlated oil of the Turpan-Hami basin was performed on the GC-MS-MS analysis under the sub-steady state. It is found that there are two kinds of source rock in the basin. The oil of Permian-Triassic are rich in phyllocladan,sourced from mudsfone of Tarlang Formation of upper Permian. The source rock and oil of the Jurassic are rich in 17-nor-tetracgolane,which is one of the important characteristics of the coal-derived oil. By the study on the diterpane,it is found that,oil from the lower-middle Jurassic in this region has a good correlation with the coal beds of the Xishanyao formation, middle Jurassic, but differs considerably with the mudstone in the lower-middle Jurassic coal-measures. Thus,a striking conclusion is reached that the middle Jurassic coals are probably the main source rock of the Jurassic.