轻油、稠油、水样核磁共振试验结果及其横向分布特征

Result of NMR Measurement and T_2 Distribution Properties of Light/Heavy Oil and Water Samples

不同性质流体的横向弛豫特性研究是了解岩石弛豫机理的一个重要方面。设计了轻油、稠油、水样共7个样品在不同温度下、不同极化时间下核磁共振试验,展示了横向弛豫T2分布特征,讨论了温度、粘度与T2的关系。在室温下,轻质油样与水样呈高陡对称单峰T2分布;高粘度油样的T2分布基本呈对称或近似对称的单峰形态;中等粘度油样会呈现双峰T2分布,且展布更宽。温度会改变稠油样的T2时间与T2分布的形态,表现为温度上升,T2时间增大,展布更宽。稠油样的粘度、温度与T2呈现较好的相关关系。

The transverse relaxation characteristics of fluids with different properties were one of the important aspects of studying transverse rock relaxation.Rock physical experiments for comprehensive NMR properties were designed including 7 light oil,heavy crude oil and water samples under different temperatures and different polarization times,T 2 distributions of these samples under different conditions were obtained.The relationship between temperature,viscosity and T2 was discussed.Under the ambient temperature,the light oil and water samples present the high steep and symmetrical single peak T2 distribution,the T2 distribution expands narrowly;High viscosity oil sample T2 distribution basically present symmetrical or the approximate symmetrical single peak shape;and the partial medium viscosity oil sample present the split-blip T2 distribution,moreover,the T2 distribution expands wider than the other samples.Along with the temperature increase,T2 time of heavy oil sample increases obviously,the T2 distribution also changes widely.The viscosity,temperature and T2 present better relations of heavy oil sample.