摘要
为了探索复电阻率测井的可行性，利用模拟岩心所处地层条件下的不同矿化度地层水对岩心样品进行完全饱和，油驱水至束缚水，再进行聚合物驱。实验过程中仪器采用宽频带扫频测量，不断改变测量频率，记录不同频率下岩心复电阻率的实部数值、虚部数值；分析孔隙流体性质及含量变化和测量频率变化对泥质砂岩频散特性的影响。实验结果表明，含油饱和度相同、低频时复电阻率实部、模值受溶液矿化度的影响，而虚部几乎不受矿化度的影响。当注入水与原始地层水电阻率比值小于2．2时，复电阻率模值、模的差值、虚部与含水饱和度有着很好的函数关系，可用来评价含油性。
In order to study the feasibility of complex resistivity, experiment is carried out by using formation water with different salinity under formation condition to simulate cores through fully saturated, oil displacing water to irreducable water, and then polymer flooding. During the experiment, instrument performs broadband frequency sweep measurement, and continuously changes measurement frequency and records real part and imaginary part nu- meric values. Effects of pore fluid property, contents variety and measurement frequency variety on frequency dispersion of argillaceous sandstone are analyzed. Results show that, with same oil saturation and low frequency, complex resistivity real part and module value are influenced by solution salinity, and imaginary part is almost not influenced by salinity. When the resistivity ratio value between injection water and original formation water is less than 2.2, complex resistivity module value, differential module value and imaginary part have better functional relationship with water saturation and can be used to evaluate oil bearing property.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2010年第2期138-142,共5页
Petroleum Geology & Oilfield Development in Daqing
关键词
复电阻率
频散特性
聚合物驱
complex resistivity
dispersion property
polymer flooding
