以露头和钻井资料为基础,结合层序地层学、生物地层学及沉积学理论,建立了塔里木盆地中上奥陶统碳酸盐岩层序格架,并探讨层序与礁滩体发育之间的关系.研究表明,中上奥陶统发育5个3级层序,其中塔中地区的良里塔格组3个3级层序可进一步划分为7个4级层序,塔中的良里塔格组中上部与塔北地区的桑塔木组多为同时异相关系,可见塔中与塔北良里塔格组为一明显的穿时地层单元;塔中良里塔格组共发育5期礁滩体,高频层序对礁滩体发育具有很好的控制作用,对礁滩储层预测有指导意义.

Based on the outcrop and drilling data, using the sequence stratigraphy, biostratigraphy and sedimentary theory, the Tarim Basin middle-upper Ordovician carbonate strata sequence framework and the relations between the sequence and the reef-shoal development are established. It is shown that the middle-upper Ordovician develops 5 third-grade sequences. The 3 third-order sequences of Lianglitage Formation in Tazhong area can be further divided into 7 fourth-order sequences, and the middle-upper Lianglitage Formation in Tazhong area and the Sangtamu Formation in Tabei area are contemporaneous heterotopic facies, so the Lianglitage Formation in Tazhong and Tabei is obviously a diachronism stratigraphic unit. The Liangligeta Formation in Tazhong area develops 5 periods of the reef beach body, the high-frequency sequences can well control the reef beach body development and is of great significance for the later reel-flat reservoirs prediction.