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Shui leilei, Liang ru, Meng Xianghao, Guo Laiyuan, Xu Kewei. Characteristics of fluid inclusions in quartz fractures in Ledong area of Yinggehai Basin and its constraints on gas accumulation[J]. Sedimentary Geology and Tethyan Geology, 2020, 40(1): 45-52. DOI: 10.19826/j.cnki.1009-3850(2020)01-0045-08
Citation: Shui leilei, Liang ru, Meng Xianghao, Guo Laiyuan, Xu Kewei. Characteristics of fluid inclusions in quartz fractures in Ledong area of Yinggehai Basin and its constraints on gas accumulation[J]. Sedimentary Geology and Tethyan Geology, 2020, 40(1): 45-52. DOI: 10.19826/j.cnki.1009-3850(2020)01-0045-08
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Characteristics of fluid inclusions in quartz fractures in Ledong area of Yinggehai Basin and its constraints on gas accumulation

  • 1 CNOOC Experiment Center(Zhanjiang), Engineering Technology Branch of CNOOC Energy Development Co., Ltd. Zhanjiang 524057, China;

  • 2 Engineering Technology Branch of CNOOC Energy Development Co., Ltd. Tianjin, 300452, China;

  • 3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(CDUT), chengdu, 610059

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  • Received Date: October 31, 2019
  • Revised Date: February 11, 2020
  • Published Date: March 29, 2020
    Graphical Abstract
    • Abstract
  • Ledong area in Yinggehai basin is a typical field of high temperature and overpressure gas exploration in China. A large number of fluid inclusions are trapped in the quartz grains of sandstones in Huangliu Formation. Studying its characteristics and composition can analyze the information of gas accumulation in this area. According to the petrography, micro temperature measurement and laser Raman analysis of fluid inclusions, there are two types of fluid inclusions in the Huangliu formation quartz grain fracture: homogeneous and heterogeneous capture. The normally trapped fluid inclusions are mainly distributed between 155-165℃ and 170-180℃, and the compositions of fluid inclusions are CO2 (gas) and H2O (liquid) or CO2 (gas) and CO2 (liquid) and H2O (liquid). The characteristics of fluid inclusions indicate that the Huangliu formation in Ledong area experienced at least two periods of CO2 rich hydrothermal activity, recording the information of inorganic CO2 filling and reservoir formation in the late burial stage during volcanic activity or deep fault development.
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    • References (22)
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