| Citation: |
WENG Haijiao, ZHANG Shaohua, LIU Xin, ZANG Yahui, HE Hanghang, LU Tianjun. 2024. Study on reservoir structure and mineralization type of the sandstone uranium deposits, southern Songliao Basin. Geological Bulletin of China, 43(1): 117-130. doi: 10.12097/gbc.2022.05.013
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Study on reservoir structure and mineralization type of the sandstone uranium deposits, southern Songliao Basin
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Abstract
Exploring the sandstone-type uranium deposits in the DL area, located in the southern Songliao Basin, our research focuses on the sedimentological characterization, structure of the uranium reservoir and processes of uranium mineralization. Through drilling data statistics and systematic sampling analysis, a uranium reservoir heterogeneity map was drawn, which finely depicted the geometric shape and complex structure of the Yaojia Formation uranium reservoir, and fully demonstrated the quantitative heterogeneity of uranium reservoirs. The results show that the gray sand body primarily retains its original color, while the lower oxidation zone underwent modification by strong supergene fluid activity after the deposition, and transforming into an epigenetic oxidation zone. The ore bodies are mainly distributed in the bifurcation of the channel sand body, and along the edge of the channel sand body where the thickness transitions suddenly from no barrier layer to the presence of barrier layer, rather than in the center of the channel. Their plate-like shape is controlled by the redox interface. Comprehensive analysis shows that the mineralization of supergenetic fluids can be divided into two stages: the enrichment of the ore—bearing host rocks of the Yaojia Formation during the Late Cretaceous and the superimposed transformation of supergenetic fluids. By comparing the controlling effect of reservoir structure on uranium mineralization in DL area, three prospecting target areas were optimized in the BL area, providing a theoretical foundation for future exploration work.
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References
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WENG Haijiao, ZHANG Shaohua, LIU Xin, ZANG Yahui, HE Hanghang, LU Tianjun. 2024. Study on reservoir structure and mineralization type of the sandstone uranium deposits, southern Songliao Basin. Geological Bulletin of China, 43(1): 117-130. doi: 10.12097/gbc.2022.05.013
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Figure 1.
Schematic diagram of tectonic zoning in southwest Songliao Basin
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Figure 2.
Sedimentary facies map of Early Yaojia period in southern Songliao Basin
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Figure 3.
Sand body distribution characteristics of lower Yaojia Formation in DL area
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Figure 4.
Various barriers in sand bodies of lower Yaojia Formation in DL area
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Figure 5.
Profile of vertical 0 line in DL region
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Figure 6.
Contour maps of ratio of barrier layer to stratum thickness (a) and barrier layer thickness (b) of the 1st sublayers of lower Yaojia Formation in DL area
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Figure 7.
Contour maps of ratio of barrier layer to stratum thickness (a) and barrier layer thickness (b) of the 2nd sublayers of Yaojia Formation in DL area
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Figure 8.
Contour maps of gray sand body thickness (a) and gray sand body thickness (b) of the 1st and 2nd sublayers in the lower Yaojia Formation in DL area
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Figure 9.
Contour maps of oxidized sand body Fe2+/Fe3+ (a) and gray sand body Fe2+/Fe3+ (b) in the 1st sublayer of lower Yaojia Formation in DL area
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Figure 10.
Contour maps of oxidized sand body trace U (a) and gray sand body trace U (b) contents in the 1st sublayer of lower Yaojia Formation in DL area
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Figure 11.
Discriminant map of trace element ratio of lower Yaojia Formation in DL area
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Figure 12.
Development of epigenetic oxidation of lower Yaojia Formation in DL area
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Figure 13.
Borehole section of DL lot L8 line
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Figure 14.
Comparison of ore body morphology
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Figure 15.
Zoning model of supergene fluid mineralization in Yaojia Formation， southern Songliao Basin
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Figure 16.
Mineral prediction map of the 1st sublayer of lower Yaojia Formation in BL area