The Method of Determination of Aliphatic Content in Kerogen by Quantitative FT-IR and Its Petroleum Geology Significance

ZHANG Xue jun; YAN Xiao hu; LI Pei zhen; MIAO De yu; HU Wen huan; LIU Qing

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Article Navigation > Acta Sedimentologica Sinica > 2004 > 22(4): 711-717

ZHANG Xue jun, YAN Xiao hu, LI Pei zhen, MIAO De yu, HU Wen huan, LIU Qing. The Method of Determination of Aliphatic Content in Kerogen by Quantitative FT-IR and Its Petroleum Geology Significance[J]. Acta Sedimentologica Sinica, 2004, 22(4): 711-717.

Citation:

The Method of Determination of Aliphatic Content in Kerogen by Quantitative FT-IR and Its Petroleum Geology Significance

1.
Geological Science Research Institute, Shengli Petroleum Administration, Dongying, Shandong 257015;
2.
Department of Earth Science Nanjing University, Nanjing 210093

Received Date: 2003-09-20
Rev Recd Date: 2004-05-12
Publish Date: 2004-12-10

Abstract

A new method is developed to determine aliphatic content of kerogen using quantitative Fourier transform infrared spectra. The method uses micritic paraffin as reference standards, which consist of pure aliphatic chains. To discuss the experimental factors that may influence the result, different concentration of kerogen sample and fixed concentration of sample mixing with rock detriments or silicon mineral are analyzed respectively. The results indicate that the mixing minerals and rocks have little influence on the analytical results, in while high concentration of kerogens have much influence and should not exceed 3.5 mg when preparing the sample. So the quantitative method is reproducible, accurate and reliable. The simulating experiment is an important method in studying the evolution of organic matter, while studying natural evolving section is another. So kerogens in simulated samples and natural evolving samples in Dongying Depression are analyzed according to our quantitative method. After comparing the aliphatic contents of kerogens with different organic matter types, maturities and potentials of hydrocarbon, the author conclude that the aliphatic content obtained by FT IR can be a new index for evaluating hydrocarbon source rocks. The aliphatic content is determined by kerogen type under low maturity. The aliphatic contents often are higher than 20% in type Ⅰ kerogens, from 5% to 20% in type Ⅱ kerogens and below 5% in type Ⅲ kerogens, but with the same kerogen type the aliphatic content is determined by maturity. In low maturity the aliphatic content doesn't transform apparently, while in “oil window” the aliphatic content decrease faster and the aliphatic content will be near to naught over the "oil window". The relationship between aliphatic content and hydrocarbon/Toc indicated that the simulating and natural samples followed a slightly different evolving path if comparing the aliphatic content with the chroloform "A".
- kerogen,
- quantitative FT-IR,
- aliphatic content,
- maturity,
- source rock experimental simulation.,

References

[1]	Behar F and Vandenbroucke M. Chemical modelling of kerogens. Organic Geochemistry, 1987, 11:15～24
[2]	Faulon J F, Vandenbroucke M, Drappier J M, et al. 3D Chemical model for geological macromolecules. Organic Geochemistry, 1990, 16: 981～993
[3]	Jose V Ibarra, Edgar Munoz and Rafael Moliner. FTIR study of the evolution of coal structure during the coalification process. Organic Geochemistry, 1996, 24: 725～735
[4]	Painter P, Sobkowiak M, Heidary S, Coleman M. Current status of FTIR in the analysis of coal structure. Am. Chem.Soc. Div. Fuel Chem., 1994, 39(1): 49～53
[5]	Roxhet P G, Robin P L, Nicaise G. Characterization of kerogens and of their evaluation by infrared spectroscopy. In: Durand B, ed. Kerogen, Editions Technip-Paris, 1980. 163～189
[6]	Landiais P and Rochdi A. Reliability of semi-quantitative data extracted from transmission microscopy Fourier transform infrared spectra of coal. Energy & Fuels, 1990, 4(3): 290～295
[7]	Oberlin A, Boulmier J L, Villay M. Electron microscopy studies of kerogen micro-structure. In: Durand B, ed. Kerogen. 1980. 218～294
[8]	傅家谟, 秦匡宗. 干酪根地球化学. 广州:广东科技出版社,1995[Fu Jiamo, Qing Kuangzong. Kerogen Geochemistry. Guangzhou: Guangdong Science & Technology Press, 1995]
[9]	Ganz H and kalkrenth W. kerogen-type and the evaluation of source rock and oil shale potentials. Fuel, 1987, 66:708～711
[10]	Ganz H,and Kalkreuth W. The potential of infrared spectroscopy for the classification of kerogen,coal and bituem. Wissenschaft & Technik, 1990, 43(3): 116～117
[11]	Landais P, Rochdi A. Reliability of Semi-quantitative data extracted from transmission microscopy-fuorier transform infrared spectra of coal. Energy & Fuels, 1990, 4(3):290～295
[12]	杜朗B主编. 干酪根--沉积岩中的不溶有机质. 石油实验地质编委会[Dulang B ed. Kerogen- insoluable matter in sedimentary rock. Committee of Petroleum and Geology]
[13]	王宗贤,刘雁来,等. 用红外光谱表征干酪根和煤的芳碳量. 石油大学学报(自然科学版),1992,16(4):66～71[Wang Zongxian, Liu Yanlai, et al., Description of kerogen and aromaticcarbon amount using ultra red spectra. Journal of Petroleum University(Natural Science), 1992,16(4):66～71]
[14]	蒙琪,孙启帮. 应用红外光谱法划分生油岩有机质类型. 石油实验地质,1985,7(3):193～189[Meng Qi, Sun Qibang. Classification of source rock organic matter type using ultra red spectra. Petroleum Experimental Geology, 1985,7(3):193～189]
[15]	杨志琼,章玲. 利用红外光谱剖析干酪根三类主要原子团的演化. 石油与天然气地质,1989,10(1):53～58[Yang Zhiqiong, Zhang Ling. Analysis on the evolution of three main atomic groups in kerogen by use of ultra red spectra. Oil & Gas Geology, 1989,10(1):53～58]
[16]	Ganz H, Kalkreuth W. Application of infrared spectroscopy to the classification of kerogen type and the evaluation of source rock and oil shale potentials. Fuel, 1987, 66: 708～711
[17]	Kister J, Guiliano M, Largeau C, Deronne S and Casadevall E. Characterization of chemical structure, degree of maturation and oil potential of torbanites (type I kerogens) by quantitative FTIR spectroscopy. Fuel, 1990, 69: 1356～1361
[18]	黄第藩,李晋超,王会祥. 在成烃作用中干酪根的结构演化图解. 科学通报, 1987,(16):1226～1229[Huang Difan, Li Jinchao, Wang Huixiang. Figuration of structural evolution of kerogen during hydrocarbon generation. Chinese Science Bulletin, 1987,(16):1226～1229]
[19]	王新洲,宋一涛,王学军. 石油成因与排油物理模拟--方法、机理及应用. 山东东营: 石油大学出版社,1996[Wang Xinzhou, Wang Xuejun. Origin of petroleum and oil expulsion physical simulation-method, mechanism and application. Dongying Shandong: Petroleum University Press, 1996]

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The Method of Determination of Aliphatic Content in Kerogen by Quantitative FT-IR and Its Petroleum Geology Significance

1. Geological Science Research Institute, Shengli Petroleum Administration, Dongying, Shandong 257015;

2. Department of Earth Science Nanjing University, Nanjing 210093

Received Date: 2003-09-20

Rev Recd Date: 2004-05-12

Publish Date: 2004-12-10

Key words:

Abstract: A new method is developed to determine aliphatic content of kerogen using quantitative Fourier transform infrared spectra. The method uses micritic paraffin as reference standards, which consist of pure aliphatic chains. To discuss the experimental factors that may influence the result, different concentration of kerogen sample and fixed concentration of sample mixing with rock detriments or silicon mineral are analyzed respectively. The results indicate that the mixing minerals and rocks have little influence on the analytical results, in while high concentration of kerogens have much influence and should not exceed 3.5 mg when preparing the sample. So the quantitative method is reproducible, accurate and reliable. The simulating experiment is an important method in studying the evolution of organic matter, while studying natural evolving section is another. So kerogens in simulated samples and natural evolving samples in Dongying Depression are analyzed according to our quantitative method. After comparing the aliphatic contents of kerogens with different organic matter types, maturities and potentials of hydrocarbon, the author conclude that the aliphatic content obtained by FT IR can be a new index for evaluating hydrocarbon source rocks. The aliphatic content is determined by kerogen type under low maturity. The aliphatic contents often are higher than 20% in type Ⅰ kerogens, from 5% to 20% in type Ⅱ kerogens and below 5% in type Ⅲ kerogens, but with the same kerogen type the aliphatic content is determined by maturity. In low maturity the aliphatic content doesn't transform apparently, while in “oil window” the aliphatic content decrease faster and the aliphatic content will be near to naught over the "oil window". The relationship between aliphatic content and hydrocarbon/Toc indicated that the simulating and natural samples followed a slightly different evolving path if comparing the aliphatic content with the chroloform "A".

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Reference (19)

[1]	Behar F and Vandenbroucke M. Chemical modelling of kerogens. Organic Geochemistry, 1987, 11:15～24
[2]	Faulon J F, Vandenbroucke M, Drappier J M, et al. 3D Chemical model for geological macromolecules. Organic Geochemistry, 1990, 16: 981～993
[3]	Jose V Ibarra, Edgar Munoz and Rafael Moliner. FTIR study of the evolution of coal structure during the coalification process. Organic Geochemistry, 1996, 24: 725～735
[4]	Painter P, Sobkowiak M, Heidary S, Coleman M. Current status of FTIR in the analysis of coal structure. Am. Chem.Soc. Div. Fuel Chem., 1994, 39(1): 49～53
[5]	Roxhet P G, Robin P L, Nicaise G. Characterization of kerogens and of their evaluation by infrared spectroscopy. In: Durand B, ed. Kerogen, Editions Technip-Paris, 1980. 163～189
[6]	Landiais P and Rochdi A. Reliability of semi-quantitative data extracted from transmission microscopy Fourier transform infrared spectra of coal. Energy & Fuels, 1990, 4(3): 290～295
[7]	Oberlin A, Boulmier J L, Villay M. Electron microscopy studies of kerogen micro-structure. In: Durand B, ed. Kerogen. 1980. 218～294
[8]	傅家谟, 秦匡宗. 干酪根地球化学. 广州:广东科技出版社,1995[Fu Jiamo, Qing Kuangzong. Kerogen Geochemistry. Guangzhou: Guangdong Science & Technology Press, 1995]
[9]	Ganz H and kalkrenth W. kerogen-type and the evaluation of source rock and oil shale potentials. Fuel, 1987, 66:708～711
[10]	Ganz H,and Kalkreuth W. The potential of infrared spectroscopy for the classification of kerogen,coal and bituem. Wissenschaft & Technik, 1990, 43(3): 116～117
[11]	Landais P, Rochdi A. Reliability of Semi-quantitative data extracted from transmission microscopy-fuorier transform infrared spectra of coal. Energy & Fuels, 1990, 4(3):290～295
[12]	杜朗B主编. 干酪根--沉积岩中的不溶有机质. 石油实验地质编委会[Dulang B ed. Kerogen- insoluable matter in sedimentary rock. Committee of Petroleum and Geology]
[13]	王宗贤,刘雁来,等. 用红外光谱表征干酪根和煤的芳碳量. 石油大学学报(自然科学版),1992,16(4):66～71[Wang Zongxian, Liu Yanlai, et al., Description of kerogen and aromaticcarbon amount using ultra red spectra. Journal of Petroleum University(Natural Science), 1992,16(4):66～71]
[14]	蒙琪,孙启帮. 应用红外光谱法划分生油岩有机质类型. 石油实验地质,1985,7(3):193～189[Meng Qi, Sun Qibang. Classification of source rock organic matter type using ultra red spectra. Petroleum Experimental Geology, 1985,7(3):193～189]
[15]	杨志琼,章玲. 利用红外光谱剖析干酪根三类主要原子团的演化. 石油与天然气地质,1989,10(1):53～58[Yang Zhiqiong, Zhang Ling. Analysis on the evolution of three main atomic groups in kerogen by use of ultra red spectra. Oil & Gas Geology, 1989,10(1):53～58]
[16]	Ganz H, Kalkreuth W. Application of infrared spectroscopy to the classification of kerogen type and the evaluation of source rock and oil shale potentials. Fuel, 1987, 66: 708～711
[17]	Kister J, Guiliano M, Largeau C, Deronne S and Casadevall E. Characterization of chemical structure, degree of maturation and oil potential of torbanites (type I kerogens) by quantitative FTIR spectroscopy. Fuel, 1990, 69: 1356～1361
[18]	黄第藩,李晋超,王会祥. 在成烃作用中干酪根的结构演化图解. 科学通报, 1987,(16):1226～1229[Huang Difan, Li Jinchao, Wang Huixiang. Figuration of structural evolution of kerogen during hydrocarbon generation. Chinese Science Bulletin, 1987,(16):1226～1229]
[19]	王新洲,宋一涛,王学军. 石油成因与排油物理模拟--方法、机理及应用. 山东东营: 石油大学出版社,1996[Wang Xinzhou, Wang Xuejun. Origin of petroleum and oil expulsion physical simulation-method, mechanism and application. Dongying Shandong: Petroleum University Press, 1996]

The Method of Determination of Aliphatic Content in Kerogen by Quantitative FT-IR and Its Petroleum Geology Significance

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