摘要
对于低矿化度地层水、粗细颗粒混杂、无统一油水界面的砂泥岩地层,常规测井解释方法已无法解决储集层的评价问题。本文针对这个问题提出以岩心分析资料为基础,应用统计方法寻求岩性、物性、含油性与测井响应的关系,确定地层孔隙度、渗透率、泥质含量、束缚水饱和度等地质参数。在此基础上,给出使用粒度中值判别岩石颗粒大小,采用可变胶结指数和正确选取地层水电阻率计算储集层合理的含油饱和度的方法,为复杂砂岩储集层评价提供了新的测井解释技术。
Conventional log interpretation methods encounter many difficulties inreservoir evaluation to sand-shale formations with low formation water sa-linity, mixed grain size and inconsistent oil-water interface. This paper de-scribes a newly developed log interpretation technique for evaluation of com-plex sandstone reservoirs. This method based on core analysis relates logrespotises to lithology, petrophysical properties and oil possibilities by usingstatistic method. Some geological parameters, such as porosity, permeability,volume of shale and irreducible water saturation etc, were determined. Onthe basis above, a method for calculating reasonable oil saturation byproperty choosing the medium value of grain size, the variable cementationindex and the precise formation water resistivity is presented.
