Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (2): 355-369.doi: 10.13278/j.cnki.jjuese.201702103

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Type of Dolomization and Formation Mechanism: A Case Study of Palaeogene Es1 in Qikou Sag

Gao Fuhong1, Zhang Yongsheng1, Pu Xiugang2, Yang Yang3, Zhang Zhongyue4   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Research Institute of Exploration and Development, Dagang Oilfield Company, PetroChina, Tianjin 300280, China;
    3. School of Prospecting & Surveying Engineering, Changchun Institute of Technology, Changchun 130021, China;
    4. Earthquake Administration of Liaoning Province, Shenyang 110034, China
  • Received:2016-06-25 Online:2017-03-26 Published:2017-03-26
  • Supported by:
    Supported by the National Natural Science Foundation of China(41502145)and Science and Technology Research Program of the 13th Five-Year from Education Department of Jilin Province(2016-0313)

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Abstract: In terms of the microscopic identification and geochemical analysis, study has been made on the dolostones of Palaeogene Es1 in Qikou sag. The result shows that there are microcrystalline-micritic dolomite, calcite dolomite, dolomite limestone, and a little grain dolomite. Sr/Ba ratio is from 0.4 to 4.9, V/Ni ratio is from 1.3 to 7.1, Z value distributed between 122.6~162.5, 87Sr/86Sr ratio of dolostone is extremely close to the seawater. According to the mentioned values, the lake basin was influenced by transgression activity, which brought a large number of Mg2+ for dolomization. The order degree of dolomite is between 0.22-0.53, Mg/Ca ratio is between 0.73-0.91, it has characteristics of rich in Ca2+ and poor in Mg2+, which indicates that the dolostone was formed during the penecontemporaneous period. Carbon and oxygen isotope analysis implies that the dolostone was formed in shallow burial environment, the extremely positive δ13C anomaly indicates that the process of dolomization was affected by fermentation, the abnormal high Sr value suggests an activity of bacteria. Based on the analysis above, the dolostone was formed in shallow burial environment during the penecontemporaneous period by the process of seepage-reflux and the process was affected by methanation.

Key words: Palaeogene, dolomization, carbon and oxygen isotopes, Qikou sag

CLC Number: 

  • P581
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