Abstract: On the basis of present methods to determine diffusion-absorption property of shale formation,long-core resistivity experimental apparatus has been introduced to study the diffusion-absorption ability of shale formation when exposed to various aqueous solutions.The computer program has been established for using radial resistivity distribution to determine the diffusion-absorption coefficient and the distribution of water content.Theoretical analysis indicates that this method not only reflects the diffusion-absorption performance of formation perfectly,but also provides a fundamental idea to evaluate the hydration ability and hydration state of watersensitive formation in the field.

Key words: resistivity, diffusion-absorption, shale, diffusion-absorption coefficient, filtrate invasion

摘要： 扩散吸附性是泥岩页地层与外来流体接触时呈现出的基本物理性质,扩散吸附系数则是表征这种能力的基本物理量,是研究泥页岩地层水化能力、水化程度及泥浆抑制性的重要参数.在分析泥页岩地层扩散吸附性现有方法的基础上,利用长岩心岩电实验装置,对泥页岩地层与三种不同水溶液接触时呈现出的扩散吸附能力进行了研究,并建立了根据电阻率径向分布规律确定地层/泥浆组成体系扩散吸附系数及井眼围岩吸附水分布的方法和计算机程序.理论分析表明,该方法不仅能够较好地反映地层的扩散吸附性,而且有助于利用现场测井资料评价水敏性泥页岩地层水化能力及水化程度.

关键词: 电阻率, 扩散吸附, 泥页岩, 扩散吸附系数, 滤液侵入