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从沉积特征、地震反射特征和区域地层厚度变化等方面探讨了塔中和古城地区早中奥陶世的沉积格局。研究表明,塔中地区和古城地区分别存在两个孤立的台地边缘-斜坡体系,之间由一个相对低洼的中古海槽所间隔。孤立台地-海槽沉积格局的确立,对寻找和圈定中下奥陶统台缘高能相带以及扩大该区的油气勘探领域具有重要的意义。
The depositional pattern of early Middle Ordovician in Tazhong and Gucheng area is discussed from sedimentary characteristics, seismic reflection characteristics and the change of regional formation thickness. The study shows that there are two isolated platform margin-slope systems in Tazhong area and the ancient city respectively, which are separated by a relatively low-lying Middle Trough. The establishment of the isolated platform-trough sedimentary pattern is of great significance in the search and delineation of the high-energy facies belt along the margin of the Lower Ordovician margin and the expansion of oil and gas exploration in this area.