When crude oil viscosity is low, T1 approaches T2 , and the inverse relation of the relaxation time and viscosity, the ratio of viscosity to temperature in double logarithmic coordinate was obtained.

• 低粘度原油的纵向弛豫时间T1和横向弛豫时间T2近似相等,且在双对数坐标系下与粘度、粘度与温度比值呈反比关系;