摘要
通过37块中低孔渗砂岩样品的水驱油岩电实验结果得出,当注入水矿化度与原始地层水矿化度相差越大时,电阻率与含水饱和度呈"U"型变化特征越明显;反之,电阻率与含水饱和度的"U"型变化幅度越小,电阻率随含水饱和度增加而单调递减的趋势越明显。另外温度、压力以及孔隙结构都对电阻率随含水饱和度变化有很大的影响。根据研究地区的实验结果,分别确定了地层条件下不同注入水矿化度下的含水饱和度模型以及相应"U"型变化中拐点含水饱和度的模型。通过实际处理的井和产液剖面资料对比分析,得出水驱油实验建立的饱和度模型相比传统阿尔奇公式计算的结果更接近实际情况。该方法可以有效地提高定量评价的精度,为实现油田开发中后期水淹层定量分级和精细评价提供可靠的技术支持。
It is concluded by the rock- resistivity experiments of water flooding of 37 sandstone cores with medium-low porosity and permeability that the greater difference between the salinities of the injected and original formation water is,the more obvious the ＂U＂type characteristic of resistivity and water saturation is. But conversely,the smaller the variation in ＂U＂type characteristic is,the more obvious the decreasing trend of resistivity with the increasing resistivity is. In addition,temperature,pressure and pore structure have great influences on the resistivity changes with water saturation.Based on experimental results,the water saturation model of different injected water salinities under formation conditions and the corresponding water saturation model of inflection point in ＂U＂type were separately identified. Through comparison and analysis between the data from several processed wells and data of producing liquid section,it is concluded that the model established from water displacing oil experiment was more practical than the results from Archie equation.
出处
《复杂油气藏》
2015年第1期57-61,共5页
Complex Hydrocarbon Reservoirs
关键词
岩电实验
水驱油
含水饱和度
中低孔渗储层
rock-resistivity experiment
water displacing oil
water saturation
medium-low porosity and permeabili-ty reservoir
