Diagenetic fluid evolution and water-rock interaction model of carbonate cements in sandstone: An example from the reservoir sandstone of the Fourth Member of the Xujiahe Formation of the Xiaoquan-Fenggu area, Sichuan Province, China

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• 作者：SiBing Liu (1)
  SiJing Huang (1)
  ZhongMin Shen (1)
  ZhengXiang Lü (1)
  RongCai Song (1)
  
• 关键词：carbonate cement ; carbon and oxygen isotope ratio ; fluid evolution ; water ; rock interaction ; West Sichuan Depression
• 刊名：Science China Earth Sciences
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：57
• 期：5
• 页码：1077-1092
• 全文大小：
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• 作者单位：SiBing Liu (1)
  SiJing Huang (1)
  ZhongMin Shen (1)
  ZhengXiang Lü (1)
  RongCai Song (1)
  
  1. State Key Laboratory of Oil-Gas Reservoirs Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, China
  
• ISSN：1869-1897

文摘

Carbonate cement is the most abundant cement type in the Fourth Member of the Xujiahe Formation in the Xiaoquan-Fenggu area of the West Sichuan Depression. Here we use a systematic analysis of carbonate cement petrology, mineralogy, carbon and oxygen isotope ratios and enclosure homogenization temperatures to study the precipitation mechanism, pore fluid evolution, and distribution of different types of carbonate cement in reservoir sand in the study area. Crystalline calcite has relatively heavy carbon and oxygen isotope ratios (δ 13C = 2.14- δ 18O = ?.77-, and was precipitated early. It was precipitated directly from supersaturated alkaline fluid under normal temperature and pressure conditions. At the time of precipitation, the fluid oxygen isotope ratio was very light, mainly showing the characteristics of a mixed meteoric water-seawater fluid (δ 18O = ?-, which shows that the fluid during precipitation was influenced by both meteoric water and seawater. The calcite cement that fills in the secondary pores has relatively lighter carbon and oxygen isotope ratios (δ 13C = ?.36- δ 18O = ?5.68-. This cement was precipitated late, mainly during the Middle and Late Jurassic. An important material source for this carbonate cement was the feldspar corrosion process that involved organic matter. The Ca2+, Fe3+ and Mg2+ ions released by the clay mineral transformation process were also important source materials. Because of water-rock interactions during the burial process, the oxygen isotope ratio of the fluid significantly increased during precipitation, by about 3- The dolomite cements in calcarenaceous sandstone that was precipitated during the Middle Jurassic have heavier carbon and oxygen isotope ratios, which are similar to those of carbonate debris in the sandstone (δ 13C = 1.93- δ 18O = ?.11-, demonstrating that the two are from the same source that had a heavier oxygen isotope ratio (δ 18O of about 2.2-. The differences in fluid oxygen isotope ratios during cement precipitation reflect the influences of different water-rock interaction systems or different water-rock interaction strengths. This is the main reason why the sandstone containing many rigid particles (lithic quartz sandstone) has a relatively negative carbon isotope ratio and why the precipitation fluid in calcarenaceous sandstone has a relatively heavier oxygen isotope ratio.