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doi:10.2204/iodp.proc.344.203.2016

Data report: gas isotope and conversion ratio of headspace and void gas, IODP Expedition 344¹

Jiyoung Choi,² Ji-Hoon Kim,² Gil-Young Kim,² Se-Won Chang²

Abstract

Gas stable isotopes (δ¹³C_CH4, δD_CH4, and δ¹³C_CO2) and the conversion ratios of headspace gas and void gas have been analyzed at Integrated Ocean Drilling Program Expedition 344 Sites U1380, U1412, and U1413 to reveal the origin and migration of gas. The results of headspace gas and void gas analyses illustrate that methane (C₁) is the dominant component and ethane (C₂) is a minor component. Variations in C₁/C₂₊ ratios with depth display differing trends across sites. The δ¹³C_CH4 and δD_CH4 values are less than –57.0‰ and –181‰, respectively, indicating that hydrocarbon gas might be originated through CO₂ reduction. In addition, the organic matter to hydrocarbon gas conversion ratios of biogenic void gas at Sites U1412 and U1413 range from 22% to 30%.

¹ Choi, J., Kim, J.-H., Kim, G.-Y., and Chang, S.-W., 2016. Data report: gas isotope and conversion ratio of headspace and void gas, IODP Expedition 344. In Harris, R.N., Sakaguchi, A., Petronotis, K., and the Expedition 344 Scientists, Proceedings of the Integrated Ocean Drilling Program, 344: College Station, TX (Integrated Ocean Drilling Program).
doi:10.2204/iodp.proc.344.203.2016

² Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Republic of Korea . Correspondence author: jychoi@kigam.re.kr

Initial receipt: 9 August 2015
Acceptance: 15 March2016
Publication: 11 May 2016
MS 344-203

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