准噶尔盆地西北缘稠油成因和原油早期成烃机制的探讨

AN APPROACH OF ORIGIN OF HEAVY OIL IN NORTHWESTERN MARGIN OF JUNGGAR BASIN AND ITS EARLY FORMED HYDROCARBON MECHANISM

准噶尔盆地西北缘的油源问题和原油的成烃机制,据地球化学研究认为,稠油是次生成因的,原油来源于上古生界生油岩,原油分成三种类型,Ⅰ类原油为“早期成烃”机制的产物,Ⅱ类原油为“晚期成烃”机制的产物,Ⅲ类原油为过渡类型。西北缘已探明和开发的原油绝大部分为Ⅰ类原油。

Based on geochemistry studies of oil geneses and crude hydrocarbon-formed mechanism in northwestern margin of Junggar Basin,it has been considered that origin of the heavy oil should be secondary in nature and emerged from Upper Paleozoic source rocks. This oil can be classified into three types: type Ⅰ is the product of 'early formed hydro- carbon'mechanism; type Ⅱ is the product of'late formed hydrocarbon'mechanism;type Ⅲ is a transition one. The most crude oil that prospected and developed in the northwestern margin is type Ⅰ in nature.