Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (2): 440-456.doi: 10.11743/ogg20240210
• Petroleum Geology • Previous Articles Next Articles
Changbo ZHAI1,2(), Liangbiao LIN3,4, Donghua YOU1, Fengbin LIU3,4, Siyu LIU3,4
Received:
2023-11-24
Revised:
2024-03-05
Online:
2024-04-30
Published:
2024-04-30
CLC Number:
Changbo ZHAI, Liangbiao LIN, Donghua YOU, Fengbin LIU, Siyu LIU. Sedimentary microfacies characteristics and organic matter enrichment pattern of the 1st member of the Middle Permian Maokou Formation, southwestern Sichuan Basin[J]. Oil & Gas Geology, 2024, 45(2): 440-456.
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Table 1
Classification scheme and properties of the sedimentary microfacies on the Shawan outcrop in Leshan, southwestern Sichuan Basin"
沉积微相代号 | 沉积微相 类型 | 黏土矿物 含量/% | 灰泥 含量/% | 岩石 类型 | 化石类型 | 沉积 结构 | 野外沉积构造 |
---|---|---|---|---|---|---|---|
MF1 | 生物碎屑含灰泥岩 | 75 ~ 90 | — | 含灰 泥岩 | 介形虫、棘皮类 | 可见生屑呈定向纹层 | 深灰色、中-薄层状 |
MF2 | 生物碎屑泥灰岩 | 25 ~ 50 | — | 泥灰岩 | 介形虫、棘皮类 | 灰黑色、薄层状、 “眼皮”构造 | |
MF3 | 生物碎屑含泥灰岩 | 10 ~ 25 | — | 含泥 灰岩 | 介形虫、棘皮类 | “眼皮”构造 | |
MF4 | 灰泥灰岩 | <10 | >90 | 灰岩 | 介形虫、棘皮类,含量<10 % | — | 灰色、“眼球”构造 |
MF5 | 生物碎屑粒泥石灰岩 | 50 ~ 90 | 双壳、腹足、棘皮、藻类化石等,含量10 % ~ 50 % | — | 灰色、厚层状 | ||
MF6 | 钙藻粒泥石灰岩 | 50 ~ 90 | 钙藻为主,少量双壳、腹足、棘皮,含量10 % ~ 50 % | — | 灰色、厚层-块状 | ||
MF7 | 生物碎屑泥粒灰岩 | <50 | 双壳、腹足、棘皮、藻类化石等,含量>50 % | — | 灰色、厚层状 | ||
MF8 | 钙藻泥粒石灰岩 | <50 | 钙藻为主,少量双壳、腹足、棘皮等,含量>50 % | — | 灰色、厚层状 |
Table 2
Test data on the major and trace elements and TOC content in the Shawan outcrop in Leshan, southwestern Sichuan Basin"
地层 | 样品号 | 主量元素化合物含量/% | 微量元素含量/10-6 | TOC/% | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | Al2O3 | CaO | MgO | P2O5 | Mo | U | V | Cd | Co | ||||
茅 一 一 亚 段 | SW-3-1 | 0.85 | 0.41 | 54.55 | 0.53 | 0.009 | 1.25 | 4.90 | 42.90 | 0.38 | 2.25 | 未测 | |
SW-4-1 | 0.75 | 0.26 | 54.80 | 0.49 | 0.002 | 0.95 | 3.03 | 66.40 | 0.37 | 1.87 | 0.52 | ||
SW-4-2 | 1.03 | 0.31 | 54.71 | 0.56 | 0.003 | 5.36 | 7.02 | 52.30 | 0.26 | 1.58 | 未测 | ||
SW-5-1 | 16.57 | 2.83 | 42.09 | 1.46 | 0.005 | 7.13 | 10.40 | 134.00 | 1.29 | 2.93 | 1.33 | ||
SW-6-1 | 2.37 | 0.69 | 53.27 | 0.85 | 0.003 | 2.65 | 6.53 | 57.10 | 0.44 | 1.91 | 未测 | ||
SW-6-2 | 12.37 | 6.07 | 41.51 | 1.58 | 0.006 | 5.53 | 8.89 | 155.00 | 1.33 | 3.03 | 1.04 | ||
SW-6-3 | 13.73 | 1.68 | 45.07 | 1.79 | 0.005 | 2.50 | 6.89 | 80.30 | 0.68 | 1.99 | 未测 | ||
SW-7-1 | 23.80 | 1.57 | 38.69 | 2.69 | 0.007 | 2.41 | 8.75 | 120.00 | 1.70 | 1.57 | 1.29 | ||
SW-8-1 | 31.95 | 1.90 | 32.47 | 4.19 | 0.005 | 2.14 | 7.59 | 106.00 | 0.87 | 2.47 | 1.22 | ||
SW-9-1 | 42.13 | 1.47 | 25.19 | 7.41 | 0.008 | 1.52 | 4.32 | 70.60 | 0.64 | 1.24 | 0.77 | ||
SW-9-2 | 3.19 | 0.27 | 52.71 | 1.82 | 0.002 | 0.47 | 5.75 | 17.70 | 0.07 | 1.51 | 未测 | ||
SW-10-1 | 49.17 | 1.12 | 11.53 | 23.22 | 0.007 | 1.18 | 4.80 | 103.00 | 0.68 | 0.67 | 1.35 | ||
SW-11-1 | 27.23 | 0.69 | 34.58 | 7.74 | 0.003 | 0.34 | 2.72 | 40.70 | 0.27 | 0.84 | 0.58 | ||
SW-12-1 | 36.03 | 0.74 | 24.38 | 16.11 | 0.002 | 1.84 | 4.45 | 48.30 | 1.51 | 0.93 | 0.97 | ||
SW-13-1 | 4.00 | 0.34 | 52.25 | 1.79 | 0.002 | 1.87 | 5.90 | 14.80 | 0.40 | 1.38 | 未测 | ||
SW-14-1 | 18.90 | 0.55 | 42.10 | 2.98 | 0.002 | 1.69 | 4.46 | 56.40 | 1.05 | 1.22 | 未测 | ||
SW-15-1 | 6.66 | 0.61 | 50.26 | 1.43 | 0.005 | 5.39 | 5.79 | 43.40 | 0.99 | 1.94 | 0.97 | ||
SW-16-1 | 0.88 | 0.22 | 54.64 | 0.54 | 0.004 | 0.90 | 2.75 | 61.50 | 1.03 | 1.40 | 未测 | ||
SW-17-1 | 19.83 | 0.80 | 42.41 | 1.94 | 0.003 | 2.39 | 10.50 | 63.30 | 1.52 | 1.25 | 0.81 | ||
SW-18-1 | 4.25 | 0.26 | 52.45 | 1.18 | 0.003 | 0.49 | 5.97 | 15.20 | 0.45 | 1.28 | 未测 | ||
SW-19-1 | 28.38 | 0.42 | 32.96 | 10.46 | 0.002 | 0.38 | 4.45 | 38.60 | 0.31 | 1.07 | 0.82 | ||
茅 一 二 亚 段 | SW-20-1 | 19.23 | 0.15 | 44.37 | 0.83 | 0.001 | 2.85 | 10.80 | 41.40 | 0.72 | 1.01 | 未测 | |
SW-20-2 | 10.63 | 2.00 | 43.48 | 6.66 | 0.002 | 0.34 | 5.37 | 54.80 | 1.85 | 1.07 | 0.29 | ||
SW-20-3 | 0.91 | 0.22 | 54.20 | 1.12 | 0.002 | 0.23 | 10.00 | 9.39 | 0.17 | 1.46 | 未测 | ||
SW-21-1 | 3.33 | 0.98 | 50.19 | 2.89 | 0.002 | 29.90 | 15.20 | 294.00 | 3.68 | 1.86 | 未测 | ||
SW-21-2 | 2.33 | 0.56 | 52.07 | 1.85 | 0.003 | 12.70 | 8.54 | 166.00 | 2.51 | 1.58 | 1.57 | ||
SW-22-1 | 3.12 | 0.49 | 52.16 | 1.40 | 0.002 | 2.46 | 9.99 | 59.50 | 1.12 | 1.43 | 未测 | ||
SW-22-2 | 3.20 | 0.28 | 52.49 | 1.45 | 0.002 | 1.38 | 8.55 | 39.20 | 0.44 | 1.18 | 未测 | ||
SW-23-1 | 3.13 | 0.89 | 50.61 | 2.66 | 0.004 | 45.20 | 18.60 | 300.00 | 3.74 | 2.26 | 未测 | ||
SW-23-2 | 1.26 | 0.15 | 54.33 | 0.95 | 0.002 | 5.98 | 11.70 | 27.70 | 0.38 | 1.31 | 未测 | ||
SW-24-1 | 15.33 | 0.56 | 32.14 | 13.68 | 0.003 | 5.75 | 5.41 | 47.00 | 0.69 | 1.08 | 未测 | ||
SW-25-1 | 3.97 | 0.13 | 52.45 | 0.98 | 0.002 | 0.91 | 4.05 | 19.30 | 0.35 | 1.20 | 0.30 | ||
SW-26-1 | 37.72 | 0.34 | 27.31 | 5.97 | 0.004 | 1.13 | 4.81 | 60.90 | 0.82 | 0.77 | 未测 | ||
SW-28-1 | 1.04 | 0.08 | 54.85 | 0.53 | 0.003 | 0.38 | 7.04 | 12.30 | 0.24 | 1.22 | 未测 | ||
SW-29-1 | 0.32 | 0.13 | 55.15 | 0.43 | 0.002 | 0.61 | 4.77 | 22.50 | 0.17 | 1.43 | 未测 | ||
SW-31-1 | 0.34 | 0.24 | 55.11 | 0.61 | 0.002 | 2.16 | 4.50 | 23.30 | 0.14 | 1.47 | 0.06 | ||
SW-32-1 | 0.46 | 0.20 | 54.84 | 0.58 | 0.003 | 1.19 | 4.56 | 39.30 | 0.24 | 1.46 | 未测 | ||
茅一三亚段 | SW-33-1 | 6.27 | 2.26 | 49.84 | 0.72 | 0.007 | 13.40 | 9.65 | 117.00 | 0.64 | 2.95 | 未测 | |
SW-33-2 | 1.41 | 0.60 | 54.18 | 0.73 | 0.004 | 4.83 | 2.90 | 35.50 | 0.28 | 1.77 | 0.90 |
Table 4
Tested TOC content and recovered original organic parent material abundance (TOC0) of the Shawan outcrop in Leshan, southwestern Sichuan Basin"
地层 | 样品编号 | 岩性 | TOC/% | TOC0/% |
---|---|---|---|---|
茅一一亚段 | SW-4-1 | 生屑含灰泥岩 | 0.52 | 1.17 |
SW-5-1 | 生屑含泥灰岩 | 1.33 | 2.99 | |
SW-6-2 | 生屑含泥灰岩 | 1.04 | 2.34 | |
SW-7-1 | 生屑泥灰岩 | 1.29 | 2.90 | |
SW-8-1 | 生屑泥灰岩 | 1.22 | 2.75 | |
SW-9-1 | 生屑含泥灰岩 | 0.77 | 1.73 | |
SW-10-1 | 生屑含灰泥岩 | 1.35 | 3.04 | |
SW-11-1 | 生屑泥灰岩 | 0.58 | 1.31 | |
SW-12-1 | 生屑泥灰岩 | 0.97 | 2.18 | |
SW-15-1 | 生屑泥粒灰岩 | 0.97 | 2.18 | |
SW-17-1 | 生屑粒泥灰岩 | 0.81 | 1.82 | |
SW-19-1 | 生屑粒泥灰岩 | 0.82 | 1.85 | |
茅一二亚段 | SW-20-2 | 灰泥灰岩 | 0.29 | 0.65 |
SW-21-2 | 生屑泥粒灰岩 | 1.57 | 3.53 | |
SW-25-1 | 钙藻粒泥灰岩 | 0.3 | 0.68 | |
SW-31-1 | 钙藻粒泥灰岩 | 0.06 | 0.14 | |
茅一三亚段 | SW-33-2 | 生屑泥灰岩 | 0.9 | 2.03 |
Table 5
Summary of paleoenvironmental indicators of the Shawan outcrop in Leshan, southwestern Sichuan Basin"
地层 | 样品号 | Th/U | V/Sc | MoEF/UEF | Mo/TOC | Sr/Ba | P含量/10-6 | Cu含量/10-6 | Zn含量/10-6 | TOC/P | Cd/Mo | Co(10-6)×Mn(%) |
---|---|---|---|---|---|---|---|---|---|---|---|---|
茅一一亚段 | SW-3-1 | 0.26 | 62.17 | 12.37 | 未测 | 36.09 | 38.75 | 3.19 | 27.70 | 未测 | 0.30 | 0.024 |
SW-4-1 | 0.35 | 138.33 | 28.58 | 1.83 | 71.33 | 8.52 | 1.81 | 37.20 | 8.38 | 0.39 | 0.002 | |
SW-4-2 | 0.07 | 217.92 | 284.96 | 未测 | 84.41 | 13.06 | 2.14 | 9.74 | 未测 | 0.05 | 0.024 | |
SW-5-1 | 0.33 | 50.19 | 4.06 | 5.36 | 17.93 | 22.14 | 5.97 | 28.90 | 0.81 | 0.18 | 0.288 | |
SW-6-1 | 0.19 | 54.38 | 15.06 | 未测 | 46.26 | 12.90 | 2.26 | 21.70 | 未测 | 0.17 | 0.017 | |
SW-6-2 | 0.39 | 64.32 | 0.62 | 5.32 | 22.60 | 24.28 | 7.40 | 31.50 | 0.93 | 0.24 | 0.799 | |
SW-6-3 | 0.25 | 48.08 | 2.13 | 未测 | 31.81 | 22.00 | 3.55 | 22.00 | 未测 | 0.27 | 0.132 | |
SW-7-1 | 0.16 | 100.84 | 1.79 | 1.87 | 20.86 | 31.59 | 4.66 | 23.40 | 0.66 | 0.71 | 0.149 | |
SW-8-1 | 0.29 | 51.46 | 1.11 | 1.75 | 11.08 | 22.44 | 6.01 | 31.90 | 0.49 | 0.41 | 0.305 | |
SW-9-1 | 0.38 | 40.81 | 1.65 | 1.97 | 10.38 | 36.96 | 3.17 | 19.70 | 0.28 | 0.42 | 0.109 | |
SW-9-2 | 0.11 | 32.78 | 3.61 | 未测 | 58.19 | 8.61 | 0.79 | 5.66 | 未测 | 0.16 | 0.012 | |
SW-10-1 | 0.26 | 86.55 | 1.53 | 0.87 | 5.20 | 30.23 | 2.54 | 16.90 | 0.17 | 0.58 | 0.110 | |
SW-11-1 | 0.28 | 67.83 | 0.60 | 0.59 | 23.04 | 13.27 | 1.82 | 9.54 | 1.74 | 0.79 | 0.065 | |
SW-12-1 | 0.20 | 49.29 | 9.36 | 1.90 | 11.58 | 9.05 | 1.95 | 21.30 | 1.28 | 0.82 | 0.129 | |
SW-13-1 | 0.10 | 27.41 | 33.56 | 未测 | 10.53 | 8.55 | 1.53 | 9.13 | 未测 | 0.21 | 0.012 | |
SW-14-1 | 0.14 | 79.44 | 13.86 | 未测 | 19.59 | 8.80 | 2.61 | 9.77 | 未测 | 0.62 | 0.070 | |
SW-15-1 | 0.15 | 73.56 | 88.59 | 5.59 | 94.95 | 21.62 | 4.69 | 22.70 | 4.39 | 0.18 | 0.050 | |
SW-16-1 | 0.15 | 161.84 | 39.27 | 未测 | 92.76 | 16.97 | 1.33 | 6.64 | 未测 | 1.14 | 0.001 | |
SW-17-1 | 0.09 | 75.36 | 5.62 | 2.95 | 13.68 | 13.15 | 3.77 | 13.50 | 1.04 | 0.64 | 0.083 | |
SW-18-1 | 0.06 | 43.43 | 4.03 | 未测 | 52.84 | 12.98 | 0.84 | 6.31 | 未测 | 0.92 | 0.023 | |
SW-19-1 | 0.14 | 80.42 | 1.23 | 0.46 | 13.03 | 8.91 | 1.73 | 11.00 | 1.46 | 0.82 | 0.096 | |
茅一二亚段 | SW-20-1 | 0.03 | 133.55 | 0.74 | 未测 | 88.10 | 4.35 | 0.78 | 4.85 | 未测 | 0.25 | 0.040 |
SW-20-2 | 0.57 | 46.05 | 0.04 | 1.18 | 0.86 | 8.70 | 2.45 | 16.20 | 0.10 | 5.44 | 0.023 | |
SW-20-3 | 0.06 | 23.48 | 224.06 | 未测 | 22.16 | 8.64 | 0.81 | 18.90 | 未测 | 0.74 | 0.017 | |
SW-21-1 | 0.06 | 326.67 | 405.80 | 17.38 | 4.08 | 8.74 | 4.47 | 21.30 | 0.47 | 0.12 | 0.043 | |
SW-21-2 | 0.08 | 204.94 | 406.66 | 8.09 | 9.14 | 13.02 | 3.85 | 16.70 | 0.70 | 0.20 | 0.028 | |
SW-22-1 | 0.08 | 104.39 | 19.06 | 未测 | 101.63 | 8.60 | 1.86 | 8.35 | 未测 | 0.46 | 0.021 | |
SW-22-2 | 0.07 | 93.33 | 16.65 | 未测 | 144.31 | 8.70 | 1.51 | 26.50 | 未测 | 0.32 | 0.022 | |
SW-23-1 | 0.05 | 394.74 | 930.16 | 23.06 | 39.55 | 18.30 | 8.28 | 24.20 | 2.16 | 0.08 | 0.128 | |
SW-23-2 | 0.03 | 102.59 | 921.61 | 未测 | 161.13 | 8.61 | 0.79 | 5.32 | 未测 | 0.06 | 0.012 | |
SW-24-1 | 0.21 | 73.44 | 127.82 | 未测 | 54.47 | 12.96 | 2.13 | 12.30 | 未测 | 0.12 | 0.067 | |
SW-25-1 | 0.10 | 64.33 | 82.42 | 3.07 | 100.24 | 8.63 | 0.93 | 5.06 | 11.61 | 0.38 | 0.023 | |
SW-26-1 | 0.11 | 121.80 | 15.01 | 未测 | 30.66 | 17.62 | 2.50 | 9.23 | 未测 | 0.73 | 0.059 | |
SW-28-1 | 0.05 | 53.48 | 22.60 | 未测 | 29.07 | 12.72 | 0.83 | 5.38 | 未测 | 0.63 | 0.005 | |
SW-29-1 | 0.06 | 125.00 | 32.92 | 未测 | 50.78 | 8.44 | 1.28 | 6.23 | 未测 | 0.28 | 0.008 | |
SW-31-1 | 0.12 | 101.30 | 123.97 | 35.88 | 53.13 | 8.58 | 0.76 | 5.57 | 6.19 | 0.06 | 0.016 | |
SW-32-1 | 0.09 | 126.77 | 50.22 | 未测 | 45.30 | 12.65 | 1.25 | 5.87 | 未测 | 0.20 | 0.010 | |
茅一三亚段 | SW-33-1 | 0.35 | 53.18 | 24.35 | 未测 | 35.78 | 30.91 | 2.61 | 15.80 | 未测 | 0.05 | 0.107 |
SW-33-2 | 0.60 | 54.62 | 148.30 | 5.37 | 92.19 | 17.20 | 1.11 | 8.30 | 5.36 | 0.06 | 0.014 |
Table 6
Correlation coefficients between TOC content and paleoenvironmental indicators of the Shawan outcrop in Leshan, southwestern Sichuan Basin"
参数 | TOC/% | Ga/Al | Sr/Ba | Mo/TOC | Th/U | V/Sc | MoEF/UEF | Cd/Mo | Co(10-6)×Mn(%) | P含量/10-6 | Cu含量/10-6 | Zn含量/10-6 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
TOC/% | 1 | |||||||||||
Ga/Al | -0.41 | 1 | ||||||||||
Sr/Ba | -0.37 | 0.71 | 1 | |||||||||
Mo/TOC | -0.03 | 0.21 | 0.04 | 1 | ||||||||
Th/U | -0.30 | -0.36 | -0.09 | -0.49 | 1 | |||||||
V/Sc | 0.67 | 0.03 | -0.22 | 0.54 | -0.59 | 1 | ||||||
MoEF/UEF | 0.57 | 0.17 | 0.02 | 0.56 | -0.46 | 0.93 | 1 | |||||
Cd/Mo | -0.39 | -0.23 | -0.38 | -0.33 | 0.52 | -0.25 | -0.25 | 1 | ||||
Co(10-6)× Mn(%) | 0.20 | -0.55 | -0.30 | -0.18 | 0.18 | -0.14 | -0.18 | -0.18 | 1 | |||
P含量/10-6 | 0.49 | -0.57 | -0.22 | -0.46 | 0.05 | -0.18 | -0.23 | -0.28 | 0.43 | 1 | ||
Cu含量/10-6 | 0.73 | -0.57 | -0.36 | 0.01 | -0.21 | 0.48 | 0.45 | -0.20 | 0.63 | 0.43 | 1 | |
Zn含量/10-6 | 0.67 | -0.78 | -0.52 | -0.23 | -0.03 | 0.21 | 0.10 | -0.07 | 0.68 | 0.56 | 0.91 | 1.00 |
Table 7
Summary of the TOC content and paleoenvironmental indicator values of the various sedimentary microfacies in the Shawan outcrop in Leshan, southwestern Sichuan Basin"
沉积微相代号 | 沉积微相类型 | 样品数/个 | TOC0 平均值/% | 古氧相指标 | 上升洋流指标 | 初级生产力指标 | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Th/U | V/Sc | MoEF/UEF | Cd/Mo | Co(10-6)×Mn(%) | P含量/10-6 | Cu含量/10-6 | Zn含量/10-6 | TOC/P | ||||
MF1 | 生物碎屑含灰泥岩 | 1 | 3.38 | 0.19 | 104.18 | 8.27 | 0.65 | 0.08 | 23.93 | 2.52 | 13.07 | 0.04 |
MF2 | 生物碎屑泥灰岩 | 5 | 2.88 | 0.27 | 110.28 | 158.16 | 0.42 | 0.13 | 20.39 | 3.78 | 19.21 | 0.07 |
MF3 | 生物碎屑含泥灰岩 | 3 | 2.62 | 0.31 | 58.69 | 5.05 | 0.37 | 0.32 | 23.04 | 4.79 | 22.47 | 0.04 |
MF4 | 灰泥灰岩 | 1 | 0.72 | 0.20 | 35.09 | 9.59 | 1.83 | 0.02 | 9.72 | 1.41 | 12.64 | 0.03 |
MF5 | 生物碎屑粒泥灰岩 | 1 | 2.03 | 0.09 | 75.36 | 5.62 | 0.64 | 0.08 | 13.15 | 3.77 | 13.50 | 0.06 |
MF6 | 钙藻粒泥灰岩 | 2 | 1.38 | 0.20 | 63.19 | 35.81 | 0.16 | 0.21 | 13.59 | 2.80 | 16.11 | 0.02 |
MF7 | 生物碎屑泥粒灰岩 | 3 | 3.55 | 0.08 | 152.25 | 170.10 | 0.24 | 0.03 | 12.94 | 2.93 | 14.28 | 0.12 |
MF8 | 钙藻泥粒灰岩 | 1 | 0.74 | 0.10 | 117.58 | 100.51 | 0.26 | 0.02 | 13.51 | 1.58 | 12.28 | 0.03 |
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