塔中88井奥陶系吐木休克组的发现及地层划分

Discovery of Tumuxiuke Formation of Upper Ordovician in Tazhong-88 Well with Stratigraphic Division

塔中88井首次发现了中奥陶世晚期和晚奥陶世早期斜坡相牙形石化石,地震、测井资料进一步证实,塔中88井存在上奥陶统吐木休克组及中奥陶统一间房组。这些地层在塔中低凸起是首次发现。这一发现为塔中与轮南、英买力地区奥陶系对比、区域构造分析和沉积环境分析创造了条件。

In Tazhong-88 Well, the conodont fossils in the late of Middle Ordovician and the early of Late Ordovician slope facies have been found for the first time. The seismic and logging data indicate that there exists Tumuxiuke formation of Upper Ordovician and Yijianfang formation of Middle Ordovician in Tazhong-88 Well. The existence of these strata in Tazhong low swell becomes possible for the stratigraphic con＇elation of Ordovician and the analyses of regional structure and sedimentary environment among Tazhong, Lunnan and Yingmaili areas.