CO2和地层水对储层物性的影响研究进展

Research Progress on the Influence of CO2 and Formation Water on Reservoir Physical Properties

戴彩丽 丁行行 于志豪 孙 鑫 高明伟 赵明伟 孙永鹏

DAI Caili DING Xingxing YU Zhihao SUN Xin GAO Mingwei ZHAO Mingwei SUN Yongpeng

CO2注入地层后溶解于地层水中形成碳酸，与地层岩石发生各种化学反应，分析反应对储层物性的影响及机理，对低渗、超低渗、致密油藏CO2驱具有重要意义。通过梳理CO2和地层水与岩石主要单矿物及复杂矿物的反应特征与机理，分析了碳酸作用后岩石的孔隙度、渗透率和润湿性等物性参数的变化及机理。CO2和地层水与致密储层岩石矿物发生的物理化学作用会影响储层物性特征，对低渗、超低渗、致密油藏驱油效率的提高具有一定的参考价值。图11表1参42

After CO2 was injected into the formation，it dissolved in formation water and formed carbonic acid. Various chemicalreactions occurred between carbonic acid and the formation rocks. The influence and mechanism of the reaction on reservoir physical properties were analyzed，which was of great significance for CO2 flooding in low permeability，ultra-low permeability and tight reservoirs. By analyzing the reaction characteristics and mechanisms between CO2，formation water and main single minerals，complex minerals of rock，the impacts and mechanisms of physical parameters such as porosity，permeability and wettability of rock after carbonation were reviewed. The physical and chemical interactions between CO2，formation water and rock minerals of tight reservoir would affect the physical properties of reservoir，which would provide some idea for the improvement of displacement efficiency in low permeability，ultra-low permeability and tight reservoir .

10.19346/j.cnki.1000-4092.2019.04.033