《Table 2 The evaluation criterion of source rocks in the Hengtongshan Formation, Tonghua Basin》

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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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High-quality source rocks usually feature high contents of certain organic matter types and have medium or high maturities.Different scholars follow different classification standards for high-quality source rocks（Table 2）（Peters，1986；Jarvie，1991；Zheng Hongju et al.，2007；Pang Xiongqi et al.，2009；Chen Jianping et al.，2012） .The lower limit of the total organic carbon（TOC）values of the high-quality source rocks was determined using the method developed by Wang Zhensheng（2014），which improved upon the plot method of Lu Shuangfang（2012）.The lower-limit TOC value was assigned to the inflection point in the curve between the chloroform bitumen“A”content and the TOC value at which further increases in the TOC value do not produce significan increases in the chloroform bitumen“A”content.