Pyrolysis of lignite was conducted at high temperatures from 400 ℃ to 700 ℃ and high pressures from 1 GPa to 3 GPa in a closed system in order to investigate pressure and temperature effects on organic matter maturation.It was indicated that terpane showed more mature characteristics with increasing temperature at a given pressure.Conversely,high pressure significantly hindered the thermal evolution of geological organic matter.During diagenesis,compared with the addition reaction of double bonds of alkene,...
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