准噶尔盆地南缘原油地球化学特征

Geochemical behaviors of crude oil in the southern margin of Junggar basin

魏东涛 贾东 赵应成 杨海波 陈涛 吴梁宇 邵宏舜

Wei Dongtao Jia Dong Zhao Yingcheng Yang Haibo Chen Tao Wu Liangyu Shao Hongshun

通过系统分析区内原油的地球化学特征,将区内原油划分为三类六型,分别代表单一成因的煤系油(侏罗系,iv型)、湖相油(二叠系,(一七)型;白垩系,(一四)型;古近系,(一五)型)以及混源油(侏罗系和古近系,(九)型;侏罗系和二叠系,v型)。平面上不同构造单元的原油类型呈现出一定的差异,自东向西,阜康断裂带主要发现了iv类、(一七)类和v类油,齐古断褶带原油类型与阜康断裂带基本一致,还发现了(一五)类油,霍-玛-吐背斜带原油以(一四)类为主,四棵树凹陷原油主要是(九)类混源油和iv类煤系油,并提出了(一四)类白垩系生源油为本区油源的认识。

A comprehensive geochemical analysis of the crude oil samples frorn the southem margin of Junggar basin helps to classify them into six basic types of three categories.They are oil from the Jurassic coal measure(type (一七)),and from lacustrine source rocks of the Permian(type (一四)),Cretaceous(type (一五)),and Eogene(type (九)),and mixed oils from the Jurassic and the Eogene(type V),and from the Jurassic and the Eogene(type V).It is showed that different tectonic units from the east to the west have different types of oils.The type iv,type (一七),and type V,are found in Fukang fault zones.The Qigu faulted-fold belts have similar oil types to those of the Fukang fault zones but with the additional type (一五).While the Huoerguosi-Manasi-Tugulu anticline and Sikeshu sag are relatively simple with the former contains mainly type (一四) and later harbors type (九) and type iv.According to the above oil-source analyses,it is suggested that the (一四)-type oil from the Cretaceous should be the source of oil in the study area.

10.11743/ogg20070320