反气相色谱对于储存岩石表面的特性分析：表面活性剂的作用

储存岩石的表面化学性质是理解岩石表面和其周围环境物理-化学性质的基本因素。反气相色谱表征了四个不同区块岩石的表面化学特征。借助于IGC-ID的技术，测定了样品在100度条件的表面分散能，纳米粗糙度，表面能相互作用等参数。并使用IGC-FC方法，用辛烷和异丙烷为探针，测定了吸附等温线和脱附性能。同时也得到了探针的BET比表面积和BET常数。

The description of the surface chemistry of reservoir rock is essential in understanding the physico-chemical interaction between the rock surface and its environment. In this study, inverse gaschromatography (IGC) is used to characterize the surface chemistry of rocks extracted from four petroleum reservoirs in Algeria. By means of IGC at infinite dilution (IGC-ID), the dispersive compo-nent of the surface energy ( sˆd), the nanomorphological index I M ( t) and the specific componentof the surface energy were determined at 100◦C. IGC at finite concentration (IGC-FC) was imple-mented using n-octane and isopropanol probes, allowing the irreversibility indexes and the adsorption isotherms to be obtained. From the latter, the BET specific surface area and BET constant of the injectedprobes were determined. Energy distribution functions and indexes of heterogeneity were also com-puted for the n-octane and isopropanol probes. The results showed that the polar probe, isopropanol,interacts more strongly with the rock surface than the apolar probe. In the second part of this study,the influence of a surfactant used in drilling mud on the heterogeneity of the surface energy was investigated. Different surfactant impregnation ratios were examined by means of IGC-FC. The results indicated that the progressive covering of the solid surface by the surfactant hid chemical functions likelyto interact with the injected probes and made the surface smooth by covering the roughness of the surface,which led to the decrease in all parameters obtained by IGC-CF.