Abstract Petroleum and petroleum products characterization are vital for decision-making in the oil industry. Electrical properties have been used for quality, safety control, indirect characterization and investigation of some physicochemical properties of petroleum and by-products. In this study, a heavy and a medium oil, labeled as alpha and beta, respectively, their distillation products and water-in-oil (W/O) emulsions were characterized by impedance spectroscopy to obtain electrical conductivity and dielectric constant at 30 and 50 °C. The results were used to propose one among many ways in which electrical properties can be used to predict other non-electrical physical properties in the field. We obtained kerosene cut (KC), diesel cut (diesel) and atmospheric residue (RAT) after distillation of the oils. The blends KC/oil, diesel/oil and KC/RAT were synthesized to investigate the effect of viscosity increase and addition of polar compounds to the conductivity and dielectric constant of these cuts. We synthesized W/O emulsions containing 10, 30 and 50% w/w of saline water. The Nyquist diagrams for the oil samples, cuts and blends presented only a single semicircle. For emulsions, two semicircles were observed, one attributed to the oil phase and the other to the emulsion phase. It was observed that an increase in temperature was followed by an increase in electrical conductivity and a decrease in dielectric constant for all samples. The highest values of electrical conductivity and dielectric constant were observed for the alpha oil, which has higher viscosity and polar compounds than beta oil. For KC, diesel and RAT cuts, it was observed that electrical conductivity decreases and the dielectric constant increases for higher boiling range cuts (KC

中文翻译：

---

电化学阻抗谱研究巴西中重原油的电学特性

摘要 石油和石油产品的表征对于石油工业的决策至关重要。电气特性已被用于质量、安全控制、间接表征和石油和副产品的一些物理化学特性的研究。在这项研究中，分别标记为 α 和 β 的重油和中油，其蒸馏产物和油包水 (W/O) 乳液通过阻抗谱表征，以获得 30 和 50 的电导率和介电常数℃。结果用于提出多种方法中的一种，在这些方法中，电特性可用于预测该领域的其他非电物理特性。我们在蒸馏油后获得煤油馏分 (KC)、柴油馏分（柴油）和常压渣油 (RAT)。混合 KC/油，合成柴油/油和 KC/RAT 以研究粘度增加和添加极性化合物对这些馏分的电导率和介电常数的影响。我们合成了含有 10%、30% 和 50% w/w 盐水的 W/O 乳液。油样、切割和混合物的奈奎斯特图仅显示一个半圆。对于乳液，观察到两个半圆，一个归因于油相，另一个归因于乳液相。观察到温度升高后所有样品的电导率增加和介电常数降低。α 油的电导率和介电常数最高，它比 β 油具有更高的粘度和极性化合物。对于 KC、柴油和 RAT 削减，