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Outline
Gamma logging is the fundamental method for quantitatively determining uranium content of mineralized intervals in boreholes. The U-Ra equilibrium in a certain sandstone-hosted uranium deposit has been severely disrupted. To investigate the impact of Ra-rich sections (mineralized intervals where the equivalent uranium grade derived from radium is ≥ 0.010 0% but the uranium grade is<0.010 0%) on log interpretation and U-Ra equilibrium correction results, the uranium and radium content analysis results of permeable ore samples were systematically studied. The results show that: for samples with a uranium grade≥0.010 0%, the weighted average uranium grade is 0.042 7 %, the weighted average U-Ra equilibrium coefficient is 0.615, and the coefficient of variation is 1.041; for samples with an equivalent uranium grade derived from radium≥0.010 0%, the weighted average uranium grade is 0.029 5%, the weighted average U-Ra equilibrium coefficient is 0.890, and the coefficient of variation is 3.785. Ra-rich sections will significantly increase the deposit's U-Ra equilibrium coefficient, increase the orebody thickness, and decrease the deposit's uranium grade. Gamma logging cannot identify and remove Ra-rich sections. Consequently, neither the log interpretation results nor the U-Ra equilibrium correction results objectively reflect the orebody's spatial position, grade and thickness. The estimated resource quantity is also inaccurate.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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