由于石油的主要成分包括饱和烃、芳香烃类化合物、沥青质、树脂类等，这些物质难以降解，并且对水生生物有毒杀作用。
The main components of oil are saturated hydrocarbons, aromatic compounds, asphaltenes, resins, and so on. It is difficult to degrade these substances which are bad for aquatic life.
志留系沥青砂岩的成岩作用特征等资料证明，沥青砂岩的形成是烃类多期次注入的结果。
Diagenesis data indicate that the Silurian asphaltic sandstones are the products of multiple fillings of hydrocarbon.
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