Table 3 Organic petrographical analysis result of Da’anzhai shale.
Submember | Depth (m) | Sapropelite (%) | Exinite (%) | Vitrinite (%) | Inertinite (%) | Type index |
|---|---|---|---|---|---|---|
Upper | 2877.26 | 0 | 28 | 64 | 8 | − 42.0 |
2880.96 | 0 | 28 | 62 | 10 | − 42.5 | |
2883.80 | 0 | 32 | 60 | 8 | − 37.0 | |
2896.49 | 0 | 64 | 30 | 6 | 3.5 | |
Middle | 2905.12 | 0 | 64 | 30 | 6 | 3.5 |
2909.55 | 0 | 70 | 25 | 5 | 11.3 | |
2914.63 | 0 | 53 | 38 | 6 | − 6.5 | |
2916.82 | 0 | 42 | 50 | 8 | − 24.5 | |
2918.66 | 0 | 40 | 53 | 7 | − 26.8 | |
2921.80 | 0 | 65 | 28 | 7 | 4.5 | |
2926.84 | 0 | 70 | 26 | 4 | 11.5 | |
2930.31 | 0 | 62 | 32 | 6 | 1.0 | |
2933.99 | 0 | 64 | 31 | 5 | 3.8 | |
2937.65 | 0 | 40 | 52 | 8 | − 27.0 | |
2941.55 | 0 | 28 | 64 | 8 | − 42.0 | |
2943.32 | 0 | 55 | 39 | 6 | − 7.8 | |
2945.65 | 0 | 40 | 54 | 6 | − 26.5 | |
2946.04 | 0 | 38 | 54 | 8 | − 29.5 | |
2947.24 | 0 | 35 | 55 | 10 | − 33.8 | |
Lower | 2950.53 | 0 | 62 | 34 | 4 | 1.5 |
