Masahiko Yagi
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View article: Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO<sub>2</sub>-Rich Brine: Implications for CO<sub>2</sub> Mineralization
Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO<sub>2</sub>-Rich Brine: Implications for CO<sub>2</sub> Mineralization Open
Hydrothermally altered basaltic rocks are widely distributed and more accessible than fresh basaltic rocks, making them attractive feedstocks for permanent CO2 storage through mineralization. This study investigates the reactivi…
View article: Geological age of the Sashida Limestone in south Izu region, Japan based on microfossils
Geological age of the Sashida Limestone in south Izu region, Japan based on microfossils Open
The late Cretaceous, Paleocene, late Middle to Late Eocene, Oligocene and early Early Miocene larger(benthonic)and planktonic foraminifera were confirmed for the first time, in addition to Early-Middle Miocene larger foraminifera, from the…
View article: Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan
Strontium isotopic age and the origin of including basalt pebbles of the Sashida Limestone in south Izu region, Japan Open
In the previous paper, the geological ages of the Late Cretaceous, Paleocene, late Middle to Late Eocene, Oligocene and early Early Miocene were confirmed at the first time, based on the occurrences of both the age diagnostic larger forami…
View article: Organic geochemical studies on mudrocks from the Upper Cretaceous Himenoura Groupwith oil seepage in Himedo Town, Kami-Amakusa City, Kumamoto Prefecture, southwest Japan
Organic geochemical studies on mudrocks from the Upper Cretaceous Himenoura Groupwith oil seepage in Himedo Town, Kami-Amakusa City, Kumamoto Prefecture, southwest Japan Open
天草諸島では，以前より白亜系姫浦層群や古第三系白岳層で油徴·油臭があることが知られている．本研究では，油徴が確認された姫浦層群泥質岩の石油生成ポテンシャルの検討を目的として，姫戸町小島周辺に分布する泥質岩の有機地球化学的分析を実施した．その結果，油徴周辺の泥質岩の全有機物量（TOC）は0.65〜1.10wt.%，遊離炭化水素量（S1）は0.02〜0.13mgHC/gRock，熱分解炭化水素量（S2）は0.12〜0.36mgHC/gRock，熱分解二酸化炭素量（S3）は0.1…
View article: SYMPOSIUM Natural Gas Exploration & Development Opening remarks
SYMPOSIUM Natural Gas Exploration & Development Opening remarks Open
View article: Effects of near-surface diagenesis on pore system of a Cenozoic carbonate buildup:
Effects of near-surface diagenesis on pore system of a Cenozoic carbonate buildup: Open
Cenozoic carbonate buildup reservoirs having a vuggy pore system often show complicated reservoir quality and distribution due to near-surface diagenetic modification including subaerial exposure events. In this study, we evaluate the effe…
View article: Carbonate facies and reservoir quality of the Kujung Formation in Kangean Island, East Java, Indonesia
Carbonate facies and reservoir quality of the Kujung Formation in Kangean Island, East Java, Indonesia Open
View article: New <i>ν</i>‐type relative permeability curves for two‐phase flows through subsurface fractures
New <i>ν</i>‐type relative permeability curves for two‐phase flows through subsurface fractures Open
Appropriate relative permeability curves for two‐phase flows through subsurface fractures remain unclear. We have conducted decane‐water and nitrogen‐water two‐phase flow experiments and simulations on real variable‐aperture fractures in r…