评价参数 | I1 | I2 | II | III1 | III2 | ||
好 | 较好 | 中等 | 较差 | 差 | |||
干酪根 | 镜质 | 壳质组 | >90 | 70~90 | 50~70 | 30~50 | <30 |
镜质组 | <10 | 10~20 | 20~30 | 30~80 | 80~90 | ||
TI | 60~100 | 40~60 | 20~40 | (−10)~20 | (−100)~(−10) | ||
元素 | H/C | >1.4 | 1.4~1.2 | 1.2~1.0 | 0.8~1 | <0.8 | |
O/C | <0.1 | 0.1~0.15 | 0.15~0.2 | 0.2~0.25 | >0.25 | ||
热失重总失重率% | >70 | 60~70 | 40~60 | 30~40 | <30 | ||
红外光谱 | 2920 cm−1/1600 cm−1 | >4.3 | 2.7~4.3 | 1.6~2.7 | 0.5~1.6 | <0.5 | |
1460 cm−1/1600 cm−1 | >1.0 | 0.75~1.0 | 0.5~0.75 | 0.15~0.5 | <0.15 | ||
碳同位素,% | <−30 | (−30)~(−28) | (−28)~(−25.5) | (−25.5)~(−22.5) | >−22.5 |