Geochemical Characteristics and Organic Matter Enrichment Mechanism in Late Paleozoic Mudstone, Eastern Margin of Ordos Basin
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摘要:
鄂尔多斯盆地东缘煤层气、致密砂岩气资源丰富且含气层位较多，为探究煤系地层泥质烃源岩有机碳含量及其影响因素，指导该区煤系气资源高效开发，本文采集了石西地区石盒子组、山西组和太原组共计26块泥质岩样品，利用ICP-MS、SEM、XRF和同位素质谱仪开展有机碳含量、干酪根碳同位素、主微量元素和黏土矿物组成等分析测试工作。基于实验结果，对石炭—二叠系沉积环境(包括氧化还原条件、古气候及陆源碎屑)进行了分析，并进一步探究其对有机质富集的控制作用。结果表明，研究区山西组和太原组泥岩样品有机碳含量介于0.31%～5.97%(均值2.87%)，而石盒子组为0.09%～2.75%(均值0.72%)。太原组至石盒子组样品Sr/Cu和Mg/Ca值偏低，Fe/Mn值较高，指示该沉积时期整体属于温暖潮湿气候，氧化还原敏感元素(RSEs)指标V/(V+Ni)和Ce/La均值分别为0.75、1.93，呈现缺氧环境特征。TOC值与Sr/Cu、Fe/Mn等气候指标相关性很弱，当TOC值小于1，与氧化还原敏感元素(RSEs)无明显相关性；当TOC值大于1，TOC和Al、RSEs元素之间分别存在显著正相关性。上述表明太原组和山西组有机质富集主要受水体氧化还原条件和陆源碎屑控制，石盒子组沉积时期受鄂尔多斯盆地东缘晚古生代海退趋势影响，由浅海陆棚相过渡为海陆过渡相，处于动水、高能环境，有机质不易富集保存。
Abstract:BACKGROUND In the past two decades, with the development of CBM technology, the reduction of recoverable resources in shallow coalbed methane and the consumption of unconventional natural gas in China increasing year by year, the development of deep coalbed methane is imperative. The coalbed methane resources in China are about 30.05×1012m3, and the coalbed methane resource within the burial depth range from 1000m to 2000m is about 18.87×1012m3, accounting for 62.8% of the total resources, which reflects that deep coalbed methane is an important resource foundation for the large-scale development of China’s coalbed methane industry. As the second largest petroliferous basin in China, the Ordos basin has great potential for exploration of deep coalbed methane. In the Eastern Ordos Basin, the coalbed methane resource less than 1500m in depth is about 9×1012m3. Although the eastern edge of the Ordos Basin is rich in deep coalbed methane and tight sandstone gas, the enrichment characteristics and controlling factors of organic matter in coal-bearing strata are unclear, which is not conducive to the study on the storage law of resource, evaluation of development potential, and selection of favorable areas.
OBJECTIVES To reveal the organic carbon content and its influencing factors of mudstones in the coal measure strata and guide the efficient development of coal-measure gas in the eastern margin of the Ordos Basin.
METHODS (1) Analytical method: A total of 26 mudstone samples from the Shihezi, Shanxi and Taiyuan Formations were collected in the Shixi area. The content of major and trace elements, organic carbon content and clay mineral characteristics were tested by XRF, ICP-MS and SEM. Carbon isotope of Kerogen was determined by gas chromatography-isotope ratio mass spectrometry (GC-IRMS). The working standard of carbon isotope adopted the international standard PDB. (2) The mode of organic matter enrichment: Based on the experimental results, the Carboniferous—Permian sedimentary environment (including redox conditions, paleoclimate and terrigenous clastic characteristics) was studied with geochemical indicators, then correlation between sedimentary environment and organic matter content was further explored.
RESULTS (1) Organic and elemental geochemical characteristics of muddy source rocks. Compared with the data of major elements in the upper crust of the North China Plate, the Carboniferous—Permian mudstone samples in the study area show significant enrichment of Al2O3 and TiO2, and Al2O3/SiO2 value ranges from 0.11 to 0.58 (mean value is 0.37), indicating that the sample has a high content of clay minerals. The trace elements are significant enrichment of Li and Cs, slight depletion of Sr, and significant depletion of Zn and Ba. Rare earth elements are highly enriched overall (mean value is 475.4μg/g), and higher than UCC (174.074μg/g) and PAAS (211.78μg/g). The organic carbon content of mudstone samples from the Shanxi and Taiyuan Formations in study area is relatively high (mean value is 2.87%), while the Shihezi Formation is relatively low (mean value is 0.72%). (2) Redox-sensitive elements, mainly including Mo, V, U, Ni, Ce and La, are important indicators for characterizing the oxidation environment of sedimentary water bodies. V/(V+Ni) values range from 0.61 to 0.89 (mean value is 0.75), and the differentiation of each layer is not obvious (mean value of Shihezi Formation is 0.79, Shanxi Formation is 0.74, Taiyuan Formation is 0.78), and Ce/La values range from 1.55-2.3 (mean value is 1.93). The above indicators exhibit the characteristics of a poor oxygen environment. The corrected CIA index ranges from 85 to 100, reflecting the strong weathering of parent rock in the source area under a hot-humid environment. Besides, the Sr/Cu and Mg/Ca values of the sample range from 3.16 to 24.89 (mean value is 7.43) and 0.34 to 7.98 (mean value is 2.91), respectively. Fe/Mn values range from 21.35455 to 545.72 (mean value is 202.25), indicating a warm and humid climate during the late Paleozoic. The clay mineral content in the terrestrial debris of the sample is relatively high, which consists mainly of kaolinite (mean value is 39.27%) and illite (mean value is 28.54%). (3) The sedimentary period from the Taiyuan Formation to the Shihezi Formation belongs to a warm and humid climate as a whole, and the bottom of the sedimentary water body is in an anoxic environment. There was no significant correlation among climatic indices of Sr/Cu, Mg/Ca, Fe/Mn and TOC values, however, when the TOC value was more than 1, it was significantly positively correlated with Al and redox sensitive elements (RSEs).
CONCLUSIONS The enrichment of organic matter in the argillaceous rock of the Taiyuan Formation and Shanxi Formation is controlled mainly by water redox conditions and terrigenous debris. The Shihezi Formation inherites the regressive trend of the eastern margin of the Ordos Basin in the late Paleozoic, and its sedimentary environment changes from shallow shelf to marine-continental transitional facies, causing a dynamic ambient and high energy circumstance, in which organic matter is not easily enriched and preserved.
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表 1 石西地区泥岩样品主量元素、有机碳含量及碳同位素值
Table 1. Concentrations of major elements, TOC value and δ13C (PDB) of mudstone samples in Shixi area.
样品编号 层位 岩性 SiO2
(%)Al2O3
(%)MgO
(%)CaO
(%)TFe2O3
(%)Na2O
(%)K2O
(%)MnO
(%)TiO2
(%)P2O5
(%)δ13C(PDB)
(‰)TOC
(%)SX-01-2 上石盒子组 深灰色泥岩 54.75 20.70 1.51 0.63 6.02 0.47 2.24 0.052 0.83 0.17 −23.7 2.75 SX-01-4 深灰色泥岩 57.09 23.22 1.35 0.27 4.10 0.52 2.77 0.021 0.75 0.06 −23.6 0.40 SX-01-5 灰黑色泥岩 58.26 22.40 1.08 0.27 3.38 0.50 2.98 0.024 0.67 0.06 −23.9 0.53 SX-01-10 下石盒子组 深灰色泥岩 79.36 8.77 0.36 0.44 0.51 0.11 0.56 0.026 1.53 0.09 −25.0 2.54 SX-01-11 深灰色粉砂质泥岩 62.12 18.83 1.38 1.06 1.92 0.42 3.80 0.011 0.86 0.24 −25.5 0.62 SX-02-2 灰绿色粉砂质泥岩 52.51 25.43 1.47 0.43 6.66 0.47 2.46 0.038 0.98 0.08 −24.0 0.14 SX-02-4 灰绿色泥岩 59.71 20.63 1.23 0.38 5.56 0.32 1.93 0.029 0.71 0.07 −24.1 0.16 SX-02-6 深灰色泥岩 58.01 23.08 0.86 0.33 2.76 0.38 4.12 0.009 0.76 0.05 −24.0 0.32 SX-05-1 深灰色泥岩 65.32 22.21 1.06 0.20 2.86 0.48 3.91 0.014 0.76 0.04 −24.0 0.51 SX-06-1 灰绿色泥岩 59.48 20.45 0.93 0.22 6.53 0.34 2.92 0.013 0.62 0.05 −23.7 0.09 SX-06-2 褐棕色泥岩 52.41 19.73 0.99 0.21 13.03 0.29 2.62 0.200 0.86 0.06 −23.9 0.46 SX-07-1 深灰色泥岩 48.86 27.80 1.23 0.30 4.72 0.43 5.37 0.026 1.20 0.10 −24.0 0.14 SX-02-8 山西组 黑色泥岩 58.52 22.60 0.82 0.16 2.08 0.31 1.69 0.013 0.76 0.04 −23.9 3.78 SX-03-1 灰色泥岩 65.00 18.66 1.20 0.29 4.27 0.21 3.29 0.021 0.94 0.05 −23.4 0.31 SX-03-4 灰色泥岩 62.62 22.44 0.54 0.18 1.77 0.20 2.48 0.013 1.02 0.05 −23.8 1.38 SX-04-2 深灰色泥岩 54.40 22.96 1.07 0.12 3.64 0.32 2.23 0.012 0.75 0.02 −24.1 4.04 SX-05-7 深灰色泥岩 63.62 23.68 1.04 0.38 3.22 0.33 2.57 0.106 0.78 0.05 −24.2 1.99 SX-06-4 灰黑色泥岩 58.83 23.59 1.05 0.11 1.31 0.29 2.49 0.004 0.83 0.05 −23.9 1.42 SX-07-2 灰黑色泥岩 61.01 17.82 1.42 0.37 5.08 0.55 2.79 0.063 0.70 0.09 −23.8 2.11 SX-07-3 灰黑色泥岩 54.11 19.72 1.17 0.47 6.70 0.76 3.00 0.092 0.71 0.12 −24.0 2.77 SX-07-5 黑色泥岩 49.01 28.56 0.42 0.19 1.32 0.58 0.79 0.005 0.89 0.06 −24.2 5.97 SX-02-11 太原组 黑色泥岩 65.74 18.44 0.71 0.42 1.60 0.19 1.57 0.028 0.88 0.09 −23.7 2.04 SX-04-4 灰黑色泥岩 55.94 24.27 0.32 0.80 1.56 0.31 1.28 0.019 0.79 0.10 −24.3 3.12 SX-03-6 黑色泥岩 53.97 25.76 0.25 0.23 0.77 0.14 1.07 0.004 0.76 0.04 −23.7 5.31 SX-06-6 深灰色泥岩 58.81 23.11 0.23 0.11 1.96 0.28 1.58 0.009 0.77 0.07 −23.7 2.58 SX-07-7 黑色泥岩 50.51 26.51 0.81 0.38 2.18 0.61 1.92 0.007 0.88 0.08 −23.9 3.63 注：样品编号中的命名含义，如SX-a-b中SX代表石西，“a”代表井号，“b” 代表该井样品序号。
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表 2 石西地区晚古生代泥岩样品微量元素含量
Table 2. Trace element contents of late Paleozoic mudstone samples in Shixi area.
样品编号 微量元素含量(μg/g) Li Sc V Cr Co Ni Cu Zn Ga Rb Sr Mo Cs Ba Tl Th U Nb Ta Zr Hf SX-01-2 54.0 20.6 124 83.0 26.4 36.3 48.4 122 29.3 110 209 0.77 5.33 533 0.67 19.4 3.99 25.6 1.83 295 8.77 SX-01-4 40.2 16.8 78 50.0 20.3 30.4 36.5 127 29.8 129 255 0.45 6.43 779 0.81 17.4 3.34 24.8 1.78 287 9.02 SX-01-5 45.2 18.2 113 65.7 12.2 28.2 30.9 91.8 33.5 164 259 0.41 9.84 890 0.93 18.7 3.57 26.2 1.92 289 8.85 SX-01-10 51.2 8.68 96 50.1 6.03 11.7 11.2 52.2 16.6 22.6 48 2.76 2.32 201 0.28 15.3 2.70 21.5 1.63 546 14.9 SX-01-11 78.6 21.2 129 92.8 6.77 19.8 33.5 34.1 33.6 174 233 0.54 9.87 455 0.85 17.6 2.93 20.7 1.70 269 8.57 SX-02-2 43.3 21.2 88 90.6 17.2 17.2 32.8 84.9 35.0 110 165 0.51 7.54 650 0.77 17.6 3.89 27.9 1.93 544 15.87 SX-02-4 32.6 18.4 98 58.9 15.9 15.9 29.1 77.0 30.3 99.1 148 0.76 6.48 504 0.66 17.6 4.08 23.3 1.65 277 8.25 SX-02-6 27.6 22.5 112 85.4 8.16 8.16 47.2 59.4 32.0 190 216 0.43 11.8 754 1.14 19.5 3.64 23.6 1.80 233 7.23 SX-02-8 52.0 19.7 113 83.3 16.4 16.4 35.6 161 31.2 102 190 1.34 6.42 551 0.70 20.7 4.69 28.3 2.12 320 9.75 SX-02-11 53.1 15.5 91 74.4 15.7 15.7 27.7 64.6 23.8 73.7 186 0.88 5.69 230 0.54 12.8 2.91 18.0 1.34 264 7.91 SX-03-1 27.9 17.5 72 74.4 20.1 20.1 20.1 20.1 25.9 133 127 0.48 5.18 596 0.75 17.6 3.68 23.3 1.64 361 10.1 SX-03-4 47.4 20.7 64 79.3 10.2 10.2 10.2 10.2 32.1 126 117 0.61 7.28 534 0.70 21.0 4.04 28.5 2.11 345 9.84 SX-03-6 88.4 19.1 55 59.0 4.42 4.42 4.42 4.42 32.5 48.6 110 0.94 6.14 174 0.41 14.9 3.32 17.7 1.32 260 7.88 SX-04-2 105 21.2 125 87.3 19.2 42.3 30.5 147 31.0 125 169 1.14 8.21 607 0.88 20.7 4.51 25.8 2.01 250 8.16 SX-04-4 74.3 16.6 73 68.1 7.44 17.6 16.3 71.0 28.5 55.9 141 0.81 5.39 291 0.56 17.0 3.09 19.7 1.37 343 11.3 SX-05-1 30.8 19.8 93 69.0 10.7 24.6 59.9 66.2 27.6 191 189 0.55 10.6 756 1.11 17.2 3.55 19.4 1.42 206 6.58 SX-05-7 51.3 18.2 83 66.9 17.8 30.8 33.2 116 30.9 122 214 1.40 7.05 445 0.71 20.0 3.84 27.0 2.00 274 8.50 SX-06-1 30.2 13.5 61 49.8 11.2 22.0 25.1 77.3 24.4 137 124 0.34 9.84 581 0.80 14.1 2.30 19.7 1.41 238 7.29 SX-06-2 37.4 16.2 83 55.2 14.9 34.7 24.2 95.7 30.4 137 257 0.46 9.12 548 0.81 15.2 3.38 20.4 1.43 246 7.42 SX-06-4 68.0 15.5 85 58.5 6.87 18.9 29.0 47.2 29.3 127 114 1.03 12.6 469 0.73 19.1 3.85 27.3 2.06 322 9.67 SX-06-6 62.1 15.2 73 57.4 15.9 17.7 16.3 76.1 27.3 52.7 149 0.80 4.42 186 0.48 13.0 2.38 16.9 1.16 323 10.2 SX-07-1 24.2 25.5 118 95.3 16.2 29.8 42.1 82.8 34.9 185 252 0.31 5.81 963 1.04 23.0 4.12 32.0 2.35 390 11.9 SX-07-2 29.9 13.0 58 51.1 11.6 21.7 30.2 105 24.1 126 238 1.25 7.67 915 0.71 18.7 3.47 26.0 1.77 264 8.43 SX-07-3 37.0 16.0 72 61.7 17.0 29.6 28.2 80.0 28.4 141 279 1.36 6.72 946 0.86 20.4 4.22 29.9 2.14 369 10.5 SX-07-5 204 15.3 69 60.1 10.0 28.7 16.7 119 34.8 42.7 166 1.36 7.01 308 0.42 21.6 3.77 27.9 2.09 291 9.54 SX-07-7 90.6 21.5 147 94.1 18.9 41.8 33.2 99.5 33.1 119 219 1.81 8.02 601 1.10 24.2 5.56 28.3 2.20 292 9.64
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表 3 石西地区晚古生代泥岩样品稀土元素含量及特征值
Table 3. REY contents and characteristic parameters of late Paleozoic mudstone samples in Shixi area.
样品编号 稀土元素含量(μg/g) L/H (La/Sm)N (Gd/Yb)N (La/Yb)N δCe δEu La Ce Pr Nd Sm Eu Gd Tb Dy Y Ho Er Tm Yb Lu LREY HREY REY SX-01-2 91.4 180 20.3 77.5 13.6 2.95 10.9 1.55 8.56 44.4 1.76 4.71 0.74 4.79 0.74 385.98 77.40 463.38 4.99 0.92 1.08 1.04 0.90 0.98 SX-01-4 85.3 151 20.8 84.4 15.6 2.92 11.2 1.75 10.2 59.4 2.17 5.76 0.89 5.76 0.89 360.46 97.17 457.64 3.71 0.75 0.93 0.80 0.79 0.85 SX-01-5 74.0 148 17.6 68.0 11.8 1.92 9.74 1.63 10.1 56.9 2.16 5.68 0.90 5.70 0.89 320.94 92.84 413.78 3.46 0.86 0.81 0.70 0.87 0.69 SX-01-10 26.2 50.2 6.57 26.1 5.33 1.61 5.15 1.08 6.87 31.9 1.35 3.21 0.49 2.80 0.41 115.99 52.82 168.81 2.20 0.67 0.87 0.51 0.81 1.13 SX-01-11 66.4 128 14.8 55.3 9.01 1.79 7.02 1.00 5.57 30.2 1.15 3.41 0.56 3.76 0.59 275.57 52.66 328.23 5.23 1.01 0.89 0.96 0.87 0.91 SX-02-2 226 446 54.4 213 34.9 7.35 30.0 4.35 23.0 105 4.71 12.4 1.96 13.3 2.09 981.52 194.28 1175.79 5.05 0.89 1.07 0.92 0.85 0.93 SX-02-4 80.1 145 17.8 68.1 11.4 2.07 9.79 1.51 8.59 45.7 1.78 4.92 0.82 5.35 0.85 324.25 78.51 402.76 4.13 0.96 0.87 0.81 0.83 0.78 SX-02-6 116 198 21.6 72.6 9.52 1.51 9.38 1.32 8.02 45.2 1.86 5.32 0.90 5.77 0.94 418.45 77.74 496.19 5.38 1.66 0.77 1.09 0.82 0.67 SX-02-8 104 199 22.2 85.0 14.4 2.51 12.0 1.81 10.1 47.1 2.00 5.18 0.80 5.00 0.74 427.54 83.99 511.53 5.09 0.99 1.14 1.13 0.92 0.76 SX-02-11 50.1 97.9 11.1 42.7 7.23 1.68 6.28 1.00 5.98 30.3 1.20 3.27 0.53 3.39 0.52 210.74 51.93 262.67 4.06 0.95 0.88 0.80 0.90 0.99 SX-03-1 81.8 164 18.6 61.3 11.3 1.69 9.30 1.28 6.96 32.0 1.31 3.96 0.60 4.07 0.61 338.69 59.48 398.17 5.69 0.99 1.09 1.09 0.78 0.68 SX-03-4 105 207 23.2 77.1 15.1 2.25 12.8 1.79 10.7 54.4 2.02 5.81 0.87 5.89 0.84 429.65 94.28 523.93 4.56 0.95 1.03 0.97 0.79 0.67 SX-03-6 85.9 191 21.2 66.2 13.1 2.71 11.3 1.66 10.3 45.6 1.92 5.51 0.84 5.70 0.79 380.11 82.83 462.94 4.59 0.90 0.94 0.82 0.75 0.90 SX-04-2 80.5 158 18.7 71.9 12.3 2.46 10.1 1.51 9.17 48.2 1.94 5.15 0.83 5.25 0.81 343.41 82.15 425.56 4.18 0.90 0.91 0.83 0.87 0.88 SX-04-4 70.5 134 14.7 54.0 8.61 1.55 7.98 1.23 6.86 32.3 1.39 3.53 0.55 3.43 0.51 283.38 57.27 340.65 4.95 1.12 1.10 1.12 0.90 0.76 SX-05-1 63.7 119 12.8 42.8 5.44 0.97 5.42 0.81 5.03 27.4 1.13 3.30 0.57 3.71 0.59 244.61 47.94 292.55 5.10 1.61 0.69 0.93 0.83 0.74 SX-05-7 80.2 161 18.1 67.4 11.1 1.98 9.63 1.48 8.72 47.7 1.82 4.81 0.76 4.81 0.73 339.77 80.43 420.20 4.22 0.99 0.95 0.91 0.88 0.77 SX-06-1 21.4 33.1 4.57 16.5 3.07 0.95 2.82 0.51 3.15 17.6 0.62 1.72 0.29 1.83 0.30 79.54 28.55 108.10 2.79 0.96 0.73 0.63 0.70 1.23 SX-06-2 206 472 62.5 241 39.7 7.74 29.3 3.64 14.9 44.9 2.48 6.51 0.85 5.47 0.80 1028.78 108.10 1136.87 9.52 0.71 2.54 2.04 0.78 0.95 SX-06-4 54.9 103 11.5 42.8 7.52 1.33 6.63 1.05 5.93 28.6 1.15 3.03 0.48 3.03 0.46 220.60 49.95 270.54 4.42 1.00 1.04 0.98 0.88 0.74 SX-06-6 64.5 123 13.8 51.2 7.62 1.52 6.16 0.88 5.05 26.9 1.09 3.15 0.51 3.26 0.51 261.78 47.02 308.79 5.57 1.16 0.90 1.08 0.89 0.90 SX-07-1 268 543 59.2 213 29.0 4.93 26.6 3.38 16.8 95.9 3.75 11.0 1.77 12.18 1.99 1116.67 171.32 1287.99 6.52 1.27 1.04 1.20 0.88 0.76 SX-07-2 69.3 131 14.6 54.0 8.85 1.42 7.72 1.23 7.21 38.4 1.49 3.96 0.63 4.15 0.65 278.67 64.82 343.50 4.30 1.07 0.88 0.91 0.88 0.68 SX-07-3 84.3 172 18.9 71.5 12.0 2.06 9.93 1.53 8.90 48.6 1.86 4.92 0.79 5.38 0.78 360.62 81.93 442.54 4.40 0.96 0.88 0.85 0.91 0.75 SX-07-5 51.2 84.4 9.50 34.1 7.12 2.10 6.60 1.12 6.51 33.8 1.25 3.09 0.49 3.13 0.49 188.43 56.02 244.45 3.36 0.99 1.00 0.89 0.85 1.20 SX-07-7 84.4 174 18.6 67.2 11.0 2.11 9.90 1.64 9.30 44.4 1.87 4.80 0.74 4.66 0.71 357.40 77.32 434.73 4.62 1.06 1.01 0.98 0.90 0.80
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表 4 石西地区泥岩样品黏土矿物组成
Table 4. Clay minerals composition of mudstone samples in Shixi area.
样品编号 黏土矿物相对含量(%) 混合层比例(%S) 样品编号 黏土矿物相对含量(%) 混合层比例(%S) S I/S I K C C/S I/S C/S S I/S I K C C/S I/S C/S SX-01-2 − 21 24 44 11 − 20 − SX-04-2 − 7 40 41 12 − 5 − SX-01-4 − 50 21 22 7 − 25 − SX-04-4 − 2 23 75 − − 5 − SX-01-5 − 40 28 25 7 − 20 − SX-05-1 − 45 32 18 5 − 15 − SX-01-10 − 6 18 76 − − 10 − SX-05-7 − 23 34 43 − − 10 − SX-01-11 − 26 57 17 − − 10 − SX-06-1 − 38 23 21 18 − 15 − SX-02-2 − 36 16 37 11 − 20 − SX-06-2 − 20 34 22 24 − 10 − SX-02-4 − 29 15 41 15 − 25 − SX-06-4 − 22 30 48 − − 10 − SX-02-6 − 45 30 19 6 − 15 − SX-06-6 − 24 18 58 − − 15 − SX-02-8 − 16 30 42 12 − 10 − SX-07-1 − 38 40 16 6 − 10 − SX-02-11 − 15 30 55 − − 10 − SX-07-2 − 47 34 14 5 − 15 − SX-03-1 − 46 28 26 − − 15 − SX-07-3 − 47 37 16 − − 15 − SX-03-4 − 29 28 43 − − 15 − SX-07-5 − 10 20 70 − − 10 − SX-03-6 − 12 22 66 − − 10 − SX-07-7 − 4 30 66 − − 5 − 注：K—高岭石；C—绿泥石；I—伊利石；S—蒙皂石；I/S—伊/蒙间层；C/S—绿/蒙间层；%S—间层比。“—”表示实验未检出。
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