基于模糊层次分析法的油藏渗吸潜力评价方法

An Evaluation Method of Imbibition Potential for Oil Reservoirs Based on Fuzzy Analytic Hierarchy Process

目前渗吸提高油藏采收率的方法已经广泛应用于裂缝性油藏、裂缝性低渗透油藏和低渗透油藏,并且起着越来越重要的作用。利用渗吸作用提高油藏采收率,需要对油藏进行适用性评价,确定油藏渗吸潜力。油藏存在多因素,需对其定量评价,在多种因素定量化的基础上综合研究这些参数的影响。引入最新的模糊层次分析法,对油藏渗吸潜力区块进行评价和筛选,对油藏毛管压力、润湿性、裂缝渗透率与基质渗透率比值等多因素影响效果进行综合评价,并通过W-R均值模型验证模糊层次分析法评价渗吸潜力区的正确性,对低渗透油田渗吸潜力评价具有一定的指导意义。

At present,the Imbibtion method for EOR has been widely applied in reservoirs with fractures and low permeability reservoirs with fractures and low permeability reservoirs and plays a more and more important role.Using imbibition to enhance oil recovery needs adaptability screening for reservoirs to determine the imbibition potential of reservoirs.There are many factors affecting a reservoir,so quantitative evaluation of a reservoir needs an overall study of those factors which should be quantified.By using the newly-appeared fuzzy analytical hierarchy process,the paper evaluates and screens the blocks that have imbimition potential;evaluates capillary pressure,wettability,the ratio of fracture permeability to matrix permeability and so on;and verifies the accuracy of the evaluation made by fuzzy analytical hierarchy process by using W-R mean value model.The method is significant to the evaluation of the imbibition potential for low permeability reservoirs.