A5034157756- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Geological Studies and Exploration
- Groundwater and Isotope Geochemistry
- Geology and Paleoclimatology Research
- Metabolomics and Mass Spectrometry Studies
- CO2 Sequestration and Geologic Interactions
- Chemical Reactions and Isotopes
- Atmospheric Ozone and Climate
- Ocean Acidification Effects and Responses
- Diet and metabolism studies
Japan Agency for Marine-Earth Science and Technology
2025
Tokyo Institute of Technology
2020-2023
Microbial methane production represents an important source of on Earth. In oil and gas reservoirs, microbial can be formed from secondary methanogenesis, i.e., C2+ hydrocarbons biodegradation, either directly [1] or indirectly the biodegradation products [2]. Despite its global significance [2], methanogenesis is arguably challenging to detect, mainly because isotopic signature overlaps with that existing thermogenic in reservoir, thus inferred only indirect proxies such as high 13C content...
Understanding hydrocarbon cycling in the subsurface is important various disciplines including climate science, energy resources and astrobiology. Mud volcanoes provide insights into biogeochemical processes occurring subsurface. They are usually associated with natural gas reservoirs consisting mainly of methane other hydrocarbons as well CO2. Stable isotopes have been used to decipher sources sinks subsurface, although interpretation can be ambiguous due numerous involved. Here we report...
Supercritical and liquid CO2 (sc-/liq-CO2) emitted from deep-sea hydrothermal vents create a unique dry environment distinct seawater fluids, whose physicochemical characteristics could play an important role in the ocean biogeochemical cycles of present Earth even prebiotic chemical evolution early Earth. While previous studies attempted to sample analyze sc-/liq-CO2 several fields, sampling analysis without contamination have been unsuccessful. In this study, we developed method apparatus...
Abstract Distinguishing biotic compounds from abiotic ones is important in resource geology, biogeochemistry, and the search for life universe. Stable isotopes have traditionally been used to discriminate origins of organic materials, with particular focus on hydrocarbons. However, despite extensive efforts, unequivocal distinction hydrocarbons remains challenging. Recent development clumped-isotope analysis provides more robust information because it independent stable isotopic composition...
Doubly substituted isotope species ("clumped" isotopes) can provide insights into the biogeochemical history of a molecule, including its temperature formation and/or (bio)synthetic pathway. Here, we propose new fluorination method for measurement 13 C-13 C in C2 molecules using conventional ratio mass spectrometer. Target include ethane, ethene and ethanol.13 were measured as F6 Ethane are directly fluorinated to . Ethanol is after dehydration subsequent latter. The enables Δ13 C13 values...
Rationale The 13 C‐ C isotopologues of 2 molecules have recently been measured using a fluorination method. compound is first fluorinated into hexafluoroethane (C F 6 ), and its C‐isotopologues are subsequently conventional isotope ratio mass spectrometer. Here, we present an approach for standardizing the method on absolute reference scale by isotopically enriched . Methods We prepared physical mixtures C‐labeled ethanol natural ethanol. samples were developed Based difference between...
Terrestrial hydrocarbon seeps are widely distributed in oil/gas field. To constrain the sources and post-generation processes occurring these seeping gases, various geochemical approaches, such as chemical stable isotope composition (δ13C δD) of hydrocarbons have been extensively used. However, interpretation can be ambiguous due to overlap signatures when using approaches only1. Some recently developed analytical techniques, methane clumped analysis (Δ13CH3D...