Thermogravimetric characteristics and its influencing factors of oil shales in Middle Permian Lucaogou Formation in Santanghu Basin,NW China
In order to study the thermogravimetric characteristics,pyrolysis process and its influencing factors of oil shales during heating,the oil yield,total organic carbon,pyrolysis,major elements and thermogravimetric analysis of oil shales from the Lucaogou Formation in Santanghu Basin were tested.The results show that oil shales from the Lucaogou Formation in Santanghu Basin are medium quality oil shales with high organic matter abun-dances,high ash contents and medium calorific values.The main elements of ashes are SiO2,Al2O3 and CaO,which belong to high melting ashes.Thermogravimetric analysis of oil shale shows that the pyrolysis process is mainly divided into three stages,including low temperature,medium temperature and high temperature weight loss stages.The medium temperature weight loss stage is the main weight loss stage and pyrolysis reaction stage of oil shales,with the temperature of 300-580 ℃.Among them,the temperature of large amount of oil and gas genera-tion stage in oil shale pyrolysis process is 430-500 ℃,which is the key stage of oil generation.While 500-580 ℃ is the gas generation stage,which can form a certain amount of shale gas.
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