A Study On Sedimentary Characteristics And Sedimentary Evolution Of Nanhua System,Southwest Tarim Basin

In order to clarify the stratigraphic division and sedimentary characteristics of the Nanhua System in the Tarim Basin,Based on the field profile,the detailed characteristics of the rock assemblage characteristics and distribution are obtained.Combined with the previous studies,the analysis of the comprehensive samples shows that the Nanhua of Tarim Basin The formation is composed of two groups in the Aksu-Wushi area in Xinjiang,namely,the Qiaoenbulake Group and the Youermeinake group.The Qiaoenbulake Group can be divided into Xifangshan Group,East Qiaoenbulake Group,Muyangtan Group and Dongwu Group.The East Qiaoenbulake Formation is mainly composed of thick layer of pale and morgue.Muyangtan group is mainly gray-green and purple-rich calcareous sandstone section.The Youermeinake group also saw a set of moraine conglomerates.In the Tiekelike area,the stratigraphic bottom can be divided into the Yalaguzi Formation,the Qiakemakelike Group(the group is bottom-up for the Bolong,Kelixi and Yutang groups).Due to the distance between the north and the south,the strong tectonic action of the geological history period leads to the change of the north and south thickness of the strata.Based on the analysis of the outcrop data in the study area and the comprehensive analysis of the sampling and analysis,the coastal facies of the Aksu-Wushi area in the western Tarim Basin and the Nanhua Formation of the Xinzang Highway section of the Tiekelike area,Shallow sea phase,ice water phase three sedimentary facies.In the northwest Aksu-Wushi area,the shallow glacial facies is ice-water phase,and the southwest margin of the Crick region is characterized by shallow marine sediments,and the later stage is the coastal facies deposit.In the western part of the basin,there are three sedimentary evolution cycles of glacial and interglacial periods.The sedimentary characteristics of the glacial period are more obvious,grayish purple,purple or grayish green morcise conglomerate.The interglacial sedimentary environment is mainly coastal facies and shallow marine facies.