| 层位 | 编号 | 矿物组成(%) |
| 黏土组成(%) | ||||||
| 硅质 矿物 | 碳酸盐岩 矿物 | 黏土 矿物 | 其他 |
| 伊利石 | 高岭石 | 绿泥石 | 伊/蒙 混层 | ||
| 龙潭组 | A-1 | 18.0 | 0 | 75.0 | 7.0 | 0 | 4.0 | 4.0 | 92.0 | |
| A-2 | 20.0 | 9.0 | 66.0 | 5.0 | 0 | 6.0 | 10.0 | 84.0 | ||
| A-3 | 14.0 | 0 | 75.0 | 11.0 | 3.0 | 30.0 | 20.0 | 47.0 | ||
| A-4 | 25.0 | 3.0 | 63.0 | 9.0 | 1.0 | 42.0 | 30.0 | 27.0 | ||
| A-5 | 15.0 | 0 | 56.0 | 29.0 | 1.0 | 35.0 | 30.0 | 34.0 | ||
| A-6 | 33.0 | 1.0 | 62.0 | 4.0 | 0 | 10.0 | 13.0 | 77.0 | ||
| 吴家坪组 | B-1 | 40.0 | 46.5 | 8.7 | 5.0 | 100.0 | / | 0 | 0 | |
| B-2 | 38.0 | 54.6 | 5.2 | 2.0 | 99.0 | / | 1.0 | 0 | ||
| B-3 | 54.0 | 34.7 | 5.6 | 6.0 | 99.0 | / | 1.0 | 0 | ||
| B-4 | 34.0 | 43.5 | 15.6 | 8.0 | 96.0 | / | 4.0 | 0 | ||
| B-5 | 45.0 | 20.1 | 27.4 | 8.0 | 94.0 | / | 6.0 | 0 | ||
| B-6 | 65.0 | 13.3 | 14.4 | 8.0 | 97.0 | / | 3.0 | 0 | ||