Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China
The geochemical characteristics, origin, and source of natural gas in the Dongping–Niudong areas are researched based on the information of components and the stable carbon isotopes of natural gas. The main component of hydrocarbon gas is methane, and C2+ possesses a relatively low content that rang...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2016-12-01
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| Series: | Journal of Natural Gas Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468256X16300785 |
| _version_ | 1797714176581304320 |
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| author | Fei Zhou Yongshu Zhang Zhiqiang Liu Guojie Sui Guoyan Li Caixia Wang Shoukai Cui Yi Zhang Jingru Wang Jun Zhu |
| author_facet | Fei Zhou Yongshu Zhang Zhiqiang Liu Guojie Sui Guoyan Li Caixia Wang Shoukai Cui Yi Zhang Jingru Wang Jun Zhu |
| author_sort | Fei Zhou |
| collection | DOAJ |
| description | The geochemical characteristics, origin, and source of natural gas in the Dongping–Niudong areas are researched based on the information of components and the stable carbon isotopes of natural gas. The main component of hydrocarbon gas is methane, and C2+ possesses a relatively low content that ranges from 0.5% to 6.5%. The dryness coefficient of the Dongping area is more than 0.97, which categorizes as dry gas. The dryness coefficient of the Niudong area ranges from 90.3% to 98.1%, whilst having the characteristics of dry gas coexisting with wet gas. The δ13C1 dryness coefficient varies from −17.58‰ to −36.4‰, and δ13C2 is greater than −29‰. The gas of the Dongping 3 block has the characteristics of an abiogenic gas such as the reversed carbon isotope series. The combination of the relationship between the component of CO2 and δCCO213 and the background of development of hydrocarbon-generating sag, suggests that it is coal-derived gas. The RO and fluid inclusion studies show that the gas in Niudong area is mainly derived from Early Jurassic coal-measure source rocks of Kunteyi Sag, and there are two periods of hydrocarbon fillings. The first filling is mainly oil, and the second is mainly high mature gas; gas in Dongping area is mainly derived from Early Jurassic coal-measure source rocks of Pingdong–Yiliping Sag, and there are four periods of high-over mature gas fillings. The phenomenon of reversed carbon isotope series in Dongping area resulted from the multiple gas charging. |
| first_indexed | 2024-03-12T07:48:04Z |
| format | Article |
| id | doaj.art-a686b660103d4b8090a66e84d09f5be8 |
| institution | Directory Open Access Journal |
| issn | 2468-256X |
| language | English |
| last_indexed | 2024-03-12T07:48:04Z |
| publishDate | 2016-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Natural Gas Geoscience |
| spelling | doaj.art-a686b660103d4b8090a66e84d09f5be82023-09-02T20:49:45ZengKeAi Communications Co., Ltd.Journal of Natural Gas Geoscience2468-256X2016-12-011648949910.1016/j.jnggs.2016.11.008Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, ChinaFei Zhou0Yongshu Zhang1Zhiqiang Liu2Guojie Sui3Guoyan Li4Caixia Wang5Shoukai Cui6Yi Zhang7Jingru Wang8Jun Zhu9Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaResearch Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaResearch Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaChengxin Services Company, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaResearch Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaFaculty of Earth Resources, China University of Geosciences, Wuhan 430074, ChinaNo. 2 Producing Plant, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaResearch Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaResearch Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaResearch Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, ChinaThe geochemical characteristics, origin, and source of natural gas in the Dongping–Niudong areas are researched based on the information of components and the stable carbon isotopes of natural gas. The main component of hydrocarbon gas is methane, and C2+ possesses a relatively low content that ranges from 0.5% to 6.5%. The dryness coefficient of the Dongping area is more than 0.97, which categorizes as dry gas. The dryness coefficient of the Niudong area ranges from 90.3% to 98.1%, whilst having the characteristics of dry gas coexisting with wet gas. The δ13C1 dryness coefficient varies from −17.58‰ to −36.4‰, and δ13C2 is greater than −29‰. The gas of the Dongping 3 block has the characteristics of an abiogenic gas such as the reversed carbon isotope series. The combination of the relationship between the component of CO2 and δCCO213 and the background of development of hydrocarbon-generating sag, suggests that it is coal-derived gas. The RO and fluid inclusion studies show that the gas in Niudong area is mainly derived from Early Jurassic coal-measure source rocks of Kunteyi Sag, and there are two periods of hydrocarbon fillings. The first filling is mainly oil, and the second is mainly high mature gas; gas in Dongping area is mainly derived from Early Jurassic coal-measure source rocks of Pingdong–Yiliping Sag, and there are four periods of high-over mature gas fillings. The phenomenon of reversed carbon isotope series in Dongping area resulted from the multiple gas charging.http://www.sciencedirect.com/science/article/pii/S2468256X16300785GasComponent of gasStable carbon isotopeCoal-derived gasQaidam Basin |
| spellingShingle | Fei Zhou Yongshu Zhang Zhiqiang Liu Guojie Sui Guoyan Li Caixia Wang Shoukai Cui Yi Zhang Jingru Wang Jun Zhu Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China Journal of Natural Gas Geoscience Gas Component of gas Stable carbon isotope Coal-derived gas Qaidam Basin |
| title | Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China |
| title_full | Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China |
| title_fullStr | Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China |
| title_full_unstemmed | Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China |
| title_short | Geochemical characteristics and origin of natural gas in the Dongping–Niudong areas, Qaidam Basin, China |
| title_sort | geochemical characteristics and origin of natural gas in the dongping niudong areas qaidam basin china |
| topic | Gas Component of gas Stable carbon isotope Coal-derived gas Qaidam Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2468256X16300785 |
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