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有机质在遭受氧化作用后 ,其元素的组成比例、最高热解峰温、生烃转化率及镜质体反射率均发生了较大的变化 ,常规判识有机质演化程度的指标已失去意义。松辽盆地东南隆起区的研究结果表明 :有机质在遭受氧化作用影响后 ,干酪根元素的O/C比随演化程度的加深而迅速降低 ,致使其反映的演化程度高于实际值 ;有机质氧化后 ,导致Tmax增高 ;经过氧化的有机质在相同的热力条件下 ,具有较高的转化率 ;在强氧化作用下形成的镜质体 ,其反射率值比正常情况下增长大 ,强还原环境下则减小。因此 ,在研究松辽盆地东南隆起区的有机质演化 ,特别是营城组的演化时 ,不能以某一指标而定论。
After being oxidized, the composition of organic matter, the highest pyrolysis peak temperature, the hydrocarbon conversion rate and the vitrinite reflectance all changed greatly. It is no longer meaningful to judge the evolution degree of organic matter by conventional methods. The results show that the O / C ratio of kerogen elements decreases rapidly with the deepening of the degree of evolution after being affected by the oxidation of organic matter, resulting in the degree of evolution reflecting higher than the actual value. After oxidation of organic matter , Resulting in an increase in Tmax; the oxidized organic matter has a higher conversion under the same thermal conditions; the vitrinite formed under strong oxidation has a greater increase in reflectance than normal and a strong reduction environment Decrease Therefore, when studying the evolution of organic matter in the southeast uplifted area of Songliao basin, especially the evolution of Yingcheng Formation, it can not be determined by a certain index.