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The equilibrium between diagenetic calcites and dolomites and its impact on reservoir quality in the sandstone reservoir of Kela 2.gas field

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Progress in Natural Science:Materials International 2007年第9期17卷 1051-1058页

作者： gao zhiqian1,yu bingsong2.3.and lai xingyun2.3.1.school of energy resources,{2. University of {3.,beijing 100083.china 2.State Key Laboratory of Geological Processes and Mineral resources,{2. University of {3.,beijing 100083.china 3.Ministry of Education Key Laboratory of Lithosphere Structure,Deep Processes and Exploration Technique,{2. University of {3.,beijing 100083.china) school of energy {2. China University of Geosciences Beijing 100083 China State Key Laboratory of Geological Processes and Mineral resources China University of Geosciences Beijing 100083 China Ministry of Education Key Laboratory of Lithosphere Structure Deep Processes and Exploration Technique China University of Geosciences Beijing 100083 China

Based on the equilibrium theory of chemical reactions between water and rocks,this paper establishes a thermodynamic phase relationship diagram among calcites,dolomites and water solution under the condition of diagenesis based on the thermodynamic database of related minerals and fluids and dolomite's degree of order *** has been discovered that the equilibrium between calcites and dolomites in the diagenetic environment is strongly impacted by temperature and the Ca/Mg ratios in groundwater,and that the dolomite's degree of order in the diagenetic environment is a function of crystallization temperature and time,not controlled by water ***,the authors make a further analysis of the close relationship of chemical reaction between carbonate cements and pore water in the sandstone reservoirs of Kala 2.gas field in Kuche *** can be seen that there are different impacts on sandstone reservoir quality among the equilibrium system of calcites,dolomites and pore water at different depths of reservoirs.

关键词： diagenesis equilibrium between calcites and dolomites secondary pores Kela 2.gas field

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