原油乳状液对原油的长距离输运具有重要影响，乳状液的油、水状态及相互作用机制还需新理论和新方法获得新认识，基于有效介质理论，本文研究了原油乳状液太赫兹光谱响应特征. 通过太赫兹时域光谱系统测试得到了含水率为 0 ～ 28 % 的原油乳状液的太赫兹时域光谱，结合傅里叶变换计算了吸收系数和介电常数等光学参数，同一频率下吸收系数等光学参数随含水率增加而增大. 样品的实际介电常数与 Bruggeman 理论计算的介电常数一致，最大误差率低于 3 % ，说明含水率较小时，水分散在原油中，微粒间的距离较大，微粒间的相互作用力较小，随着含水率增加，水相和油相混合分布，微粒间的距离会变小，微粒的相互作用力会变大. 因此，有效介质理论对乳状液的太赫兹光谱研究具有重要意义.

Crude oil emulsions have an important influence on the long-distance transportation of crude oil. The oil and water state of the emulsion and the interaction mechanism require new theories and new methods. The terahertz spectrum ( THz- TDS) response of

crude oil emulsion is studied based on the effective medium theory. The THz-TDS of emulsions with water content of 0 ～ 28 % are obtained by using the THz-TDS system. The optical parameters such as absorption coefficient and dielectric constant are calculated by

Fourier transform. The optical parameters increase with the increase of water content of emulsions. The actual dielectric constant is consistent with the dielectric constant calculated by Bruggeman's theory，and the maximum error rate is less than 3 % . The results show that when the

water content is small，the water is dispersed in the crude oil，the distance between the particles is large，and the interaction force between the particles is small. As the water content increases，the water phase and the oil phase are mixed and distributed，the distance between the

particles will become smaller，and the inter- action force of the particles will become larger.Therefore，the effective medium theory is significant to investigate the THz spectrum of oil-water emulsions.