Prediction of the mechanical response of hydrate-bearing sands

S. Pinkert, J. L.H. Grozic

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

In recent years there has been an increasing interest in production of methane gas from hydrate-bearing sediments, located below the permafrost in arctic regions and offshore within the continental margins. In order to simulate the geomechanical response of the hydrate accumulation during gas production, comprehensive evaluation of the sediments' properties is imperative. This paper presents an analysis of the mechanical properties of methane-hydrate-bearing sediments determined through numerical simulation of drained triaxial compression tests on three different sand types. The adjustment of the numerical to the experimental results was performed for the entire stress-strain curves and therefore enables a good understanding of the material constitutive relations. New constitutive relations are suggested for the hydrate-related properties. An optimization process was used, finding separately the soil skeleton-related coefficients and the hydrate-related coefficients. The values of the obtained coefficients associated with the hydrate were found to have minor deviations from each other, for the three examined sand types. By separating the soil skeleton and the hydrate-related response, this paper suggests a prediction method for the mechanical response of hydrate-bearing sands. Key Points Mechanical behavior prediction of hydrate-bearing sands Constitutive law of hydrate-bearing sands Optimization process for the evaluation of the geomechanical properties

Original languageEnglish
Pages (from-to)4695-4707
Number of pages13
JournalJournal of Geophysical Research: Solid Earth
Volume119
Issue number6
DOIs
StatePublished - 1 Jan 2014
Externally publishedYes

Keywords

  • hydrate-bearing sand
  • mechanical properties
  • methane hydrate
  • optimization
  • prediction method

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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