EXPERIMENT RESEARCH ON AEROBIC OXIDATION OF MULTICOMPONENT HYDROCARBONS DECOMPOSED FROM MARINE GAS HYDRATES

LI Jing; HE Xingliang; LIU Changling; MENG Qingguo; NING Fulong; CHEN Yufeng

doi:10.16562/j.cnki.0256-1492.2017.05.021

2017 Vol. 37, No. 5

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Article navigation > Marine Geology & Quaternary Geology > 2017 > 37(5): 204-216

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LI Jing, HE Xingliang, LIU Changling, MENG Qingguo, NING Fulong, CHEN Yufeng. EXPERIMENT RESEARCH ON AEROBIC OXIDATION OF MULTICOMPONENT HYDROCARBONS DECOMPOSED FROM MARINE GAS HYDRATES[J]. Marine Geology & Quaternary Geology, 2017, 37(5): 204-216. doi: 10.16562/j.cnki.0256-1492.2017.05.021

Citation:

LI Jing, HE Xingliang, LIU Changling, MENG Qingguo, NING Fulong, CHEN Yufeng. EXPERIMENT RESEARCH ON AEROBIC OXIDATION OF MULTICOMPONENT HYDROCARBONS DECOMPOSED FROM MARINE GAS HYDRATES[J]. Marine Geology & Quaternary Geology, 2017, 37(5): 204-216. doi: 10.16562/j.cnki.0256-1492.2017.05.021

EXPERIMENT RESEARCH ON AEROBIC OXIDATION OF MULTICOMPONENT HYDROCARBONS DECOMPOSED FROM MARINE GAS HYDRATES

1.
The Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
2.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
3.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
4.
Chinese Academy of Geological Sciences, Beijing 100037, China
5.
Institute of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China

More Information

Corresponding author: LIU Changling, qdliuchangling@163.com

Received Date: 09 August 2017

Revised Date: 23 September 2017

Publish Date: 28 October 2017

Abstract

Abstract

Natural gas hydrate, as an enormous carbon reservoir, is mainly embedded in subsurface marine sediments. A large amount of hydrocarbons may release from the marine regions where gas hydrate deposits occur. Anaerobic or aerobic oxidation of dissociated hydrocarbon gas in its upward migration may cause hydrocarbon consumption thus decrease the carbon emission to atmosphere. Here, we performed experimental measurements on the aerobic oxidation process using marine sediments containing aerobic hydrocarbon-oxidizing bacteria to simulate the process of aerobic biodegradation for hydrocarbons (C₁+C₂+C₃) that decomposed from gas hydrate. The results show that the composition of methane, ethane and propane decreases together with carbon and hydrogen isotope fractionation during the aerobic consumption. An apparent preference for C₁ over C₂ and C₃ is observed during oxidation. The rates of oxidation are also in an order of C₁>C₂>C₃. At the same time, the carbon and hydrogen isotope of hydrocarbons show a various enrichment tendency. The enrichment amount of carbon isotope of C₁, C₂ and C₃ are 71.05‰, 12.03‰ and 4.61‰, and the average of ε_C are -11.219‰, -2.951‰ and -1.539‰, respectively. The accumulation amount of hydrogen isotope are 368.64‰, 156.00‰ and 111.97‰ for C₁, C₂ and C₃, as well as the average of ε_H are -56.092‰, -99.696‰ and -73.303‰ for C₁, C₂ and C₃ , respectively. The enrichment degree of carbon and hydrogen isotope fractionation are in an order of C₁>C₂>C₃ and C₂>C₃>C₁, respectively. Therefore, the aerobic biodegradation of hydrocarbons decomposed from gas hydrate may interfere with the origin discrimination of gas hydrate since the aerobic oxidation makes the composition and carbon and hydrogen isotope fractionation of hydrocarbon changed. Therefore, the influential factor should be considered appropriately to genesis study on gas hydrate when using decomposed hydrocarbons in headspace analysis.
- gas hydrate /
- dissociated gas /
- aerobic oxidation /
- biodegradation /
- carbon and hydrogen isotope fractionation

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