碳封存条件岩石润湿性测量方法及其对气—液界面影响机理的研究进展

Progress in the study of porous surface wettability of rocks and its influence on gas-liquid interface under CO_(2)sequestration conditions

CO_(2)地质封存是实现温室气体深度减排的重要方法,岩石润湿性是影响其安全性与储存潜能的关键因素之一,因此探明岩石多孔壁面的润湿规律及其对CO_(2)-盐水界面迁移的影响机理,有助于推动碳封存项目规模化实施.本文简要综述了近年来碳封存领域多孔介质壁面润湿性测量的研究进展,归纳了多孔介质壁面润湿性对气-液界面运移微观影响机理的最新成果.从目前的研究来看,应用微流控芯片和X射线CT可视化技术成为研究孔隙壁面润湿性的重要手段,多孔介质壁面接触角测量已从传统岩心表面接触角转变岩心内部多孔壁面局部接触角测量研究,研究获得了基于气-液界面特性与局部润湿行为的岩心整体润湿性评价方法.但如何建立不同尺度润湿特性之间的联系关系目前仍面临挑战.另一方面,业内学者在孔隙尺度获得了不同润湿条件下CO_(2)-盐水界面演变特性,随着更多微观渗流机理的发现,岩石润湿性对不同气-液界面行为的影响机理还需大量工作.

The implementation of CO_(2)geological storage is an important method to achieve deep greenhouse gas emission reduction.Its storage potential and safety are significantly influenced by the wettability of the reservoir porous media.It is necessary to clarify the wettability pattern of the porous surface of rocks and its influence on the CO_(2)-brine interface migration,promoting the large-scale implementation of carbon sequestration projects.In this paper,we briefly review the recent progress of research on the wettability measurement of porous media in the field of CO_(2)geological storage and summarise the latest research results on the microscopic influence of porous surface wettability on gas-liquid transport in porous media.From the current research,the application of microfluidic chip and X-ray CT visualization technology has become an important means to study the wettability of porous surface.The contact angle measurement of porous media has changed from the traditional core surface contact angle measurement to the local contact angle measurement at pore scale.Domestic and foreign scholars have developed the overall core wettability evaluation methods based on gas-liquid interface characteristics and local wettability behaviour.However,how to establish the relationship between wetting characteristics at different scales is still a challenge.On the other hand,scholars have studied the characteristics of the CO_(2)-brine interface under different wetting conditions at the pore scale.With the discovery of more microscopic seepage mechanisms,the influence of rock wettability on different behaviours of gas-liquid interfaces still needs a lot of work.