塔里木地台晚白垩世—早第三纪岩相古地理概貌

LITHOFACIES AND PALEOGEOGRAPHY OF THE LATE CRETACEOUS——PALEOGENE OF THE TARIM PLATFORM

雍天寿

Yong Tianshou

石油工业部新疆石油管理局

The Petroleum Administration of Xinjiang Ministry of Petroleum Industry

塔里木地台在晚白垩世大体上可分为东塔里木沉积区、柯坪—巴楚陆源剥蚀区和西塔里木沉积区。早第三纪基本上保持了这一总的古地理格局(图1、图2)。

During late Cretaceous the Tarim platform was divided roughly into three zones. They were the eastern Tarim depositional zone, the Kepin-Bachu erosion zone and the western Tarim depositional zone. This framework of the paleogeography of the Tarim platform was essentially kept on in Paleogene. The marine upper Cretaceous-lower Tertiary systems of the western Tarim depositional zone were foundamentally of supratidal and intertidal facies. These facies zones were not favourable for generating oil. The promising sections for oil generation were as follows: upper and medium Kukebai formation, Yigeziya formation, lower Qimgen formation, Karatar formation and lower Uragen formation. The organic matter in these formations is of sapropel type. They are regarded as poor source rocks according to various oil generation indicators.

https://doi.org/10.11781/sysydz198401009