| 海相高过成熟页岩芳烃特征及页岩气意义 |
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| 引用本文： | 王保忠,王传尚,汪啸风,彭中勤,危凯.海相高过成熟页岩芳烃特征及页岩气意义[J].地球科学,2019,44(11):3705-3716. |
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| 作者姓名： | 王保忠 王传尚 汪啸风 彭中勤 危凯 |
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| 作者单位： | 1.武汉地质调查中心地层古生物研究室, 湖北武汉 430205 |
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| 基金项目： | 中国地质调查项目DD20160179 |
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| 摘 要： | 为了合理评价我国南方下古生界页岩有机质热演化程度，研究其与页岩含气性关系；采用气相色谱-质谱联用仪对中扬子地区6口调查井、3个露头剖面的20件页岩样品的芳烃馏分进行了分析，并对代表不同区域的6件样品进行显微激光拉曼测试.分析结果显示拉曼D、G峰参数可以很好地计算过成熟至球粒石墨阶段高演化样品的有机质成熟度；拉曼D峰的子峰包含有芳烃含量的重要信息，随着有机质热演化程度的增加，与芳烃含量有关的D4子峰强度不断降低.芳烃中菲系列化合物和二苯并噻吩系列化合物在RmcRo=2.73%~4.67%范围内的演化具有明显规律性；虽然甲基菲成熟度公式在该阶段已经不适用，但表征3-MP+2-MP相对含量的参数F1仍是很好的有机质成熟度指标；在有机质过成熟演化阶段，F1先随成熟度增加逐渐增加至0.74附近（Ro=3%附近），之后随成熟度增加逐渐减小.二苯并噻吩化合物参数2，4-/1，4-DMDBT和4，6-/1，4-DMDBT在过成熟阶段随成熟度增加而增大，两值分别增至2和4.5时对应页岩等效镜质体反射率为4%.页岩芳烃系列化合物在过成熟阶段随有机质热演化程度增加而发生的异构化作用和脱甲基作用与有机质的比表面积变化有较好的耦合作用，与页岩气调查井的气显情况也有较好的相关性；页岩芳烃特征对过成熟阶段页岩气的生成具有重要的指示意义，可以作为我国南方下古生界有机质过成熟地区页岩气勘探的有效指标.
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| 关 键 词： | 芳香烃 菲系列 热成熟度 拉曼光谱 页岩气 油气地质 |
| 收稿时间： | 2019-06-16 |
Characteristics of Aromatic Compounds in High-over Matured Marine Shale and Its Significance to Shale Gas |
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| Abstract: | In order to evaluate the thermal evolution degree of organic matter of Lower Paleozoic shale in South China and discuss its relationship with shale gas, gas chromatography-mass spectrometry analysis of aromatic compounds in 20 shale samples collected from 6 investigation wells and 3 outcrop profiles in the Central Yangtze region was made, and 6 samples representing different regions were determined by laser Raman spectroscopy. The results show that the parameters of Raman D and G bands can be used to calculate the maturity of organic matter from over-maturity to spheroidal graphite stage. The sub-bands of D band contain important information of aromatics content. The strength of D4 sub-band, which is related to aromatics content, decreases with the increase of thermal evolution degree of organic matter. The evolution regularities of phenanthrene series compounds and dibenzothiophene series compounds are remarkable in the range of RmcRo=2.73%-4.67%. Although the formula for maturity of methylphenanthrene is no longer applicable in this stage, the parameter F1 which characterizes the relative content of 3-MP+2-MP is still a good maturity index of organic matter. F1 gradually increases to about 0.74(Ro=3%) firstly, and then decreases with the increase of maturity at the over-maturity stage. The parameters of dibenzothiophene compounds, 2, 4-/1, 4-DMDBT and 4, 6-/1, 4-DMDBT, increase with maturity at the over-maturity stage. When the two ratios are 2 and 4.5 respectively, the Raman reflectance value of shale is RmcRo=4%. The isomerization and demethylation of aromatic hydrocarbon series compounds occur with the increase of thermal evolution degree of organic matter in the over-mature stage, which has a good coupling effect with the change of specific surface area of organic matter and a good correlation with analytical gas about investigation wells. The characteristics of aromatic hydrocarbon compounds have important indicative significance for shale gas generation at the over-mature stage, and can be used as an effective index for shale gas exploration in over-mature areas of Lower Paleozoic in South China. |
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