Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 775-784.doi: 10.13278/j.cnki.jjuese.201703111

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Characteristics and Formation of the Cambrian Dolomite in Middle-South Sichuan Basin, China

Liu Lihong1,2, Du Xiaodi2, Xu Shouli2, Wen Huaguo3   

  1. 1. Institute of Oil and Gas/School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    2. Oil and Gas Survey, China Geological Survey, Beijing 100029, China;
    3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Received:2016-10-26 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by the National Science Foundation for Young Scientists of China (41402293)

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Abstract: The Cambrian strata in Sichuan basin are thick up to 1 000 m, and composed, from bottom to top, of mud shale, silty mudstone, calcite dolomite and dolomite. The major favorable reservoir is the dolomite in the Middle-Upper Cambrian Xixiangchi Formation. On basis of comparison of the Cambrian dolomite in middle-south Sichuan basin with those in Feixianguan-Changxing Formation in NE Sichuan basin and Ordovician system in Tahe oilfield, the analysis results of trace element, rare earth element and isotope of C, O, Sr have been involved to discuss characteristics and formation mechanism of the Cambrian dolomite in middle-south Sichuan basin. The research shows that the Cambrian dolomite in study area has relative high Fe and Mn content, with average content of 6 502.9×10-6 and 468.3×10-6, respectively. It also has relative low Sr Content, δ13C andδ18O, with average of 74.0×10-6, -2.38‰(VPDB) and -7.74‰(VPDB), respectively. It's concluded that the carbonate in middle-south Sichuan basin experienced the fresh water leaching. The diagenesis can be penecontemporaneous dolomization or mixing water dolomization.

Key words: Cambrian system in middle-south Sichuan basin, dolomite, dolomization mechanism, mixing water dolomization, Sichuan basin

CLC Number: 

  • P578.6
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