中文摘要：

为研究温室气体CO2埋存及提高采收率注入过程对储层物性的影响,在室内开展了CO2-岩石-地层水相互作用的静态和动态实验。主要研究了饱和CO2地层水注入对储层岩石矿物的溶蚀作用、新矿物沉淀现象、地层水矿化度的变化情况以及储层渗透率的变化原因。结果表明：1）静态实验反应液中HCO3^-与岩石反应,出现CO3^2-液体呈弱酸性,黄铁矿导致Fe（OH）3沉淀生成;2）动态实验驱替过程中同时存在CO2的溶蚀作用和沉淀作用,沉淀作用较强,溶蚀作用较弱使得物性变差。该研究成果揭示了CO2-地层水-岩石的相互作用机理和储层渗透率变化的原因,为温室气体CO2规模化捕集与封存以及资源化利用提供了地球化学依据。

英文摘要：

In order to explore the influence of carbon dioxide storage and the injection processes on reservoir lithology and physical property, aiming at enhancing the oil recovery rates, static and dynamic experiments are designed to figure out the interaction process between CO2-saturated rocks and formation water. This experimental research mainly includes the process of mineral corrosion, dissolution while injecting the formation water saturated CO2 precipitation phenomenon of new minerals, and changes of formation water＇s mineralization degree. The results show that firstly, in the static experiments, bicarbonate ions mixing in the reacting fluids react with rocks, producing carbonate ions and making the fluids weak acid; meanwhile, the existence of pyrite leads to ferric hydroxide precipitation, secondly, with the procession of dynamic experimental displacement, corrosion effects and precipitation effects exist at the same time. Owing to the weak corrosion effects and the precipitation effects, the physical properties of formation rocks become worse. These results from the experimental researches reveal the mechanism of interaction processes between carbon dioxide saturated rocks and formation water, and the reason why formation permeability changes, providing the geochemical evidence for scale capture, the storage of carbon dioxide and resource utilization.