Sequence stratigraphic framework and sedimentary evolution of the Ordovician in northern Tarim Basin
Song Qian1, Ma Qing1, Dong Xujiang1, Liu Ying2, Gao Xiang1, Cao Kang1
1 School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,Sichuan; 2 National Engineering Research Center of China United Coal-bed Gas,Beijing 100095
Abstract：According to the theory and approach of sequence stratigraphy and sedimentary petrology,based on thorough analysis of the data of cores,thin sections,well logging in the three tectonic units of Lunnan,Halahatang,Yingmaili in northern Tarim Basin,combining with the previous study on main tectonic events and sea level changes,the sequence stratigraphic framework was estabished and the sedimentary characteristics and evolution were described. According to the regional unconformity surface,two 2nd-order sequences,SSQ1 and SSQ2,were identified. SSQ1 included the Lower and Middle Ordovician,SSQ2 included the Middle and Upper Ordovician. And then,on the basis of lithologic characteristics and lithofacies converting surfaces,eleven 3rd-order sequences(OSQ1-OSQ11)were identified. Further,according to the main marine flooding surfaces,the sequences were divided into transgressive system tract(TST)and highstand system tract(HST). The shallow-sea platform is the main sedimentary environment of the Ordovician in northern Tarim Basin and it experienced the evolutionary process of restricted platform,open platform and platform edge from the Early Ordovician to the Late Ordovician successively. Eventually,as detrital material of terrigenous origin filled in,the platform sedimentary environment in northern Tarim Basin was destroyed and developed into mixed platform.
Song Qian,Ma Qing,Dong Xujiang et al. Sequence stratigraphic framework and sedimentary evolution of the Ordovician in northern Tarim Basin[J]. JOPC, 2016, 18(5): 731-742.
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