Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 310-322.doi: 10.13278/j.cnki.jjuese.20170219

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Dolomitization Model of Lower Qiulitage Group in Tabei Area

Li Bin1,2, Peng Jun1,2, Xia Qingsong1, Yang Suju3, Hao Yueqi1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;
    3. Design and Planning Institute of SINOPEC Northwest Company, Urumqi 830011, China
  • Received:2017-09-01 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by Project of State Key Laboratory of Oil and Gas Reservoir Geology and Exploration(PLN201616) and Project of Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education(TPR-2013-16)

Abstract: This study is aim to clarify the complex dolomitization of dolostone in the Lower Qiulitage Group. Through analysis, the authors believe that the seepage reflux dolomitization was promoted by the migration of high concentration brine in marginal zone during the early shallow burial environment, which formed the residual particle dolomite with phantom structure with the characteristics of negative carbon and oxygen isotopic values, lower content of trace element iron, manganese, strontium and barium. The second stage fluid was mainly residual high salinity formation water in pore, which enhanced the dolomite recrystallization under the burial compaction, and caused the crystalline structure widely developed with the characteristics of positive oxygen isotopic and negative carbon isotopic values, high content of manganese and lower content of iron, lower content of strontium and higher content of barium. The inter-granular pores and dissolved pores were developed in this period. The third stage fluid was mainly hot magnesium-rich hydrothermal fluid along the basement faults, which formed a large number of saddle dolomite by tectonic and hydrothermal dolomitization with high content of manganese, lower content of iron, and negative oxygen isotopic values.

Key words: Tabei area, the Lower Qiulitage Group, dolomite, tectonic-hydrothermal action

CLC Number: 

  • P588.245
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