J4 ›› 2011, Vol. 41 ›› Issue (4): 1020-1027.

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Thermodynamic Equilibrium of Calcite in Strata Environment and Its Application of Burial Karst Forcasting in Tahe Oil Field, Tarim Basin

RUAN Zhuang1, YU Bing-song2, LI Zhao-hui3, ZHU Xiao-min1   

  1. 1.State Key Laboratory of |Petroleum Resource and Prospecting, China University of Petroleum, Beijing102249,China;
    2.State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing100083, China;
    3.Exploration and Development Institute of Jilin Oilfield, Songyuan138000, Jilin, China
  • Received:2010-09-29 Online:2011-07-26 Published:2011-07-26

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Abstract:

The solubility of calcite in the diagenesis is closely related to the chemistry of groundwater and the temperature. According to the reaction equilibrium of CaCO3 and activity of Ca2+ in groundwater, the solubility of calcite in different temperatures and pressures could be calculated. The pH value and the temperature of solution are the main factors to control the solubility of calcite. The dissolving tendency of calcite could be judged by the Gibbs free energy. The condition with ΔG<0 in the solution is favorite to dissolution of calcite and that with   ΔG>0 is favorite to deposit of calcite. The ΔG of groundwater in thirty-four wells are calculated, Tahe oilfield. The results show that: present groundwater conditions favor the dissolution of calcite, the calcite tends to dissolute more in west and south area. This water-rock reaction theory can be used to quantitative understand the burial karst tendency and support the reservoir evaluaterating.

Key words: Gibbs free energy, equilibrium constants, dissolving tendency, calcite, karst

CLC Number: 

  • P618.13
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