《Table 3 Comparison of parameters of the shale oil in different basins》

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《"Characteristics and Evaluation of the High-Quality Source Rocks of Cretaceous Continental Shale Oil in Tonghua Basin, China"》

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The test results showed that the TOC values of the highquality source rocks were between 1.51%and 5.44%，and the average was 2.69%.The original hydrocarbongenerative potential values（S1+S2）were 0.18–6.13 mg/g with an average of 3.23 mg/g.The Ro value was 0.97%–1.40%，with an average of 1.10%，representing source rocks in the mature or highly mature stage（Gao et al.，2018）.Compared with similar shale oil in other basins，the parameters of the high-quality source rocks in the Hengtongshan Formation are approximate（Table 3）（Jing et al.，2014；Liu Bo et al.，2014；Gao et al.，2017；Li Shizhen et al.，2017） .The plot of pyrolysis Tmax vs.production index（PI）shows source rocks in the main stage of hydrocarbon generation（Liu et al.，2018）（Fig.6） .The relative content of saturated hydrocarbon fractions is dominant in the high-quality source rocks.The ratio of saturated hydrocarbons to aromatic hydrocarbons is 1.55–5.24，with an average of 2.85，which is greater than 1.6.The organic matter type is mainly composed of humicsapropelic kerogen（II1），followed by sapropelic kerogen（I）（Table 4）（Liu Zhaojun et al.，2009）.The carbon isotopic values（δ13C）of the kerogen in the high-quality source rocks are-26.53‰–-34.75‰，with an average of-29.94‰.The organic matter types are mainly kerogen type II1 followed by kerogen type I based on the kerogenδ13C classification standard of organic matter types（I:-35‰–-30‰，II1:-30‰–-27.5‰，II2:-27.5‰–-25‰，III:>-25‰）given by Huang Jizhong et al.（1988）and Chen Mengjin et al.（2007）.These results are consistent with the conclusions of the rock pyrolysis analysis（Fig.7）.（Liu Chunlian et al.，2010；Sun et al.，2014；Gajica et al.，2017；Abarghani et al.，2018）.