In heavy oil, not only the absolute concentrations but also the ratio indicators of neutralnitrogen compounds are too low to distinguish the oil migration path.
重质油中，无论是中性含氮化合物的绝对浓度或是其比值指标都降低，严重影响了原油运移途径的判别。
2
Preserved liver, kidney, pancreas, adipose tissue in liquid nitrogen, and collected the liver, pancreas to 10%neutral formalin-fixed.