Abstract: The adsorption of asphaltene and resin on quartz sands makes the surface property of the quartz sands transfer from strong water-wet to oil-wet.But the transferring effect is not a function of the concentrations of asphaltene and resin.The oleophilic-site density on rock's surface can be quantified by measuring the concentration difference of heptanol solution,namely measuring the difference between the initial concentration of heptanol solution and the balance concentration due to adsorption on the surface of rock.Quantifying the oil-wet percent of rock's surface can reflect the change of the wettability perfectly.Experimental results show that the heptanol method is realizable to quantify the oil-wet percent.

Key words: asphaltene, resin, adsorption, quartz sands, heptanol method, wettability, oil-wet

摘要： 沥青质和胶质在石英砂上的吸附使得石英砂表面由强亲水向油湿方向转化,但这种转化作用与沥青、胶质浓度不成正比.定量确定岩石表面的亲油百分数能够更客观、更形象、更具体地反映由于岩石吸附原油中的重质终馏分(沥青质)和极性部分(胶质)之后润湿性的变化.通过记录正庚醇水溶液在岩石上吸附前后的浓度差来定量测定岩石表面上憎水位置密度,进而求算出亲油百分数.实验结果表明,利用正庚醇法测定岩石亲油百分数是可行的,是值得推广的一种方法.

关键词: 沥青质, 胶质, 吸附, 石英砂, 正庚醇法, 润湿性, 亲油