以米氏旋回为标尺进行高级别层序地层划分与对比——以准噶尔盆地中Ⅰ区块为例

准噶尔盆地中Ⅰ区块在三工河组二段沉积时期，盆大水浅，沉积旋面变化快，由于缺乏高级别层序划分的天然标准，高级别层序划分意见难以统一。依据旋回地层学研究方法识别出的米氏旋回作为层序地层划分和对比的标尺，对三工河二段四级、五级层序进行划分和对比，保证了研究区各条剖面高级别层序划分方案的统一性，提高了高分辨率层序地层格架的准确程度。研究表明，所建立的高分辨率层序地层格架与实际区域地质认识是完全吻合的。

High -resolution sequence stratigraphic classification and correlation by using Milankovitch Cycles as rulers——taking the Zhong I block in Junggar Basin as an example

During the deposition of the 2nd member of Sangonghe Formation in Zhong I block of Junggar Basin,the basin was wide and shallow with rapid change of sedimentary cycles. Various classification ideas appeared for high-grade sequence because of lacking of natural standard for the high-grade sequence classification. In the course of classification and correlation of forth-order sequences and fifth - order sequences of the 2nd member of Sangonghe Formation, Milankovitch Cycles, which is recognized by cycle sequence method,have been used as the criterion in sequence stratigraphic classification and correlation. Consequently, the coherence of high-grade sequence classification program a-mong different sections in the whole research area can be used, and thus the accuracy of the high - resolution sequence strati-graphic frame can be ensured. The established stratigraphic frames are consistent with the geological information collected before.