Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China
The Lower Permian Shanxi Formation marine–continental transitional organic-rich shale is one of the most important potential shale gas plays in the Ordos Basin, China. However, the content and origin of desorbed gas from the Shanxi Formation are poorly documented, limiting the understanding of gas g...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2017-11-01
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| Series: | Energy Exploration & Exploitation |
| Online Access: | https://doi.org/10.1177/0144598717723564 |
| _version_ | 1818400160599769088 |
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| author | Zepeng Sun Yongli Wang Zhifu Wei Mingfeng Zhang Gen Wang Zixiang Wang |
| author_facet | Zepeng Sun Yongli Wang Zhifu Wei Mingfeng Zhang Gen Wang Zixiang Wang |
| author_sort | Zepeng Sun |
| collection | DOAJ |
| description | The Lower Permian Shanxi Formation marine–continental transitional organic-rich shale is one of the most important potential shale gas plays in the Ordos Basin, China. However, the content and origin of desorbed gas from the Shanxi Formation are poorly documented, limiting the understanding of gas generation and potential play elements. Geochemical characteristics of desorbed gas, including content and origin, are analyzed from 17 core samples of the Shanxi Formation from well SL-1. The results show that the Shanxi Formation shales in the study area are characterized by high total organic carbon content of 1.17–2.63%, type III organic matter, and high T max between 493 and 513℃. The desorbed gas content of the shale samples varies from 0.22 to 0.50 m 3 /t, with an average of 0.37 m 3 /t, and shows a positive correlation with total organic carbon. The gases are dominated by methane (69.57–89.02%), with small amounts of ethane (0.01–0.09%). The carbon isotopic signature δ 13 C 1 ranges from −49.5 to −45.3‰, and the δ 13 C 2 ranges from −23.3 to −14.7‰. In addition, gases released from the Shanxi Formation core samples are thermogenic in origin and possibly coal derived, as the Whiticar chart and the diagram of ethane versus δ 13 C 2 suggest. |
| first_indexed | 2024-12-14T07:32:10Z |
| format | Article |
| id | doaj.art-486baf5116c341bfb7405fbb0dd69209 |
| institution | Directory Open Access Journal |
| issn | 0144-5987 2048-4054 |
| language | English |
| last_indexed | 2024-12-14T07:32:10Z |
| publishDate | 2017-11-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Energy Exploration & Exploitation |
| spelling | doaj.art-486baf5116c341bfb7405fbb0dd692092022-12-21T23:11:19ZengSAGE PublishingEnergy Exploration & Exploitation0144-59872048-40542017-11-013510.1177/0144598717723564Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, ChinaZepeng Sun0Yongli Wang1Zhifu Wei2Mingfeng Zhang3Gen Wang4Zixiang Wang5University of Chinese Academy of Sciences, Beijing, ChinaKey Laboratory of Petroleum Resources, Gansu Province/ Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, ChinaKey Laboratory of Petroleum Resources, Gansu Province/ Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, ChinaKey Laboratory of Petroleum Resources, Gansu Province/ Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, ChinaUniversity of Chinese Academy of Sciences, Beijing, ChinaResearch Institute of Exploration and Development, Jianghan Oilfield Branch Company “SINOPEC,” Wuhan, ChinaThe Lower Permian Shanxi Formation marine–continental transitional organic-rich shale is one of the most important potential shale gas plays in the Ordos Basin, China. However, the content and origin of desorbed gas from the Shanxi Formation are poorly documented, limiting the understanding of gas generation and potential play elements. Geochemical characteristics of desorbed gas, including content and origin, are analyzed from 17 core samples of the Shanxi Formation from well SL-1. The results show that the Shanxi Formation shales in the study area are characterized by high total organic carbon content of 1.17–2.63%, type III organic matter, and high T max between 493 and 513℃. The desorbed gas content of the shale samples varies from 0.22 to 0.50 m 3 /t, with an average of 0.37 m 3 /t, and shows a positive correlation with total organic carbon. The gases are dominated by methane (69.57–89.02%), with small amounts of ethane (0.01–0.09%). The carbon isotopic signature δ 13 C 1 ranges from −49.5 to −45.3‰, and the δ 13 C 2 ranges from −23.3 to −14.7‰. In addition, gases released from the Shanxi Formation core samples are thermogenic in origin and possibly coal derived, as the Whiticar chart and the diagram of ethane versus δ 13 C 2 suggest.https://doi.org/10.1177/0144598717723564 |
| spellingShingle | Zepeng Sun Yongli Wang Zhifu Wei Mingfeng Zhang Gen Wang Zixiang Wang Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China Energy Exploration & Exploitation |
| title | Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China |
| title_full | Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China |
| title_fullStr | Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China |
| title_full_unstemmed | Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China |
| title_short | Characteristics and origin of desorption gas of the Permian Shanxi Formation shale in the Ordos Basin, China |
| title_sort | characteristics and origin of desorption gas of the permian shanxi formation shale in the ordos basin china |
| url | https://doi.org/10.1177/0144598717723564 |
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