评价指标 | 好 | 较好 | 中等 | 较差 | 差 | |
有机碳含量,% | 淡水–半咸水 | >2 | 1.5~2 | 1.0~1.5 | 0.4~1.0 | <0.4 |
咸水–超咸水 | >0.8 | 0.6~0.8 | 0.4~0.6 | 0.2~0.4 | <0.2 | |
氯仿沥青“A”,% | >0.15 | 0.10~0.15 | 0.05~0.10 | 0.015~0.05 | <0.015 | |
HC,% | >0.10 | 0.07~0.1 | 0.04~0.07 | 0.01~0.04 | <0.01 | |
S1 + S2,mg/g | >8 | 6~8 | 4~6 | 2~4 | <2 | |
IH,mg/g,HC/TOC | >500 | 350~500 | 200~350 | 50~200 | <50 |