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在胜利减压渣油热反应体系中，随着热处理时间的延长，依次出现了3个可为光学显微镜所检测和辨识的特征状态点。分析结果表明：第一个特征状态点与渣油胶体体系丧失动力学稳定性后原生沥青质的聚集和分相有关，它决定着体系的生焦诱导期；第三个特征状态点与体系中次生沥青质的浓度高达相分离的临界状态相对应，它决定着开始大量生焦的时刻。据此认为，光学显微镜法在实验室条件下预报渣油热反应体系物理化学状态的突变特性是可行的，且有可能在工业上应用。
In the thermal reaction system of Shengli vacuum residue, with the extension of heat treatment time, there are three characteristic state points which can be detected and identified by optical microscope. The results show that the first characteristic state point is related to the accumulation and separation of primary asphaltene after the loss of kinetic stability of the residue colloidal system, which determines the coke induction period of the system. The third characteristic state point and the system The concentration of secondary asphaltenes corresponds to the critical phase of phase separation, which determines the moment when large amounts of coke are started. Therefore, it is feasible to predict the abrupt change of physico-chemical state of the residue-oil thermal reaction system under the optical microscope under laboratory conditions, and it is possible to apply it in industry.