海相高过成熟页岩芳烃特征及页岩气意义

王保忠; 王传尚; 汪啸风; 彭中勤; 危凯

doi:10.3799/dqkx.2019.143

Volume 44 Issue 11

Nov. 2019

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Wang Baozhong, Wang Chuanshang, Wang Xiaofeng, Peng Zhongqin, Wei Kai, 2019. Characteristics of Aromatic Compounds in High-over Matured Marine Shale and Its Significance to Shale Gas. Earth Science, 44(11): 3705-3716. doi: 10.3799/dqkx.2019.143

Citation:

Wang Baozhong, Wang Chuanshang, Wang Xiaofeng, Peng Zhongqin, Wei Kai, 2019. Characteristics of Aromatic Compounds in High-over Matured Marine Shale and Its Significance to Shale Gas. Earth Science, 44(11): 3705-3716. doi: 10.3799/dqkx.2019.143

Citation:

Wang Baozhong, Wang Chuanshang, Wang Xiaofeng, Peng Zhongqin, Wei Kai, 2019. Characteristics of Aromatic Compounds in High-over Matured Marine Shale and Its Significance to Shale Gas. Earth Science, 44(11): 3705-3716. doi: 10.3799/dqkx.2019.143

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Characteristics of Aromatic Compounds in High-over Matured Marine Shale and Its Significance to Shale Gas

doi: 10.3799/dqkx.2019.143

1.
Stratigraphic Paleontology Laboratory, Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Key Laboratory of Paleontology and Life-Environment Co-Evolution of China Geological Survey, Wuhan 430205, China

Received Date: 2019-06-16
Publish Date: 2019-11-15

Abstract

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 _RmcR_o=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 Although the formula for maturity of methylphenanthrene is no longer applicable in this stage, the parameter F₁ which characterizes the relative content of 3-MP+2-MP is still a good maturity index of organic matter.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(R_o=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 _RmcR_o=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.
- aromatic hydrocarbon,
- phenanthrene series,
- thermal maturity,
- Raman spectra,
- shale gas,
- petroleum geology

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Characteristics of Aromatic Compounds in High-over Matured Marine Shale and Its Significance to Shale Gas

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