塔里木盆地石油地质几个问题的探讨

本文主要阐明塔里木盆地,是以新生代压扭应力形成的山前盆地,迭加在中新生代形成的分割性断陷盆地之上,并构成统一的盆地;根据石炭纪岩石的不溶残渣、微量元素、氧、碳同位素及粘土矿物的分析,推测盆地在该时期是一南深北浅的箕状盆地;盆地的生油岩以侏罗系最为有利,但分布范围小;石炭系—二迭系次之,它分布广,生油潜力大;上白垩统一下第三系更次,有一定的分布范围。     

SOME PROBLEMS CONCERNING PETROLEUM GEOLOGY OF THE TARIM BASIN

This paper gives mainly an explanation that the Tarim Basin is a unified piedmont basin formed in the Cenozoic by shear stress and superimposed on a dissected fault depression basin of the Middle Cenozoic. According to our analysis of the insoluble residues of Carboniferous rocks, trace elements, oxygen and carbon isotopes and clay minerals, the basin was then a dustpan-like one with the southern part deeper than the northern part.From the viewpoint of oil generation, the most favorable should be the Jurassic source rock (though limited in distribution), the less——the Carboniferous-Permian rocks which feature wide distribution and ample potentialities of oil generation, and the least——the Cretaceous-Eogene rocks which are found in a certain area.