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Experimental simulation of dolomite dissolution under burial diagenesis conditions and thermodynamic interpretation

  • Huang Sijing 
  • Xiao Linping 
  • Yang Junjie 
  • Zhang Wenzheng 
  • Huang Yueming 
  • Liu Guixia 
Article

Abstract

Simulating experiments on dolomite dissolution by acetic acid were made under burial diagenesis conditions, at temperatures ranging from 75°C to 130° and pressures from 20 MPa to 30 MPa. The results show that the dissolution rate of dolomite increased rapidly with increasing temperature and pressure. From 75°C/20 MPa to 130°C/30 MPa, the total amount of released Ca and Mg increased from 32.98 mg/L to 337.9 mg/L, over one order of magnitude in difference. Thermodynamic calculation indicates that the increment of Gibbs free energy (△G) of the chemical reaction decreases with increasing temperature and pressure. This thermodynamic result is consistent with the experimental result. Based on the experimental results, it is suggested that secondary porosities formed by dolomite dissolution under conditions of deep burial diagenesis should be more common than those under epigenesis and shallow burial conditions, and therefore dolomite reservoirs in the formations that have been deeply buried should be more abundant than in the formations that have only been shallowly buried.

Key words

simulating experiment burial diagenesis dissolution of dolomite Gibbs free energy secondary porosity 

References

  1. Han Baoping, 1988, Study on the simulation of carbonate rock corrosion in Renqiu Oilfield: Carsologica Sinica v. 7, p. 81–88 (in Chinese with English abstract).Google Scholar
  2. Han Baoping, 1991, Simulation experiments of karstic water in Renqiu Oilfield: Experimental Petroleum Geology, v. 13, p. 272–279 (in Chinese with English abstract).Google Scholar
  3. Helgeson, H. C., 1978, Summary and critique of the thermodynamic properties of rock-forming minerals: Am. J. Sci., V. 278-A, p. 1–298.Google Scholar
  4. Helgeson, H. C., 1981, Theoretical prediction of the thermodynamic behavior of aqueous electrolytes at high pressures and temperatures, IV. Calculation of activity co-efficients, osmotic coefficient, and apparent molal and standard and relative partial molal properties to 600°C and 5 kb: Am. J. Sci., v. 281, p. 1249–1516.Google Scholar
  5. Huang Shangyu and Song Huanrong, 1987, The corrosion of carbonate rocks and environment temperature: Carsologica Sinica, v. 6, p. 287–296 (in Chinese with English abstract).Google Scholar
  6. Lan Zhengxue, 1989, Calculation of chemical thermodynamics: Xi’an, Scientific and Technical Publishing House of Shanxi, China, p. 514–573 (in Chinese).Google Scholar
  7. Muller, G., 1971, Methods in sedimentary petrology: Heidelberg, Hans-Schmincke, p. 190–191.Google Scholar
  8. Rauch, H.W. and White, W.B., 1977, Dissolution kinetics of carbonate rocks, 1. Effects of lithology on dissolution rate: Water Resources Research, v. 13, p. 181–194.CrossRefGoogle Scholar
  9. Song Huanrong and Huang Shangyu, 1990, Crystallized precipitation of carbonate: Carsologica Sinica, v. 9, p. 105–118 (in Chinese with English abstract).Google Scholar
  10. Wang Hongtao and Cao Yilin, 1988, Dynamic simulation of carbonate rock dissolution: Carsologica Sinica, v. 7, p. 63–72 (in Chinese with English abstract).Google Scholar
  11. Weng Jintao, 1987, The karst and carbonate rocks in Guilin: Chongqing, Chongqing Publishing House, Sichuan, China, p. 103–133 (in Chinese with English abstract).Google Scholar
  12. Yang Junjie and Huang Sijing, 1992, Experimental approach to the dissolution diagenetic process for clastic and carbonate rocks: Unpublished report of Changqing Bureau of Petroleum Exploration, p. 19–48 (in Chinese).Google Scholar
  13. Yin Hui’an, 1988, Petrologic phase equilibria: Beijing, Geological Publishing House, 304p. (in Chinese with English abstract)Google Scholar

Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 2000

Authors and Affiliations

  • Huang Sijing 
    • 1
  • Xiao Linping 
    • 2
  • Yang Junjie 
    • 3
  • Zhang Wenzheng 
    • 3
  • Huang Yueming 
    • 3
  • Liu Guixia 
    • 3
  1. 1.Chengdu University of TechnologyChengduChina
  2. 2.Southwest Jiaotong UniversityChengduChina
  3. 3.Changqing Petroleum Exploration BureauXi’anChina

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