二连盆地吉尔嘎朗图凹陷稠油成因

ORIGIN OF HEAVY OILS AT JIRGALANGTU DEPRESSION OF ERLIAN BASIN

窦立荣 杨涛

Don Lirong Yang Tao

吉尔嘎朗图凹陷位于二连盆地乌尼特坳陷西南端,为一北东走向,北断南超型凹陷,是早期沉陷、后期抬升的单旋回断陷。断陷内存在两种成因稠油:原生稠油和次生生物降解稠油。它们的形成机理和地质地化特征不同。原油的地化分析表明,吉尔嘎朗图凹陷西南斜坡区稠油藏是轻度-中度降解的低熟稠油。

Jiralangtu Depression is located at the southwestern part of the Wunit subbasin, Erlian Basin. It is a NE-trending half-graben with a fault belt in the north side and an overlap in the south side. The depression subsided in the early stage and uplifted in the late stage. Two kinds of genetic heavy oils could be found within the depression such as primary heavy oil and biodegraded heavy oil. Each of them has its own formative mechanism and geochemical features. Geochemical analysis of the crude oils shows that the heavy oil pools distributed along the southwestern slope of the Jirgalangtu Depression contain slightly-intermediately biodegraded immature heavy oils.

10.11743/ogg19950405