低电阻率油层的实验研究和解释方法

利用岩电实验手段,分析了华北油田赵县地区和文安地区影响油层电阻率高低的因素为束缚水饱和度,泥质含量,孔隙结构和阳离子交换量,各因素在不同地区作用的强烈程度不同,利用21块样品的核磁实验谱研究了解谱幅度和截止值与常规物性参数的规律,改进了核磁渗透率和束缚水饱和度的计算模型,利用张开角度法对曲线形态进行了量化描述,各种实验研究和方法研究都进行了实际应用分析。

Experiments and Interpretations of Low Resistivity Pay Zones

After the litho electric experiments on the low resistivity pay zones, we have figured out that factors influencing the resistivities of Zhaoxian and Wenan regions are the irreducible water saturation, shale content, pore structure and cation exchange capacity, each factor of which is quite differ in the two regions.On the basis of NMR experiments with 21 core samples, the law between peak amplitudes,cutoff values and petrophysical parameters is analysed, the interpretation models for NMR permeability and irreducccible water saturdtion are also improved. A curve angles estimation method is used to quantify the logs shapes.All experiments and methods are verified by practical applications.