Experimental Simulation for Dolomite Dissolution under the Conditions of Burial Temperature and Pressure
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摘要: 埋藏成岩作用的温度与压力条件（７５℃～１３０℃，２０ＭＰａ～３０ＭＰａ）下，乙酸对白云岩的溶蚀实验证明，随着温度与压力的升高，白云岩的溶解速率迅速增大。Ｃａ、Ｍｇ释放合量由７５℃、２０ＭＰａ条件下的３２.９８ｍｇ/Ｌ增至１３０℃、３０ＭＰａ条件下的３３７.９ｍｇ/Ｌ，增加了一个数量级。在各种温压条件中，１００℃、２５ＭＰａ溶蚀效果最好。实验结果说明，深埋藏条件下，白云岩溶解形成的次生孔隙将比其在浅部的表生环境中更为发育，因而２０００ｍ以下的深埋藏成岩环境中，白云岩储层比浅部地层更为发育。Abstract: Experiment for dolomite dissolution by acetic acid has been run under the conditions of temperature and pressure of burial diagenesis (75-130 ℃, 20-30MPa). The result shows that Dissolution rate of dolomite increases quickly with the increase of temperature and pressure. From 75℃. 20MPa to 130℃, 30MPa, the total releasing quantity of Ca2+ and Mg2+ increases from 32.98 mg/L to 337.9 mg/L, increasing more than 10 times. The temperature of 100℃ and pressure of 25 MPa are the best condition for dolomite dissolution.According to the result of experiment, We can predict that the secondary porosity formed by dolomite dissolution under deep burial diagenesis environment should be more common than that under epigenesis and shallow burial environment. So dolomite reservoir of deep burial strain should be more popular than that of shallow burial strain.
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