2018 Fiscal Year Research-status Report
プロパンの重水素置換種分析に基づく天然ガス生成温度の推定
| Project/Area Number |
18K18782
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
ジルベルト アレキシー 東京工業大学, 理学院, 助教 (20726955)
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| Project Period (FY) |
2018-06-29 – 2020-03-31
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| Keywords | Natural gas / Propane / Deuterium isotope ratio |
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| Outline of Annual Research Achievements |
We have developed and optimized a system to analyze intramolecular D/H isotope composition of propane from natural gas.
The system is based on previous system developed for 13C/12C isotope ratio determination, but had to be optimized in order to allow the measurement of all pyrolytic fragments from propane, including H2.
We showed that H-atom scrambling occurs during the pyrolysis of propane, which alters the original signature obtained. But, we showed using propane samples D-enriched on specific positions that the scrambling is reproducible and can be accounted for easily.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The main reason that we spent time to develop the method is because we needed to work on conditions for good peak spearations, especially from small fragments (H2 and CH4).
Thus, this took effort and also machine time.
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| Strategy for Future Research Activity |
Future plan include:
(i) calibration of the method with samples which intramolecular D/H isotope composition have been measured by NMR. For this, a collaboration with Texas Tech is ongoing.
(ii) Simulating propane formation at different temperature by doing thermal cracking of hydrocarbons. This will assess the potential of D/H raio as a geothermometer
(iii) analyzing propane from natural gas samples of different origins (abitoic, thermogenic, biodegraded samples) in order to determine their temperature of formation.
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| Causes of Carryover |
We were planning to buy small equipments and consumables for thermogenic simulation experiments but they were a bit delayed.
Next year we will use the remaining budget to buy this equipment and consumables.
The remaining budget will also be used to travel to AGU2019.
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[Journal Article] Methane sources and sinks in continental sedimentary systems: New insights from paired clumped isotopologues 13CH3D and 12CH2D22019
Author(s)
T. Giunta, E. D Young, O. Warr, I. Kohl, J. L. Ash, A. Martini, S. O. C. Mundle, D. Rumble, I. Perez-Rodriguez, M. Wasley, D. E. LaRowe, A. Gilbert, B. Sherwood Lollar
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Journal Title
Geochim. Cosmochim. Acta
Volume: 245
Pages: 327-351
DOI
Peer Reviewed / Int'l Joint Research
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