Kinetic parameters of methane generated from source rocks and their application in the Kuqa Depression of the Tarim Basin

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Authors:Li Xianqing; Xiao Xianming; Mi Jingkui; Tang, Yongchun; Xiao Zhongyao; Liu Dehan; Shen Jiagui; Liu Jingzhong
Author Affiliations:Primary:
Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Guangzhou, China
Other:
California Institute of Technology, United States
Tarim Oilfield, China
China University of Mining and Technology, China
Volume Title:Dizhixue Bao Acta Geologica Sinica
Source:Dizhixue Bao = Acta Geologica Sinica, 79(1), p.133-142. Publisher: Science Press, Beijing, China. ISSN: 0001-5717
Publication Date:2005
Note:In Chinese with English summary. 55 refs.; illus., incl. 2 tables
Summary:In a thermal simulation experiment using cold-system, gold tube, high-pressure vessels under a given pressure (50 MPa) and with calculations performed with the specific Kinetics and GOR-Isotope Kinetics software, the kinetic parameters of gas generation and methane carbon isotopes from Triassic-Jurassic source rocks in the Kuqa Depression of the Tarim Basin were determined. The ranges of activation energies of methane from Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression are 197-268 kJ/mol, 180-260 kJ/mol, and 214-289 kJ/mol, respectively. Their frequency ratios are 5.265x1013/s, 9.761xl011/s, and 2.270x1014/s. This suggests that there are different activation energies and frequency ratios for methane generated from Jurassic coal, coal-associated mudstone, and Triassic mudstone in the Kuqa Depression, which reflect differences in hydrocarbon generation behaviors. The kinetic parameters of methane carbon isotopes are also different in Jurassic coal, Jurassic mudstone, and Triassic mudstone. Their average activation energies were 228 kJ/mol, 205 kJ/mol, and 231 kJ/mol, respectively. Based on this research, combined with the geological background, the origin of natural gas in the Yinan 2 gas pool is further discussed using these kinetic parameters, and a model of its gas accumulation model is established. The natural gas of the Yinan 2 gas pool was primarily derived from Jurassic coal-bearing source rocks at the center of the Yangxia Sag and generally can be classified as staged accumulative gas. The Yinan 2 gas was mainly accumulated at 5-0 Ma with a R0 of 1.25%-1.95% and a loss of about 25%-30%.
Sections:Geochemistry
Subsections:Organic geochemistry
Subjects:Aliphatic hydrocarbons; Alkanes; Biomarkers; Clastic rocks; Hydrocarbons; Kinetics; Methane; Migration; Mudstone; Organic compounds; Petroleum; Petroleum accumulation; Petroleum exploration; Pyrolysis; Sedimentary rocks; Source rocks; Asia; China; Far East; Kuqa Depression; Tarim Basin; Xinjiang China
Coordinates:N414500 N414500 E0830000 E0830000
Abstract Numbers:05M/2985
Record ID:2014076778
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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