Empirical evaluation of the strength and deformation characteristics of natural and synthetic gas hydrate-bearing sediments with different ranges of porosity, hydrate saturation, effective stress, and strain rate ...

• Main Authors: Yoneda, Jun, Suzuki, Kiyofumi, Oshima, Motoi, Muraoka, Michihiro, Jin, Yusuke
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: figshare 2024
• Subjects: Biophysics; Environmental Sciences not elsewhere classified; Ecology; FOS: Biological sciences; Methane hydrate
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.7026745.v1; https://springernature.figshare.com/collections/Empirical_evaluation_of_the_strength_and_deformation_characteristics_of_natural_and_synthetic_gas_hydrate-bearing_sediments_with_different_ranges_of_porosity_hydrate_saturation_effective_stress_and_strain_rate/7026745/1

Abstract Evaluating the mechanical properties of gas (primarily methane) hydrate-bearing sediments is essential for commercial production as a next-generation resource and understanding the global carbon cycle. Triaxial and uniaxial compression tests have been conducted on synthetic gas hydrate and natural core samples recovered from deep-sea beds using pressure coring techniques. The results show that four factors are vital in establishing the strength of hydrate-bearing sediments: hydrate saturation, effective confining stress, porosity, and strain rate. However, no study has evaluated these factors in a unified and quantitative manner, and even if the physical properties of the reservoir are known in detail from logging, predicting the strength has been challenging. In this study, pressure cores were drilled and recovered from the Eastern Nankai Trough in April 2018 after Japan’s second offshore production test, and triaxial or uniaxial compression tests were performed on 12 pressure core samples brought ...