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Activity of Silica-Rich Hydrothermal Fluid and Its Impact on Deep Dolomite Reservoirs in the Sichuan Basin, Southern China
  • 2024-01-08
元数据
名   称 Activity of Silica-Rich Hydrothermal Fluid and Its Impact on Deep Dolomite Reservoirs in the Sichuan Basin, Southern China
科技资源标识 CSTR:11738.14.NCDC.XDA14.PP5754.2024
DOI 10.3969/j.issn.1000-9515.2017.06.017
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摘   要 Well-developed dissolution pores occur in the dolomites of the Sinian Dengying Formation, which is an important oil and gas reservoir layer in the Sichuan Basin and adjacent areas in southern China. The pores are often filled with quartz, and some dolomites have been metasomatically altered to siliceous chert. Few studies have documented the characteristics, source or origin of silica-rich fluids and their effects on the dolomite reservoir. The peak homogenisation temperatures (Th) of fluid inclusions in pore-filling quartz are between 150°C and 190°C, with an average of 173.7°C. Gases in the inclusions are mainly composed of CO2, CH4 and N2. Compared with host dolomite, pore-filling quartz and metasomatic chert contain higher amounts of Cr, Co, Mo, W and Fe, with average concentrations of 461.58, 3.99, 5.05, 31.43 and 6666.83 ppm in quartz and 308.98, 0.99, 1.04, 13.81 and 4703.50 ppm in chert, respectively. Strontium levels are lower than that in the host dolomite, with average concentrations in quartz and chert of 4.81 and 11.06 ppm, respectively. Rare earth element compositions in quartz and chert display positive Eu anomalies with a maximum δEu of 5.72. The δDSMOW values of hydrogen isotopes in water from quartz inclusions vary from –85.1‰ to –53.1‰ with an average of –64.3‰, whereas the δ18OSMOW values range from 7.2‰ to 8.5‰ with an average of 8.2‰ The average 87Sr/ 86Sr ratios in quartz and chert are 0.711586 and 0.709917, respectively, which are higher than that in the host dolomite. The fluid inclusions, elemental and isotopic compositions demonstrate that the formation of quartz and chert was related to silica-rich hydrothermal fluid and that the fluid was the deep circulation of meteoric water along basement faults. Interactions with silica-rich hydrothermal fluids resulted in densification of dolomite reservoirs in the Dengying Formation through quartz precipitation and siliceous metasomatism. However, it increased the resistance of the host dolomite to compaction, improving the ability to maintain reservoir spaces during deep burial. Evidence for silica-rich hydrothermal activity is common in the Yangtze Platform and Tarim Basin and its influence on deep dolomite reservoirs should be thoroughly considered.
学科分类
170.50
关键词
Dengying Formation dolomite silica-rich hydrothermal fluid quartz rare earth element Sichuan Basin
作者 Dongya ZHU,Dianwei ZHANG,Quanyou LIU,Zhijun JIN,Zhiliang HE
数据量 1.4 MiB
论文类型： journal
论文网址： https://doi.org/10.1111/1755-6724.13459
期刊名称： ACTA GEOLOGICA SINICA (English Edition)
出版时间： 2017-12-01
引用和标注
数据引用
Dongya ZHU,Dianwei ZHANG,Quanyou LIU,Zhijun JIN,Zhiliang HE. Activity of Silica-Rich Hydrothermal Fluid and Its Impact on Deep Dolomite Reservoirs in the Sichuan Basin, Southern China. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP5754.2024.
Dongya ZHU,Dianwei ZHANG,Quanyou LIU,Zhijun JIN,Zhiliang HE. Activity of Silica-Rich Hydrothermal Fluid and Its Impact on Deep Dolomite Reservoirs in the Sichuan Basin, Southern China. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://www.doi.org/10.3969/j.issn.1000-9515.2017.06.017.
许可协议
知识共享许可协议   本作品采用 知识共享署名 4.0 国际许可协议进行许可。
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