Abstract
Organic matters, such as resinite, suberinite, OM (organic matter) reworked by bacteria, sulphur-rich OM, which have close relationship to the occurrence and accumulation of immature-low mature oils, were pyrolyzed by the GHM and PY-GC for studying the hydrocarbon generation characteristics and the relationship between the special types of OMs and the occurrence of immature-low mature oil. Meantime, some reference OMs are studied in the same way. The experimental results indicate that the OMs related to the occurrence of immature-low mature oil can start to generate hydrocarbon obviously under a relative lower thermal stress, while the temperature required for hydrocarbon generation of reference OMs is relatively high. Furthermore, it shows that the generation of immature-low mature oil may be mostly a chemical reaction process. The chemical kinetic analyse shows that the OMs related to immature-low mature oils have lower activation energies than that of conventional OMs, although the occurrence and accumulation of immature oil are related to various geological conditions and factors. The preliminary application of the chemical kinetic model shows that the representative OMs related to the immature oils do start to generate a certain number of hydrocarbons in a shallower depth than that of hydrocarbon generation threshold for the conventional OMs.
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