塔里木板块塔中-古城区块早-中奥陶世沉积格局

Depositional Framework of Early-Middle Ordovician in Tazhong-Gucheng Area in Tarim Plate

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 core drillings prove that slope facies sediments exist in the Middle-Lower Ordovician in Tazhong area.From the sedimentary characteristics,seismic reflection characteristics and regional stratigraphic thickness changes,this article discusses the depositional framework of the Early-Middle Ordovician in Tazhong and Gucheng areas where two isolated platform margin-slope systems are existed respectively,between which is separated by a relatively low Zhonggu trough.Such a depositional framework discovery is an important significance to exploring and delineating the platform margin high energy facies of the Middle-Lower Ordovician and expanding the oil and gas exploration blocks in these areas.