Stability analysis of submarine slopes in the area of the test production of gas hydrate in the South China Sea

作者：Yao-hong Shi,Qian-yong Liang,Jiang-pin Yang,Qing-meng Yuan,Xue-min Wu,Liang Kong

摘要：In this paper, the mechanical properties of gas hydrate-bearing sediments (GHBS) were summarized and the instability mechanism of submarine hydrate-bearing slope (SHBS) was analyzed under the background of the test production of gas hydrate in the northern part of the South China Sea. The strength reduction finite element method (SRFEM) was introduced to the stability analysis of submarine slopes for the safety of the test production. Two schemes were designed to determine the physical and mechanical parameters of four target wells. Through the division of the hydrate dissociation region and the design of four working conditions, the range and degree of hydrate dissociation at different stages during the test production were simulated. Based on the software ABAQUS, 37 FEM models of SHBS were set up to analyze and assess the stability of the submarine slopes in the area of the test production. Necessary information such as safety factors, deformation, and displacement were obtained at different stages and under different working conditions. According to the calculation results, the submarine slope area is stable before the test production, and the safety factors almost remains the same during and after the test production. All these indicate that the test production has no obvious influence on the area of the test production and the submarine slopes in the area are stable during and after the test production.

发文机构：Guangzhou Marine Geological Survey Gas Hydrate Engineering Technology Center School of Science

关键词：GASHYDRATEtestPRODUCTIONStrengthreductionfiniteelementmethodSUBMARINEslopeStabilityGASHYDRATEexplorationengineeringSouthChinaSeaChina

分类号： P[天文地球]