Abstract
The decomposition of natural gas hydrate will reduce the cementation effect of hydrate and produce ultra-static pore pressure, which will change the mechanical characteristics of the reservoir. Eventually, a series of geological disasters could be triggered, of which the submarine landslide is a typical example. In order to analyze the stability of hydrate-bearing submarine slopes and to explore the internal relationship between hydrate decomposition and submarine landslides, a “two-step reduction method” was described in this paper. This method was based on a strength reduction approach, which can be used to assess the effects of the initial geostress balance and hydrate decomposition on substrate strength reduction. This method was used to reveal the essence of hydrate decomposition, and then, a joint operation mode of multi-well was proposed. The internal relationship between hydrate decomposition and submarine landslides was analyzed in detail. And the development process and mechanism of submarine landslide were deeply discussed. The results showed that hydrate decomposition is a dynamic process of stress release and displacement, where the “stress inhomogeneity” distributed along the slope is transformed into “displacement inhomogeneity.” We concluded that hydrate decomposition could trigger a submarine landslide, especially along a sliding surface. The formation of submarine landslide is a gradual development process and presents the dual characteristics of time and space.
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This work was financially supported by the National Natural Science Foundation of China (project Grants 12172187 and 51778311). The support is gratefully acknowledged with thanks.
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Zhao, Y., Kong, L., Liu, L. et al. Influence of hydrate exploitation on stability of submarine slopes. Nat Hazards 113, 719–743 (2022). https://doi.org/10.1007/s11069-022-05321-y
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DOI: https://doi.org/10.1007/s11069-022-05321-y