复电阻率法(CR)在江汉油田剩余油检测中的应用

On Application of Complex Resistivity(CR)in Surplus Oil Detection in Jianghan Oilfield

复电阻率法是利用油气藏与围岩间的激发极化差异来直接寻找油气藏的方法。其野外采集布设观测系统包括发射部分和接收机等。复电阻率法资料处理的关键是如何分离激电谱和电磁谱。该方法在江汉油田某油区一条测线的测量试验,反演出该剖面的极化率分布和电阻率分布,高极化率异常非常明显,高极化率的异常与中高电阻率异常对应较好。复电阻率法对剩余油存在的位置和剩余油分布形态有较好的反映。

Complex resistivity （CR） is used to look for hydrocarbon reservoir by means of the difference of induced polarization between the reservoir and surrounding rock. Its recording geometry consists of transmitter and receiver. How to separate IP spectrum with electromagnetic one is the focus of data process obtained from CR. Applied to measurement test of a survey line of some oil zone in Jianghan oilfield, CR method inverts this sectional distribution of polarizability and resistivity, showing that high polarizability is abnormal obviously and its exception corresponds to that of medium to high resistivity preferably. CR method can reflect better the position of remaining oil as well as its distribution pattern.