在对国内外文献详尽检索研究基础上，根据对国内９个二级沉积凹陷和５个中、小型盆地的有机地球化学、有机岩石学和同位素地球化学的系统研究，作者建立了木栓质体、树脂体、细菌改造的陆源有机质、藻类与高等植物生物类脂物以及富硫大分子（非烃、沥青质和干酪根）等五种早期生烃形成低熟油的成因机制 Based on exhaustive research on domestic and foreign literature, based on systematic studies on organic geochemistry, organic petrology and isotope geochemistry in nine secondary sedimentary basins and five medium and small basins in China, , Resin body, bacteria-modified terrigenous organic matter, algae and higher plant biological lipids, and five sulfur-rich macromolecules (non-hydrocarbons, asphaltenes and kerogen)