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储层敏感性评价的目的是研究储层损害机理,为保护储层提供可靠的依据。鄂尔多斯盆地张韩地区储层物性较差,属于中孔-低渗到低孔-特低渗储层,从敏感性实验分析入手,测量不同样品的敏感性指数,从而分析并确定了其各敏感性特征,结果表明该地区敏感性特征除碱敏为弱至中等偏弱外,其余“四敏”都为无或弱敏感性特征。因此,在勘探开发过程中主要考虑储层的碱敏性。此外,通过对不同流速—渗透率关系曲线的研究,探明了速敏的形成机理。
The purpose of reservoir sensitivity evaluation is to study the mechanism of reservoir damage and provide a reliable basis for reservoir protection. The reservoirs in Zhanghan area of Ordos Basin are poor in physical properties and belong to the mesopore-low permeability to low porosity-ultra low permeability reservoirs. Starting with the sensitivity experiment, the sensitivity indices of different samples are measured to analyze and determine their sensitivity The results showed that the sensitivity characteristics of the area except the Alkalinity were weaker to moderately weaker, while the others were all weak or no sensitive features. Therefore, the basic sensitivity of the reservoir is mainly considered during exploration and development. In addition, through the study of different flow rate-permeability curves, the formation mechanism of speed-sensitive is proved.