塔里木盆地库车坳陷白垩系巴什基奇克组物源精细分析

Provenance Analysis of Clastic Rocks in the Cretaceous Bashijiqike Formation at Kuqa Depression

库车坳陷白垩系巴什基奇克组碎屑岩具有巨大的油气勘探潜力。从岩石类型、构造属性、石英阴极发光特征、重矿物组合及古流向等方面对该区白垩系巴什基奇克组碎屑岩进行了物源分析,并首次将陆源碳酸盐岩分布特征用于物源研究。研究认为:研究区白垩系巴什基奇克组物源分别来自北部、东南部和西南部3个方向,即北部的天山、东南部的库鲁克塔格和西南部的温宿凸起,并在三大物源区的基础上划分出9个次级物源区。

The clastic rocks in the Cretaceous Bashijiqike Formation at the Kuqa depression of Tarim basin bear the tremendous potential for gas exploration.We use the lithology,tectonic property,quratz cathodoluminescence,heavy mineral combination,and paleo-flow direction to ascertain provenance of Cretaceous Bashijiqike Formation in this paper.We also consider the land carbonate as potential sources to discuss the provenance of clastic rocks.The results show that the clastic rocks in the Cretaceous Bashijiqike Formation at this area would source from three provenances like as northern South-Tianshang mountain,eastern-southeastern Kuluketage,Wensu high area of southwestern Kuluketage.