ANALYSES ON DYNAMIC METHANE HYDRATE ACCUMULATION SIMULATION IN SHENHU AREA OF THE NORTHERN SOUTH CHINA SEA

The deposit in Shenhu area is a kind of complicated marine hydrate system. Thus the mechanism of its dynamic accumulation still needs to be further studied and clarified. A flow-transport-reaction model, coupled with the kinetic characteristic of hydrate reaction, has been established to evaluate the formation of the hydrate deposits. Two types of the marine hydrate systems, one formed by only dissolved methane and the other formed by both dissolved methane and free gas, have been respectively discussed about how they contribute to the accumulation of the hydrate-bearing sediments. The hydrate saturation at the bottom of hydrate stable zone has been deduced, and the influences of the free gas content and the hydrate kinetic characteristics have also been studied to examine the collection process of hydrate deposits in this area. The results imply that certain kinds of special geologic events have happened to transform the formation and aggregation of the hydrate deposits in this area.