Characteristics of REE and sedimentary environment of mud shale in Wufeng Formation-Gaojiabian Formation in Jurong area, Jiangsu Province
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摘要:
为深入研究江苏句容地区五峰组-高家边组泥页岩的沉积环境、构造背景及物源属性, 指导区域页岩气勘探, 利用等离子体质谱技术对江苏句容地区SY1井五峰组-高家边组泥页岩的稀土元素地球化学特征和沉积环境进行研究。结果表明, 句容地区五峰组泥页岩稀土元素总量低于北美页岩, 高家边组泥页岩稀土元素总量高于北美页岩, 且五峰组-高家边组泥页岩都具有轻稀土元素富集的特征, 轻、重稀土元素分馏程度较高, 分异程度显示从底至顶逐步升高的趋势。δCeN值为0.76~0.91, 平均值为0.86, 显示弱的负Ce异常; 五峰组泥页岩δEuN平均值为1.11, 高家边组一段和二段泥页岩δEuN平均值分别为1.71和1.11, 表明高家边组一段分异最明显, 变化范围较大, 五峰组物源特征较单一, 而高家边组母岩成分复杂, 具有混合特征。五峰组泥页岩的(La/Yb)s平均值为1.28, 高家边组一段泥页岩的(La/Yb)s平均值为1.38, 高家边组二段泥页岩的(La/Yb)s平均值为1.51, 反映出五峰组沉积速率小于高家边组, 且有机质丰度与(La/Yb)s值具有一定的负相关性。δEu、δCe、U/Th、V/Cr、Ni/Co等参数特征揭示, 五峰组-高家边组一段-高家边组二段沉积时期海水的还原性具有富氧-厌氧-富氧过渡的变化特征, 其中高家边组一段底部水体还原程度最高, 为厌氧环境。奥陶纪末期—志留纪早期还原性水体及相对滞留的沉积环境有利于有机质保存, 使句容地区五峰组-高家边组富有机质泥页岩的厚度达到30 m, 由此初步认为, 五峰组-高家边组一段泥页岩为优质页岩气储层。
Abstract:In order to explore the depositional and tectonic environment as well as provenance feature of the mud shale of Wufeng Formation-Gaojiabian Formation and guide regional shale gas exploration, the rare earth element composition (REE) of these rocks in Well SY1 from Jurong area was analyzed by Inductively Coupled-Mass Spectrometry (ICP-MS) in this study.The result shows that the total amount of rare earth elements of mud shale in Wufeng Formation is lower than that in North American shale while that in Gaojiabian Formation is reverse.Both Wufeng Formation and Gaojiabian Formation of mud shale are characterized by enrichment of the light rare earth elements and by commonly high fractionation which gradually increases from the bottom to the top. δCeN value is 0.76~0.91, with an average value of 0.86, showing a weak negative anomaly.The δEuN mean value of mud shale in Wufeng Formation is 1.11, while that of the first member and the second member of Gaojiabian Formation is 1.71 and 1.11, respectively, indicating that the first member of Gaojiabian Formation has the most obvious differentiation and a large range of variation.The ΣREE-La/Yb graphic shows that the provenance of mud shale in Wufeng Formation is relatively single, while the parent rocks of mud shale in Gaojiabian Formation have complex and mixed composition.The mean value of La/Yb indicates that the deposition rate of mud shale in Wufeng Formation is less than that of Gaojiabian Formation, and the abundance of organic matter is negatively correlated with the value of(La/Yb)s to a certain extent. δEu, δCe, U/Th, V/Cr, Ni/Co and other parameters suggest that the seawater reducibility were characterized by oxygen-enriched, anaerobic and oxygen-enriched transition from base to top.The reduced water and relatively euxinic sedimentary environment in the Late Ordovician and Early Silurian were favorable for the preservation of organic matter, which resulted in the organic-rich mud shales in the Wufeng Formation-Gaojiabian Formation in Jurong area reaching a thickness of about 30 meters.Accordingly, the shale of Wufeng Formation and the first member of Gaojiabian Formation in the Jurong area represent a high-quality shale gas reservoir.
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表 1 SY1井五峰组-高家边组泥页岩稀土元素含量
Table 1. Contents of rare earth elements of mud shale in Wufeng Formation -Gaojiabian Formation in well SY1
10-6 样品号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu SY1-10 21.83 38.43 4.78 17.15 3.09 1.15 3.3 0.53 3.28 0.59 1.82 0.27 1.69 0.27 SY1-13 33.4 56.78 6.81 24.34 3.68 1.42 3.27 0.46 3.11 0.69 2.11 0.37 2.21 0.34 SY1-16 28.33 43.33 5.88 21.12 4.17 1.44 3.91 0.56 3.23 0.62 2 0.3 2.05 0.34 SY1-19 22.87 36.72 4.71 18.14 3.21 1.16 3.36 0.5 3.09 0.63 1.89 0.3 1.86 0.31 SY1-22 20.92 36.04 4.63 17.65 3.18 1.01 3.74 0.56 3.15 0.64 1.85 0.28 1.73 0.27 SY1-24 51.99 92.69 11.41 42.69 8.58 4.39 8.05 1.28 7.69 1.57 4.82 0.74 4.45 0.76 SY1-25 51.08 89.05 10.53 38.6 7.03 4.66 6.83 0.95 5.77 1.2 3.72 0.62 3.64 0.55 SY1-26 40.29 71.32 8.81 31.54 5.98 4.35 5.39 0.82 4.94 0.98 3.11 0.48 3.17 0.5 SY1-28 71.23 121.31 13.59 45.79 7.75 4.69 6.85 0.95 6.07 1.24 3.92 0.63 3.86 0.64 SY1-31 41.2 73.66 8.9 32.28 5.96 2.05 5.23 0.83 5.14 1.01 3.12 0.49 2.95 0.46 SY1-37 46.4 78.44 9.12 31.53 5.4 1.71 5.38 0.9 5.57 1.09 3.25 0.53 3.14 0.47 SY1-40 52.12 91.44 11.25 43.44 7 2.34 6.28 0.89 5.52 1.13 3.31 0.52 3.34 0.51 SY1-42 46.31 85.97 10.23 37.98 6.52 1.81 6.05 0.82 5.13 1.01 3.13 0.51 3.02 0.54 SY1-43 36 65.11 7.68 29.18 4.94 1.5 5.18 0.76 4.32 0.86 2.52 0.39 2.47 0.4 SY1-44 45.62 79.58 9.51 35.25 5.94 1.72 5.63 0.69 4.77 0.97 2.93 0.48 2.91 0.44 SY1-45 52.77 90.3 10.36 38.73 6.6 2.87 6.02 0.9 5.66 1.14 3.18 0.47 2.9 0.42 SY1-46 45.49 79.93 9.46 35.25 7.39 2.04 5.82 0.79 4.92 1.05 3.05 0.48 3 0.45 SY1-49 40.94 74.11 8.96 34.26 5.58 1.77 5.54 0.85 4.91 0.97 3.03 0.46 2.84 0.47 SY1-51 46.92 80.27 9.85 33.39 6.09 2.21 4.76 0.69 4.44 0.95 2.9 0.44 2.91 0.44 SY1-52 41.72 73.66 8.66 31.29 5.32 2.07 4.94 0.76 4.59 0.91 2.83 0.45 2.76 0.43 SY1-54 38.86 67.16 8.29 30.91 5.2 2.36 4.46 0.66 4.08 0.8 2.58 0.37 2.46 0.35 SY1-55 45.1 76.96 9.21 33.89 5.85 2.34 5.1 0.74 4.44 0.91 2.66 0.42 2.61 0.4 SY1-56 43.93 76.16 9.27 34.51 5.42 2.39 5.76 0.78 4.98 0.98 2.99 0.46 2.91 0.42 SY1-57 44.45 76.73 9.38 33.64 6.67 2.31 5.2 0.79 4.83 0.93 2.85 0.47 2.83 0.45 SY1-59 30.28 58.49 7.22 28.56 5.4 1.43 5.32 0.79 4.39 0.82 2.36 0.35 2.29 0.37 SY1-62 43.67 80.04 9.21 35.38 6.86 1.85 5.98 0.88 5.03 0.99 2.94 0.46 2.85 0.45 SY1-65 52.25 89.62 10.73 39.84 7.17 2.09 5.59 0.88 5.12 1.07 3.24 0.49 3.2 0.48 SY1-68 44.06 77.87 9.15 33.39 5.85 1.86 5.05 0.71 4.56 1.01 3.05 0.46 2.92 0.46 SY1-71 46.27 82.89 9.76 35.38 5.96 2.04 5 0.71 4.42 0.9 2.97 0.45 2.8 0.54 北美页岩[21] 32 73 7.9 33 5.7 1.24 5.2 0.85 5.8 1.04 3.4 0.5 3.1 0.48 球粒陨石[21] 0.3 0.8 0.12 0.6 0.19 0.07 0.26 0.05 0.32 0.07 0.21 0.03 0.21 0.03 
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表 2 SY1井五峰组-高家边组泥页岩稀土元素地球化学特征
Table 2. REE geochemical characteristics of mud shale in Wufeng Formation - Gaojiabian Formation in well SY1
样号 ΣREE/
10-6ΣLREE/
10-6ΣHREE/
10-6ΣLREE/
ΣHREE(La/Yb)N (La/Sm)N (Ce/Yb)N (La/Yb)s δCeN δEuN δCeS δEuS TOC/% SY1-10 98.18 86.43 11.75 7.36 9.04 4.47 5.97 1.25 0.85 1.13 0.83 1.58 2.08 SY1-13 138.99 126.43 12.56 10.07 10.58 5.75 6.74 1.46 0.84 1.27 0.81 1.80 1.17 SY1-16 117.28 104.27 13.01 8.01 9.67 4.30 5.55 1.34 0.76 1.11 0.85 1.57 2.47 SY1-19 98.75 86.81 11.94 7.27 8.61 4.51 5.18 1.19 0.79 1.11 0.82 1.55 2.47 SY1-22 95.65 83.43 12.22 6.83 8.46 4.17 5.47 1.17 0.83 0.93 0.77 1.28 2.47 SY1-24 241.11 211.75 29.36 7.21 8.18 3.84 5.47 1.13 0.86 1.65 0.87 2.32 1.86 SY1-25 224.23 200.95 23.28 8.63 9.82 4.60 6.42 1.36 0.86 2.10 0.84 2.95 2.85 SY1-26 181.68 162.29 19.39 8.37 8.90 4.27 5.91 1.23 0.86 2.38 0.85 3.36 — SY1-28 288.52 264.36 24.16 10.94 12.92 5.82 8.25 1.79 0.86 2.00 0.82 2.83 2.71 SY1-31 183.28 164.05 19.23 8.53 9.78 4.38 6.55 1.35 0.87 1.14 0.84 1.61 1.83 SY1-37 192.93 172.6 20.33 8.49 10.34 5.44 6.56 1.43 0.85 0.99 0.82 1.39 1.10 SY1-40 229.09 207.59 21.5 9.66 10.92 4.72 7.19 1.51 0.85 1.10 0.86 1.55 0.16 SY1-42 209.03 188.82 20.21 9.34 10.73 4.50 7.47 1.49 0.90 0.90 0.82 1.27 0.33 SY1-43 161.31 144.41 16.9 8.54 10.20 4.62 6.92 1.41 0.88 0.93 0.80 1.30 0.13 SY1-44 196.44 177.62 18.82 9.44 10.97 4.86 7.18 1.52 0.86 0.93 0.83 1.31 0.39 SY1-45 222.32 201.63 20.69 9.75 12.74 5.06 8.17 1.76 0.86 1.42 0.82 2.00 0.16 SY1-46 199.12 179.56 19.56 9.18 10.61 3.90 6.99 1.47 0.87 0.95 0.83 1.36 0.58 SY1-49 184.69 165.62 19.07 8.68 10.09 4.65 6.85 1.40 0.88 1.00 0.84 1.40 0.24 SY1-51 196.26 178.73 17.53 10.20 11.29 4.88 7.24 1.56 0.84 1.25 0.84 1.80 0.99 SY1-52 180.39 162.72 17.67 9.21 10.58 4.97 7.01 1.46 0.87 1.26 0.81 1.77 0.74 SY1-54 168.54 152.78 15.76 9.69 11.06 4.73 7.17 1.53 0.85 1.51 0.86 2.15 1.80 SY1-55 190.63 173.35 17.28 10.03 12.10 4.88 7.74 1.67 0.85 1.33 0.82 1.88 1.70 SY1-56 190.96 171.68 19.28 8.90 10.57 5.13 6.87 1.46 0.85 1.35 0.82 1.87 1.89 SY1-57 191.53 173.18 18.35 9.44 10.99 4.22 7.12 1.52 0.85 1.20 0.84 1.72 1.60 SY1-59 148.07 131.38 16.69 7.87 9.26 3.55 6.70 1.28 0.91 0.84 0.82 1.17 0.08 SY1-62 196.59 177.01 19.58 9.04 10.73 4.03 7.37 1.48 0.90 0.89 0.73 1.27 0.13 SY1-65 221.77 201.7 20.07 10.05 11.43 4.62 7.35 1.58 0.85 1.01 0.84 1.44 0.28 SY1-68 190.4 172.18 18.22 9.45 10.56 4.77 7.00 1.46 0.87 1.06 0.83 1.50 0.36 SY1-71 200.09 182.3 17.79 10.25 11.57 4.92 7.77 1.60 0.88 1.15 0.84 1.64 0.46 注: 稀土元素总量ΣREE =La+Ce+Pr+Nd+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu; 轻稀土元素含量ΣLREE = La+Ce+Pr+Nd+Sm+Eu; 重稀土元素含量ΣHREE = Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu; (La/Sm)N、(La/Yb)N和(Gd/Yb)N为经球粒陨石标准化的比值；δCeN =2CeN/(La+ Pr)N，δEuN =2EuN/(Sm+ Gd)N，此处的N代表经球粒陨石标准化的比值；δEuS =2EuS/(Sm+ Gd)S，此处EuS、SmS、GdS、CeS、LaS和NdS为经北美页岩标准化后的值
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