吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (2): 310-322.doi: 10.13278/j.cnki.jjuese.20170219

• 地质与资源 • 上一篇    下一篇

塔北地区寒武系下丘里塔格群白云石化模式

李斌1,2, 彭军1,2, 夏青松1, 杨素举3, 郝悦琪1   

  1. 1. 西南石油大学地球科学与技术学院, 成都 610500;
    2. 西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500;
    3. 中国石化西北油田分公司勘探开发研究院, 乌鲁木齐 830011
  • 收稿日期:2017-09-01 出版日期:2019-03-26 发布日期:2019-03-28
  • 作者简介:李斌(1977-),男,副教授,博士,主要从事油气成藏的教学和科研工作,E-mail:lbin@swpu.edu.cn
  • 基金资助:
    油气藏地质及开发工程国家重点实验室基金（PLN201616）；"构造与油气资源"教育部重点实验室基金（TPR-2013-16）

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)

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摘要： 针对塔北上寒武统下丘里塔格群复杂的白云石化作用，通过岩石学和地球化学分析认为下丘里塔格群埋藏后主要经历3期白云石化流体作用：早期浅埋藏环境下高浓度卤水在台缘带的迁移促进了渗透回流白云石化作用发生，形成残余颗粒幻影结构的粉晶白云岩，具有碳氧同位素负偏和微量元素Fe、Mn、Sr、Ba元素质量分数较低的特征；第二期流体主要为地层孔隙残余高盐度海水，在埋藏压实作用下白云岩发生重结晶作用，晶粒结构广泛发育，具有同位素碳正氧负和微量元素呈现富Mn贫Fe及低Sr高Ba的特征，该时期是晶间孔和晶间溶孔发育的主要时期；第三期流体主要为沿基底断裂上涌的高温富镁热液流体，发育构造-热液白云石化作用形成大量鞍状白云石，具有富Mn贫Fe和氧同位素负偏明显等特征。

关键词: 塔北地区, 下丘里塔格群, 白云石化, 构造-热液作用

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

中图分类号: 

  • P588.245
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