Hydrostatic Properties of Hydratebearing Sediments in Seafloor Multiphase Flow Zone

Abstract

Abstract:

The process of liquid flow,methane transport and hydrate formation in seafloor leakage sediments was a widespread phenomenon. The formed hydrate precipitated in porous pores and cemented with insitu grain matrix, thereby changed the skeleton structures and hydrostatic properties. In this paper a multiphase flow model of hydrate reservoir described the hydrate-water-gas-salt interaction in sediment pores in leakage environment had been established. The evolution of capillary pressure, porosity, relative and intrinsic permeability of sedimentary strata during hydrate forming had been estimated. According to this model the distribution of gas column in Shenhu area of north South China Sea had also been predicted. The results showed that with the continuously hydrate forming and growing in the sediment pores, the gas column would gradually become longer, and at last near the seabed the critical gas column length could achieve its most height to be about 0.9 m.

Key words: multiphase flow, hydrate-bearing sediment, hydrostatic property, gas column

CLC Number:

TE122.2

GUAN Jin-An, LIANG De-Qing, WU Neng-You, WAN Li-Hua, DU Jian-Wei. Hydrostatic Properties of Hydratebearing Sediments in Seafloor Multiphase Flow Zone[J]. Geoscience, 2010, 24(5): 965-971.

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