The stratigraphic and sedimentation analysis of Sugaitbulak Formation of the Upper Sinian at Xianerbulak of Aksu in Tarim Basin
Qian Yixiong1,2 You Donghua1 Chen Daizhao3 Chen Yue1,2 Jiang Haijian1 Liu Zhongbao2
1.Wuxi Institute, Exploration &|Production Research Institute, SINOPEC, Wuxi, Jiangsu 214151;2.Northwest Institute, Exploration &|Production Research Institute, SINOPEC, UrUmqi 830011;3.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
Sinian is one of the most important stage of development of passive continental margin basin in Tarim Basin.Based on the measurement and analysis of section of Sugaitbulak Fm.(Z2s)of the Upper Sinian at Xianerbulak of Aksu with regarded to lithofacies，sequence stratigraphy and facies succession fabric features and the orderly stacking patterns，The upliftcorrosion unconformity in the lower，transgressive onlap unconformity between upper and lower section and exposure meteoricformation and facies changecorrelative conformity on the top of Sugaitbulak Fm.(Z2s)have been identified as Ⅱ to Ⅲ（Ⅳ）sequence boundary surfaces.The sedimentation environment of Sugaitbulak Fm.(Z2s)is believed to the coastal to shore to open shalframp and slope clastic system，The lower section of Sugaitbulak Fm.consists of the tidalflat，shoredune，shore and foreshore and outer upper shore sedimentation； while the upper the nearshore，tidal channelouter shore and open shalframp and slope sedimentation； The terrestrial eruption of the basaltrhyolite and tuff，which are used to interpolation of diabase dyke，suggested as the continental breakup product in the development of passive continental margin basin of the Sinian to the early Palaeozoic stage.