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Re-recognition of Deep Carbonate Dissolution Based on the Observation of in-situ Simulation Experiment
YANG Yunkun,LIU Bo,QIN Shan,LUO Ping,ZHANG Shanming,ZHOU Minghui,SHI Kaibo,TIAN Yongjing
Acta Scientiarum Naturalium Universitatis Pekinensis
A set of new carbonate dissolution in-situ experiments was designed to simulate the real burying process and to test its affection on fluid-rock reaction. By adoption DAC, the experimental process was controlled by the heater according to the paleothermal gradient of NE Sichuan. Experiment results indicate that limestone show precipitation with the increase of temperature and pressure. Dolomite is more stable than limestone in the whole experimental process, which shows a quite different result from the standpoint that dolomite is more dissoluble than limestone in high temperature and high pressure conditions. The “dissolution window” was not observed in the whole experimental process. The experimental researches may provide some new perspectives to the recognition of the formation and preservation mechanism for the deep carbonate reservoir.
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