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New insights into the role of system sealing capacity in shale evolution under conditions analogous to geology: Implications for organic matter evolution and petroleum generation
Song, Dongjun1,2,3; Tuo, Jincai3; Dai, Shuang1,2; Wu, Chenjun4; Sun, Lina5; Zhang, Mingfeng3; Su, Long3
2022-06-01
Source PublicationMARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
Volume140Pages:15
AbstractClosed and semi-closed pyrolysis of a lacustrine shale sample were conducted using the same instrument characterized by lithostatic pressure and limited reactive space in order to unravel the impacts of system sealing capacity on organic matter evolution and hydrocarbon generation in shales under conditions analogous to natural processes. The products and solid residues were subjected to chemical composition determination, gaseous carbon isotopic composition analysis, solvent extraction, and Rock-Eval pyrolysis. Higher organic matter transformation and oil retention contents were obtained at 300-500 degrees C in the closed pyrolysis system compared to those in the semi-closed system at the same temperature ranges. However, lower yields of hydrocarbons except for methane were obtained in the closed system at this temperature range, while the iso-/n-C-4,C-5 as well as C-1/C1-5 values were significantly higher in this system. Stronger recombined reactions between kerogen and hydrocarbons were proposed to occur at 300-500 degrees C during the closed pyrolysis process, leading to the consumption of oil and hydrocarbon gases. Ultimately, positive deviations of initially more negative delta C-13(2 similar to 3) values were occurred in the closed system, resulting in similar delta C-13(2 similar to 3) values from the two systems before secondary cracking of hydrocarbon gases commences, but the delta C-13(1) value from the closed system was overall more negative. Different water retention ratios and hydrocarbon expulsion efficiencies induced by system sealing capacity are the predominant factor controlling organic matter evolution and petroleum generation during the pyrolysis processes. This highlights that the different gas contents of the Cambrian and Silurian shales in South China may be associated with the differences in the system sealing capacities of shales, although the sedimentary environment of the studied sample is lacustrine, and the lower methane content of the Cambrian shale gas is probably ascribed to semi-closed system. Finally, a higher ratio of oil cracking gas may be an important signal for natural gas systems that have better exploration potential.
KeywordLimited reactive space Lithostatic pressure Closed system Semi-closed system Shale gas content
DOI10.1016/j.marpetgeo.2022.105659
Funding OrganizationNational Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program
WOS KeywordHYDROCARBON SOURCE ROCKS ; GAS GENERATION ; WATER-PRESSURE ; BARNETT SHALE ; OIL CRACKING ; NATURAL-GAS ; ORDOS BASIN ; MISSISSIPPIAN BARNETT ; LABORATORY PYROLYSIS ; ISOTOPE COMPOSITIONS
Language英语
Funding ProjectNational Natural Science Foun-dation of China of China[41672127] ; National Natural Science Foun-dation of China of China[41972213] ; Key Laboratory of Petroleum Resources Research, Gansu Province[SZDKFJJ20211003] ; Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0704]
Funding OrganizationNational Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foun-dation of China of China ; National Natural Science Foun-dation of China of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Key Laboratory of Petroleum Resources Research, Gansu Province ; Second Tibetan Plateau Scientific Expedition and Research Program ; Second Tibetan Plateau Scientific Expedition and Research Program
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000793130300001
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105929
Collection兰州油气中心
Corresponding AuthorTuo, Jincai
Affiliation1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
2.Lanzhou Univ, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
4.Yangtze Univ, Coll Resources & Environm, Wuhan 430100, Peoples R China
5.Yangtze Univ, Hubei Cooperat Innovat Ctr Unconvent Oil & Gas, Wuhan 430100, Peoples R China
Recommended Citation
GB/T 7714
Song, Dongjun,Tuo, Jincai,Dai, Shuang,et al. New insights into the role of system sealing capacity in shale evolution under conditions analogous to geology: Implications for organic matter evolution and petroleum generation[J]. MARINE AND PETROLEUM GEOLOGY,2022,140:15.
APA Song, Dongjun.,Tuo, Jincai.,Dai, Shuang.,Wu, Chenjun.,Sun, Lina.,...&Su, Long.(2022).New insights into the role of system sealing capacity in shale evolution under conditions analogous to geology: Implications for organic matter evolution and petroleum generation.MARINE AND PETROLEUM GEOLOGY,140,15.
MLA Song, Dongjun,et al."New insights into the role of system sealing capacity in shale evolution under conditions analogous to geology: Implications for organic matter evolution and petroleum generation".MARINE AND PETROLEUM GEOLOGY 140(2022):15.
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