Japan Geoscience Union Meeting 2015

Presentation information


Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS24] Gas hydrates in environmental-resource sciences

Thu. May 28, 2015 9:00 AM - 10:45 AM 102B (1F)

Convener:*Hitoshi Tomaru(Department of Earth Sciences, Chiba University), Akihiro Hachikubo(Environmental and Energy Resources Research Center, Kitami Institute of Technology), Sumito Morita(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology), Chair:Akihiro Hachikubo(Environmental and Energy Resources Research Center, Kitami Institute of Technology)

9:15 AM - 9:30 AM

[MIS24-07] The biomarker composition of petroleum-like substance isolated from methane hydrate in RC 1403 core

*Shigenori OGIHARA1 (1.Earth & Planetary Science, The University of Tokyo)

Keywords:Japan Sea, Methane hydrate, biomarker

A substance like petroleum was isolated from the thick methane hydrate layer located at the RC 1403 core depth of 27m. Similar petroleum-like substance was included in the rounded gravel bed above the methane hydrate layer.
After the isolation and separation of a biomarker, GC/MS analysis was performed. The nature of the substance like petroleum, origin, history of the heat and microorganism decomposition was argued. The hydrocarbon fraction and ketone/ester fraction were used for this study.
A hydrocarbon fraction is characterized by the existence of hump in the low carbon number area, and two kinds of bicyclic sesquiterpanes and small amount of C25 tetracyclic terpane. On the other hand, n-alkane nor acyclic isoprenoids such as pristine and phytane were not detected in the chromatogram of hydrocarbon fraction.The feature of hydrocarbon fraction resembled to the very heavy biodegraded oil.
Ketone/ester fraction was characterized by hopanic and hopenic ketone.
In a particular, the angiosperm marker such as upanoid ketone, ursranoid ketone was detected. The existence of angiosperm marker indicates that the source of substance like petroleum was affected by terrestrial higher plant.
This research is a part of METI's project entitled "FY2014 Promoting research and development on methane hydrate"