Carbon Isotope Stratigraphy of the Cambrian System in the Eastern Tarim Basin,China  

作　　者：WANG Huajian SU Jin WANG Xiaomei YE Yuntao WANG Yu FANG Yu ZHANG Shuichang 

机构地区：[1]Research Institute of Petroleum Exploration&Development,Beijing 100083,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第4期1277-1293,共17页地质学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(2017YFC0603101);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA14010101);the National Natural Science Foundation of China(41872125,42102146,42002158)。

摘　　要：The ultra-deep Cambrian System in the Tarim Basin is an important field for petroleum exploration,while fine division of the Cambrian strata remains controversial.In recent years,carbon isotope stratigraphy of the Cambrian System has been established and widely used.Here,we report an integrated profile of carbonate and organic carbon isotopic values(δ^(13)C_(carb)andδ^(13)C_(org))from cuttings of the Tadong2 Well in the eastern Tarim Basin.Three carbon isotope anomalies of BACE,ROECE and SPICE were recognized on theδ^(13)C_(carb)profile.Three apogees and a nadir on theδ^(13)C_(org)profile and the onset of ROECE on theδ^(13)C_(carb)profile were suggested as boundaries of the present four series of the Cambrian System.Suggested boundaries are easily identifiable on the gamma logging profile and is consistent with the previous division scheme,based on biostratigraphic evidence in outcrop sections.Abnormal carbon cycle perturbations and organic carbon burials during the BACE and SPICE events might be related to the reduction and expansion of a huge dissolved organic carbon reservoir in the deep ocean of the ancient Tarim Basin.

关 键 词：organic carbon black shale dissolved organic carbon BACE SPICE stratigraphic division 

分 类 号：P597[天文地球—地球化学] P534.41[天文地球—地质学]