青西油田窿六区块裂缝型储层流体性质判别

青西油田窿六区块下沟组裂缝型储层非均质性强、边底水突进严重,常规流体性质判别方法效果差.研究区储层基质物性差,电阻率较高;裂缝倾角以高角度为主,造成双侧向主要呈正差异.在此基础上建立储层分类标准,计算裂缝孔隙度,最终提出2种新的裂缝型储层流体性质判别方法:储层级别-深侧向电阻率交会法和裂缝孔隙度-深侧向电阻率交会法.这2种方法同时考虑了裂缝和流体性质对双侧向电阻率的影响,用来判别基质电阻率相对固定且裂缝倾角单一的裂缝型储层流体性质具有较好效果,研究区实际判别符合率均大于90%.

Identification of fluid property in the fractured reservoir in Long 6 Block,Qingxi Oilfield

Because of the strong heterogeneity and the serious bottom water and edge water breakthrough of the reservoir in the studied area,it is hard to determine the fluid properties of reservoir,and the conventional methods have poor identifying effect.The physical property of reservoir matrix is poor,and the resistivity of the reservoir matrix is high.High dip angle of fracture leads to the positive difference of dual lateral log.Based on these characteristics of the reservoir,a reservoir classification method is established and the porosity of fractures in the reservoir is calculated.Two fluid property identifying methods are put forward:the reservoir level-deep lateral resistivity cross-plot and the fracture porosity-deep lateral resistivity cross-plot.The effects of fracture and lateral resistivity are taken into account in two methods.They are suitable to determining the fluid property of fractured reservoirs with constant matrix resistivty and similar dip angle of fractures.The accuracy of the two methods is more than 90%.