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Experiment on Debris-Arkosic Sandstone Reformation by CO2 Fluid

QU Xi-yu1, LIU Li, MA Rui1, HU Da-qian1, CHEN Xue2，WANG Yan-ming3   

  1. 1.College of Earth Sciences, Jilin University, Changchun 130061, China;2.Eastern China Geological & Mining Organisation for Nonferrous Metals,Nanjing 210007,China;3.Team 603,Bureau of Nonferrous Metal GeoexpLoration of Jilin Province, Hunchun,Jilin 133000, China
  • Received:2008-04-08 Revised:1900-01-01 Online:2008-11-26 Published:2008-11-26
  • Contact: QU Xi-yu

Abstract: The reformation of debris-arkosic sandstone by the CO2 fluid is researched under different temperature and pressures using interaction experiments of the CO2/H2O/sandstone system in a closed container. The results of the total mineralization degree of reaction liquid, the loss of sample weight after reaction and scanning electronic microscope (SEM), indicate that the corrosion intensity of feldspar, calcite and quartz gradually enhance with the temperature increasing, and the corrosion of sandstone dissolved by CO2 has positive correlation with the temperature. At the same time, an unknown silicate mineral is found on the surface of sample at 200 ℃and 300 ℃ by SEM observation. The mechanism of the mineral dissolving and precipitation has been interpreted by the variation in pH value and in ionic density of the reaction liquid.

Key words: CO2, debris-arkosic sandstone, hydrothermal experiment, solution, precipitation

CLC Number: 

  • P588.2
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