Sequence stratigraphic frameworks in different scales and sandstone-type uranium ore-formation of Minghuazhen Formation in Dagang area, Bohai Bay Basin
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摘要:
渤海湾盆地位于世界两大砂岩型铀矿成矿带之一的欧亚成矿带内, 具有砂岩型铀成矿的潜力。大港探区测井结果显示明化镇组发育着大范围的高伽马异常, 为探究其铀成矿条件并指明找矿方向, 建立了大港探区明化镇组多级别层序格架, 并开展了层序内沉积微相研究, 对氧化还原带进行了划分。研究表明, 依据测井曲线特征和岩石性质, 将明化镇组划分为五级层序, 铀异常主要见于明化镇组下段上亚段和上段下亚段2个五级层序内。其沉积微相主要发育曲流河河道、边滩、溢岸沉积和泛滥平原4种, 其中铀异常主要发育于边滩、河道砂体。2个层序内的氧化还原带可划分出氧化带、过渡带和还原带, 其中铀异常主要位于过渡带内。叠合沉积微相、氧化还原带展布、铀异常展布和油气分布等特征, 认为油气富集带附近的过渡带中, 边滩和河道微相砂体中均具有良好的铀成矿条件。综合分析认为, 港东港西地区西7-14-2、西1603、港3-6-20和港8-15-1井区是大港探区砂岩型铀矿的有利找矿位置, 研究结果为渤海湾盆地砂岩型铀矿勘探提供了启示意义。
Abstract:Objective The Bohai Bay Basin, situated within the Eurasian metallogenic belt, is one of the world's two largest belts for sandstone-type uranium deposits, exhibiting significant potential for uranium mineralization. Well logging data indicate the development of extensive high gamma-ray anomalies within the Minghuazhen Formation in the Dagang area.
Methods To investigate uranium ore formation and guide exploration efforts, a multiscale sequence stratigraphic framework of the Minghuazhen Formation was established, including a detailed study of sedimentary microfacies and the delineation of redox zones.
Results The Minghuazhen Formation was subdivided into five sequences based on variations in log responses and lithological characteristics. Gamma-ray anomalies predominantly occur in the upper part of the lower member (SPN
m xs) and the lower part of the upper member (SPNm sx) of the Minghuazhen Formation. Four sedimentary microfacies were identified: meandering river channel, levee, overbank, and floodplain. Uranium anomalies are primarily associated with the levee and channel sand bodies. The redox zones in these sections were classified into oxidation, transition, and reduction zones, with uranium anomalies mainly occurring in the transition zone.Conclusion The integration of sedimentary facies, redox zone distribution, uranium anomaly distribution, and oil and gas distribution suggests that the most favorable conditions for uranium mineralization are present in the levee and river channel microfacies within the transition zone near oil-gas enrichment areas. Consequently, the X7-14-2, X1603, G3-6-20, and G8-15-1 well areas are identified as the most prospective targets for sandstone-type uranium deposits in the Dagang area. This study provides valuable insights for the exploration of sandstone-type uranium deposits in the Bohai Bay Basin.
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图 2 黄骅坳陷新生代地层综合柱状图(据文献[15]修改)
Figure 2. Composite stratigraphic column of Cenozoic in the Huanghua Depression
图 3 黄骅坳陷新近系三级层序地层格架(地层代号见图 2，下同)
Figure 3. Third-order sequence stratigraphic framework of the Huanghua Depression in the Neogene
图 4 大港地区三级层序界面钻井识别标志图
Figure 4. Third-order sequence boundary identification map of drill cores in the Dagang area
图 5 大港地区四级层序界面钻井识别标志图
Figure 5. Fourth-order sequence boundary identification map of drill cores in the Dagang area
图 6 大港地区五级层序界面钻井识别标志图
Figure 6. Fifth-order sequence boundary identification map of drill cores in the Dagang area
图 7 黄骅坳陷明化镇组层序地层格架
Figure 7. Sequence stratigraphic framework of the Minghuazhen Formation in the Huanghua Depression
图 8 大港地区明化镇组钻井测井数据
Figure 8. Drilling and logging data for the Minghuazhen Formation in the Dagang area
图 9 不同沉积微相下的典型样品
a.粗砾岩；b.细砂岩；c.泥质粉砂岩；d.泥岩；e.粗砾岩镜下特征；f.细砂岩镜下特征；g.泥质粉砂岩镜下特征；h.泥岩镜下特征
Figure 9. Typical samples with different sedimentary microfacies
图 10 港东港西地区明下上亚段(a)和明上下亚段(b)沉积微相图
Figure 10. Sedimentary microfacies diagrams of Nmxs(a) and Nmsx(b) in the Gangdong-Gangxi area
图 11 明化镇组砂体展布规律剖面图
Figure 11. Cross-section of the sand body distribution of the Minghuazhen Formation
图 13 氧化还原(REDOX)带下的样品
a.红色泥岩；b.灰色粉砂岩；c.含黄铁矿团块绿细砂岩；d.显微镜下碎裂的黄铁矿；e.石英颗粒内的流体包裹体(单偏光)；f.流体包裹体发淡蓝色荧光；g.丝炭和黄铁矿共生；h.绿色泥岩和红色泥岩界限；i.长石溶蚀孔内含黄铁矿
Figure 13. Samples in the REDOX zone
图 14 港东-港西地区明下段上亚段(a)和明上段下亚段(b)氧化还原分带图
Figure 14. REDOX zones of Nmxs(a) and Nmsx(b) in the Gangdong-Gangxi area
图 16 港东-港西地区明化镇组上段(a)和下段(b)油气分布图
Figure 16. Hydrocarbon distribution map of Nmsx(a) and Nmxs(b) in the Gangdong-Gangxi area
图 18 港东-港西地区铀矿富集规律连井剖面
Figure 18. Drilling cross section of uranium concentration regularity in the Gangdong Gangxi area
图 19 港东-港西地区明下段上亚段(a)和明上段下亚段(b)GR异常分布图
Figure 19. GR anomaly distribution of Nmxs(a) and Nmsx(b) in the Gangdong-Gangxi area
图 20 港东-港西地区明下段上亚段(a)和明上段下亚段(b)有利区带图
Figure 20. Favorable zone map of Nmxs(a) and Nmsx(b) in the Gangdong-Gangxi area
表 1 港Y1井不同价态U和S质量分数
Table 1. Content of U and S in different valence states of GY1
标本号 深度/m w(U6+)/(μg·g-1) w(U4+)/(μg·g-1) w(S6+)/% w(S 2-)/% U6+/U4+ S6+/S2- w(U6++U4+)/(μg·g-1) GY-1 584.67 0.41 3.81 0.28 1.61 0.11 0.17 4.22 GY-2 582.2 0.95 4.67 0.18 0.48 0.20 0.38 5.62 GY-3 581.73 3.94 17.9 0.28 1.20 0.22 0.23 21.86 GY-4 580.74 1.45 7.73 0.32 2.75 0.19 0.12 9.18 GY-5 579.95 1.26 7.68 0.26 0.86 0.16 0.30 8.94 GY-6 579.37 0.93 4.99 0.19 0.87 0.19 0.22 5.92 GY-7 578.63 0.78 5.88 0.25 1.37 0.13 0.18 6.67 GY-8 576.91 0.93 7.43 0.16 0.99 0.13 0.16 8.36 GY-9 576.03 1.00 7.62 0.26 1.23 0.13 0.21 8.62 GY-10 575.15 0.51 4.54 0.27 0.96 0.11 0.28 5.05 GY-11 574.12 0.09 0.92 0.33 1.12 0.09 0.29 1.01 GY-12 572.35 0.20 1.89 0.25 0.51 0.11 0.49 2.09 测试仪器为AXIOS MAX型X射线荧光光谱仪；测试主要参数为：功率3.6 kW；电流120 mA，测角仪重现性：0.000 1°；测试单位为东华理工大学核资源与环境国家重点实验室 
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