高邮凹陷低渗透砂岩储层含油饱和度确定方法研究

基于储层岩性、物性、孔隙结构以及油藏的油柱高度等因素的分析,高邮凹陷低渗透砂岩储层的含油饱和度主要受储层物性差、油柱高度低影响。利用毛管压力曲线特征将阜宁组阜三段、阜二段和阜一段低渗透储层分为4类,建立了不同类型储层的岩电参数,并发现岩电参数m和n值随胶结物成份和储层物性变化具有不同的规律。在确定低渗透储层的含油饱和度时,需要综合利用岩心直接分析结果、毛管压力曲线的J(Sw)函数法和沃尔法、以及基于不同类型储层岩电参数的测井解释方法。

Study on a determination method of oil saturation of low-permeable sandstone reservoir,Gaoyou Sag

Based on analysis of lithology,properties,pore structure,oil column height,oil saturation of low-permeable sandstone reservoir is mainly influenced by low porosity and permeability,and low oil column height.Four types of the 3rd and 2nd member of Funing Formation are classified by capillary pressure curves.And then it was obtained rock-electrical parameters,m and n,for each type reservoir,which are affected by component and volume of cemented material,porosity,and permeability.Some methods,which include direct analysis of cores,the capillary pressure curve（J（Sw） and Woll）,logging interpretation with relevant m and n values for various type reservoirs,are used to determine the oil saturation.