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Geochemical characteristics of the Cambrian marine carbonate elements and its petroleumgeological significance:Case study of Xiaoerbulake Formation in Keping area of Tairm Basin

Wang Zong-xin1,2,Lü Xiu-xiang1,2,Qian Wen-wen1,2   

  1. 1.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resources and Prospection,Beijing 102249,China
  • Received:2017-04-24 Revised:2017-06-09 Online:2017-07-10 Published:2017-07-10

Abstract:

The Lower Xiaoerbulake Formation in Keping area of Tarim Basin has become a significant sequence for evaluating and superseding.According to the analysis on trace element and REE of 40 samples and the variation of TOC,the results show there is no correlation between Ce/Ce* and Eu/Eu*,(La/Sm)SN,and REE.The diagenesis has little effect on the content of elements,and the data can reflect the real environment in the sedimentary period.Using the Ti element to exclude the terrigenous influence of Ba,Cu and Zn and obtain the corrected values of the biogenic elements,Baxs,Cuxs and Znxs,and their synthesis coefficients,Y.The results show the paleoproductivity level of the lower part in the Lower Xiaoerbulake Formation is higher than the upper in the vertical.The TOC has maximum value,5.14%,mean 1.96%,and is generally similar to that of the characteristics of the paleproductivity level.The U/Th,V/(V+Ni),δU and Ceanom to judge the Xiaoerbulake Formation in hypoxia and anoxic environment during the time of deposition with later destruction confirms the process of regression after Early Cambrian transgression.The sea level variation is characterized by Mi/Ti,which shows the change process of shallow and stable to deep with the volatility and then to the most shallow and stable,and the middle.The lower part of the Lower Xiaoerbulake Formation is a good potential hydrocarbon source rock based on the above indexes and the TOC.

Key words: Lower Xiaoerbulake Formation, Keping area, Tarim Basin, Geochemical characteristics, Paleoproductivity, Paleoredox, TOC

CLC Number: 

  • TE357

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