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利用野外露头、薄片、地震、测井等资料,并结合前人研究成果,进行了构造背景分析。塔河地区受加里东晚期、海西早期、海西晚期和燕山早期构造运动影响,大部分地区缺失志留系,目前主要在西南部钻遇志留系地层,且只保留了志留系下统柯坪塔格组及塔塔埃尔塔格组,发育滨海—浅海碎屑岩沉积体系。在识别出沉积体系类型的基础上,分析了塔河地区志留系有利储层特征,认为其储层纵向分布受构造运动及海平面升降变化控制,并预测其有利储层集中于柯坪塔格组下段、上段及塔塔埃尔塔格组。
Using the outcrops, thin slices, earthquakes and logging data, combined with the previous research results, the tectonic setting was analyzed. Due to the tectonic movements in the late Caledonian, early Hercynian, late Hercynian and early Yanshanian, the Tahe area lacks Silurian in most areas, and now mainly drills Silurian strata in the southwest, leaving only Silurian Tongkapingage Formation and Tata’ertage Formation, developing the coastal-shallow marine clastic sedimentary system. Based on the identification of sedimentary system types, the characteristics of the Silurian favorable reservoirs in the Tahe area are analyzed, and the vertical distribution of the reservoirs is controlled by tectonic movements and sea level changes. The favorable reservoirs are predicted to be concentrated in the Keping Tower The lower section of the grid group, the upper section and the tower El Tagh group.