基于常规测井资料的油层润湿性评价

Evaluation of reservoir wettability by means of conventional logging data

润湿性是油层的基本特性之一,控制多相流体在岩石中的微观分布状态及流动特征,对提高原油采收率有重要影响.以岩心实验为基础,根据毛细管拉普拉斯方程,实现油层润湿性的连续、快速、定量评价.处理实际测井资料并与实验结果对比,计算的润湿角余弦与相对润湿指数的相对误差均小于24.50%.该方法可以有效连续定量评价油藏储层的润湿性,拓展测井资料的应用范围,对测井解释技术的发展具有一定的理论意义.

Wettability is one of the characteristics of oil reservoir,which controls the microcosmic distribution and flow of the multi-phase fluids in the porous rocks.Therefore,it has an important effect on oil recovery enhancing.Based on measuring rock core in lab and started from Laplace equation of capillary,This thesis presents the method of evaluating reservoir wettability using conventional logging data,which realizes continuous,quick and quantitative evaluation of reservoir wettability accordingly.Comparing the results from processing logs in this method with those from measuring core shows that the relative errors between the cosine of wettability angle calculated and relative wettability index measured are all less than 24.50%.It proves that the method can evaluate reservoir wettability effectively,continuously and quantitatively.,it is hence highly applicable.At the same time the method has academic significance for the development of logging interpretation technique to some extent as a result of its expanding applied scopes of logging.