0 引言
1 区域地质背景
2 样品采集及测试方法
3 岩石学与矿物学特征
图2 FT1井大隆组岩性特征(a)FT1井,4 577.01~4 577.08 m,大隆组黑色硅质页岩,含方解石脉;(b)FT1井,4 573.96 m,大隆组黑色含钙质碳质泥岩(单偏光);(c)FT1井,4 573.61~4 573.86 m,大隆组黑色含钙质页岩;(d)FT1井,4 577.64 m,大隆组深色含硅质生屑泥岩(单偏光);(e)FT1井,4 576.68~4 576.91 m,大隆组灰色泥晶灰岩—黑色钙质页岩沉积旋回;(f)FT1井,4 558.77 m,大隆组黑色含钙质碳质泥岩(单偏光);(g)FT1井,4 550.97~4 551.25 m,大隆组灰色泥晶灰岩,垂向缝合线构造;(h)FT1井,4 553.57 m,含生屑泥岩(单偏光);(i)FT1井,4 560.49 m大隆组含硅质放射虫与钙球泥岩(正交偏光) Fig.2 Lithological characteristics of the Dalong Formation,Well FT1 |
4 有机地球化学特征
表1 FT1井大隆组元素地球化学特征Table 1 Element geochemical characteristics of the Dalong Formation, Well FT1 |
指标 | 大隆组二段 | 大隆组一段 | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
PD-1 | PD-2 | PD-3 | PD-4 | PD-5 | PD-6 | PD-7 | PD-8 | PD-9 | PD-10 | PD-11 | PD-12 | PD-13 | PD-14 | PD-15 | PD-16 | PD-17 | PD-18 | |
TOC/% | 2.60 | 2.43 | 2.63 | 1.84 | 3.96 | 2.08 | 6.25 | 9.07 | 6.98 | 6.60 | 4.53 | 4.35 | 4.80 | 7.50 | 9.30 | 9.40 | 3.85 | 3.85 |
SiO2/% | 15.24 | 70.12 | 32.91 | 51.46 | 33.85 | 46.11 | 29.65 | 59.06 | 42.57 | 40.30 | 57.40 | 57.16 | 56.04 | 43.97 | 56.80 | 52.17 | 54.35 | 53.99 |
Al2O3/% | 0.37 | 2.84 | 2.52 | 4.64 | 2.42 | 1.68 | 1.67 | 5.14 | 7.01 | 7.39 | 10.11 | 11.08 | 10.27 | 7.33 | 10.85 | 8.18 | 5.11 | 5.27 |
CaO/% | 48.37 | 12.00 | 34.05 | 18.28 | 33.43 | 22.74 | 32.20 | 6.30 | 11.30 | 16.66 | 4.82 | 7.67 | 8.32 | 18.52 | 7.56 | 1.69 | 3.33 | 3.46 |
Fe2O3/% | 0.18 | 0.61 | 0.73 | 2.53 | 0.80 | 2.13 | 0.68 | 3.89 | 3.95 | 6.07 | 2.76 | 4.66 | 3.02 | 2.23 | 4.60 | 5.21 | 8.00 | 8.12 |
Mo/TOC | 0.45 | 1.95 | 3.71 | 136.8 | 2.57 | 15.57 | 1.10 | 19.89 | 15.59 | 8.49 | 2.84 | 4.21 | 1.28 | 1.42 | 1.99 | 18.06 | 129.8 | 127.9 |
V/(V+Ni) | 0.80 | 0.61 | 0.85 | 0.85 | 0.83 | 0.65 | 0.86 | 0.78 | 0.83 | 0.78 | 0.59 | 0.56 | 0.46 | 0.60 | 0.59 | 0.82 | 0.74 | 0.75 |
V/Cr | 1.69 | 1.34 | 2.78 | 5.21 | 2.75 | 4.25 | 6.66 | 3.97 | 5.35 | 3.12 | 2.02 | 2.68 | 1.68 | 2.16 | 2.81 | 3.23 | 2.53 | 2.57 |
U/Th | 6.28 | 2.20 | 8.53 | 4.08 | 9.19 | 5.38 | 3.69 | 2.45 | 3.30 | 2.39 | 2.00 | 1.26 | 0.62 | 0.98 | 1.13 | 9.06 | 7.61 | 9.33 |
δCe | 0.55 | 0.63 | 0.65 | 0.69 | 0.66 | 0.80 | 0.80 | 0.86 | 0.87 | 0.90 | 1.00 | 0.88 | 0.93 | 0.81 | 0.97 | 1.00 | 0.86 | 0.95 |
CuXS/10-6 | 6.86 | 31.24 | 45.55 | 71.31 | 41.87 | 56.64 | 132.0 | 116.0 | 142.6 | 131.7 | 131.0 | 122.9 | 95.32 | 69.00 | 128.4 | 135.6 | 112.8 | 120.1 |
NiXS/10-6 | 5.88 | 28.96 | 54.02 | 142.4 | 56.78 | 196.9 | 51.60 | 312.5 | 263.8 | 347.4 | 336.8 | 275.6 | 295.4 | 123.6 | 251.3 | 428.8 | 512.2 | 489.6 |
Ni/Al | 29.69 | 19.24 | 40.55 | 57.98 | 44.28 | 221.13 | 58.43 | 114.88 | 71.08 | 88.77 | 62.91 | 46.98 | 54.34 | 31.86 | 43.74 | 99.02 | 189.36 | 175.40 |
Zr/10-6 | 7.01 | 19.90 | 32.15 | 103.55 | 29.42 | 20.75 | 16.47 | 56.45 | 83.79 | 80.95 | 155.5 | 182.5 | 209.7 | 139.7 | 137.2 | 185.4 | 116.6 | 109.9 |
Hf/10-6 | 0.15 | 0.96 | 0.88 | 2.80 | 0.82 | 0.63 | 0.46 | 1.36 | 1.62 | 1.85 | 3.50 | 3.22 | 6.07 | 3.86 | 2.33 | 3.77 | 2.48 | 2.35 |
CIA | 51.66 | 69.16 | 69.18 | 71.31 | 69.57 | 66.43 | 63.90 | 70.85 | 69.61 | 70.12 | 73.56 | 73.24 | 71.67 | 65.81 | 72.97 | 75.12 | 69.60 | 69.21 |
Sr/Ba | 0.02 | 0.02 | 0.04 | 0.03 | 0.04 | 0.05 | 0.04 | 0.06 | 0.06 | 0.05 | 0.05 | 0.05 | 0.04 | 0.05 | 0.05 | 0.04 | 0.05 | 0.06 |
Ti/Al | 0.16 | 0.03 | 0.06 | 0.06 | 0.06 | 0.07 | 0.07 | 0.05 | 0.04 | 0.05 | 0.05 | 0.05 | 0.05 | 0.06 | 0.05 | 0.07 | 0.06 | 0.06 |
ω(La)N/ω(Yb)N | 0.50 | 0.56 | 0.58 | 0.79 | 0.66 | 0.64 | 0.74 | 0.60 | 0.46 | 0.46 | 0.30 | 0.47 | 0.48 | 0.44 | 0.58 | 0.28 | 0.44 | 0.45 |