Fabric types of microbialites from the Stage 3 of Cambrian Series 2 in Sugaitebulake section, Tarim Basin
Li Ying1,2,3, Pan Wen-Qing4, Wu Ya-Sheng1,2,3, Yang Guo4, Sun Chong-Hao4, Jiang Hong-Xia5
1 Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029,China; 2 Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China; 3 University of Chinese Academy of Sciences,Beijing 100049,China; 4 Research Institute of Petroleum Exploration and Development,Tarim Oilfield Company,PetroChina,Xinjiang Korla 841000,China; 5 Institute of Paleontology,Hebei GEO University,Shijiazhuang 050031,China
Abstract The Xiaoerbulake Formation(Stage 3, Cambrian Series 2)in the Aksu area of the Tarim Basin is mainly composed of microbial dolostone with its reprehensive section at Sugaitebulake,90 km southwest of Aksu city. This formation can be ideal petroleum reservoirs for its good pores which has been extensively studied. Due to serious diagenesis alteration,however, their features have not been fully identified,which causes difficulty in understanding their formative processes and hampers the petroleum exploration. Here,based on detailed observation on outcrops and thin sections,we identified four types of microbialite fabrics,including thrombolitic fabric,laminated fabric,intraclastic fabric and framestone fabric,and established high-precision vertical evolutionary sequence of microbialites. The thrombolitic and the laminated fabrics can be further subdivided. The Members Ⅰ to Ⅲ are mainly composed of thrombolitic dolostone,thrombolitic-laminated dolostone and laminated dolostone. The Member IV consists of microbial thrombolite mounds,whereas the lower Member V is net-thrombolitic dolostone and the upper Member V intraclastic dolostone and Renalcis framestone. This study reveals that the original fabrics have been affected by dolomitization,recrystallization and dissolution,and the alteration degree of the microbialite fabric is more severe in the lower parts of this formation. The intraclastic fabric has the strongest resistance to diagenesis,followed by the laminated fabric,and then the thrombolitic fabric. The Members Ⅰ to Ⅲ represent tidal flat environments;the Member Ⅳ and the lower Member Ⅴ represent deep subtidal environments;the upper Member Ⅴ represents shallower subtidal environments.
Fund:National Science and Technology Major Projects (No.2016ZX05004-004),“Strategic Priority Research Program(B)”of the Chinese Academy of Sciences(No. XDB26000000), and National Natural Science Foundation of China(No.41972320)
Corresponding Authors:
Wu Ya-Sheng,born in 1963,is an associate professor of Institute of Geology and Geophysics,Chinese Academy of Sciences and adjunct professor of University of Chinese Academy of Sciences,with main research interests in biosedimentology microbialites,reefs and paleoecology. E-mail: wys@mail.igcas.ac.cn.
About author: Li Ying,born in 1997,a master degree candidate,is engaged in research of biosedimentology. E-mail: lilynut@163.com.
Cite this article:
Li Ying,Pan Wen-Qing,Wu Ya-Sheng et al. Fabric types of microbialites from the Stage 3 of Cambrian Series 2 in Sugaitebulake section, Tarim Basin[J]. JOPC, 2020, 22(4): 663-679.
Li Ying,Pan Wen-Qing,Wu Ya-Sheng et al. Fabric types of microbialites from the Stage 3 of Cambrian Series 2 in Sugaitebulake section, Tarim Basin[J]. JOPC, 2020, 22(4): 663-679.
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