碳酸盐岩地层中不整合—岩溶风化壳油气田——以塔里木盆地塔河油田为例

Karst Weathering Crust Oil-Gas Field on Carbonate Unconformity: an Example from the Tahe Oilfield in the Ordovician Reservoir in the Tarim Basin

塔河油田是塔里木盆地北部沙雅隆起阿克库勒凸起上最典型的大型油气田。本文从圈闭要素及其各要素的演化、油气成藏演化等因素综合分析,认为该油气藏区域特征表现为受阿克库勒构造与岩溶凸起共同控制的层状背斜油气藏。从各个要素的成因及要素的组合、圈闭成因,考虑圈闭关键组成部分的主要特征,塔河油田奥陶系油气藏是一个碳酸盐岩不整合—岩溶风化壳油气藏。

The Tahe oil field is the most typical large oilfield located in the Akkol salient of the Xayar uplift in the northern Tarim basin. Studies on trap elements, and formation and evolution of pools indicated that the regional characteristics of pools are of layer anticlinal pools controlled by the Akkol structure and karst. Analysis on the origin and combination of the trap elements, origin of traps and main features of the traps suggested that the Ordovician pools in the Tahe oilfield are carbonate pools of unconformity and karst palaeo-weathering crust.