Hydrate formation and distribution within unconsolidated sediment: Insights from laboratory electrical resistivity tomography

Li, Yanlong; Wu, N.; Liu, Changling; Chen, Qiang; Ning, Fulong; Wang, Shuoshi; Hu, Gaowei; Gao, Deli

doi:10.1007/s13131-021-1972-2

Acta Oceanol. Sin.

2022

DOI: 10.1007/s13131-021-1972-2

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Hydrate formation and distribution within unconsolidated sediment: Insights from laboratory electrical resistivity tomography

Yanlong Li

N. Wu

Changling Liu

et al.

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Cited by 4 publications

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“…Compared with the geoengineering-based techniques, geophysical-based methods could obtain the reservoir information in a non-invasive, wide-coverage, and field-applicable way 41,42 . There were a few attempts to characterize the deformation behaviors of the marine GHBS via the onboard geophysical-based methods.…”

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confidence: 99%

Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment

Li,

Hu,

et al. 2023

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Marine natural gas hydrate (NGH) is a promising substitutive low-carbon energy resource, whereas NGH-production induced geoengineering concerns remain challenging. Advanced forecast of possible geoengineering risks is the fundamental for eco-friendly NGH exploitation. Reservoir creep deformation is an early symptom of the geoengineering risks. However, whether the creep deformation behaviors of the NGH-bearing strata is predictable remains controversial. In this study, a series of multi-step loading creep test are conducted for sandy gas hydrate bearing sediment (GHBS) samples, during which the ultrasonic responses are recorded simultaneously. The acoustic velocity, compression-to-shear velocity ratio, Poission’s ratio, main frequency, and main frequency amplitude are used to characterize creep failures of the GHBS for the first time. Combining analyses of the creep behaviors and acoustic responses yield the following conclusions. Firstly, the long-term strength derived from creeping test is 0.45–0.60 times of the shear strength derived from triaxial shearing. Ignoring the creep effect might underestimate the scale and intensity of possible geoengineering risks during long-term NGH exploitation. Secondly, the acoustic velocity increases gently and then decreases continuously during creeping. Once the accelerated creep appears, the acoustic velocity plummets significantly, together with a sudden decrease in the compression-to-shear velocity ratio, and fluctuations in the main frequency and its amplitude. Furthermore, the main frequency and its amplitude shall fluctuate abruptly prior to the emergence of the accelerated creep. Therefore, we anticipate that the combination of abnormal fluctuations of main frequency and its amplitude can be used as early-warning indicators for possible creep failure of the GHBS. The results might have great significance for in-situ detection and prediction of possible reservoir failure during long-term NGH exploitation.

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Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment

Li,

Hu,

et al. 2023

Sci Rep

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Influences of stress state on compressional wave velocity of sandy hydrate-bearing sediment: Experiments and modeling

Hu,

Li,

et al. 2024

Geoenergy Science and Engineering

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Test research progress on mechanical and physical properties of hydrate-bearing sediments

Liu,

Kong,

Zhao

et al. 2024

International Journal of Hydrogen Energy

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Hydrate formation and distribution within unconsolidated sediment: Insights from laboratory electrical resistivity tomography

Cited by 4 publications

References 57 publications

Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment

Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment

Influences of stress state on compressional wave velocity of sandy hydrate-bearing sediment: Experiments and modeling

Test research progress on mechanical and physical properties of hydrate-bearing sediments

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