EVALUATION OF NATURAL GAS HYDRATE RESOURCES IN SHALLOW MARINE SEDIMENTS

The shallow gas hydrate is characterized by shallow burial depth, large thickness and high purity, compared with that in deep sediments. At present, the diffusion gas hydrate in the medium-deep marine sediments is the main target of resource evaluation for the obvious BSR reflection characteristics, while the systematic evaluation of shallow gas hydrate is rarely reported. Based on the formation mechanism of shallow surface hydrate, this paper is devoted to the feasible assessment methods for hydrate resources in shallow sediments, the definition of evaluation scope based on the spatial distribution patterns of gas hydrate, and the selection of evaluation parameters with reference to the comprehensive indication characteristics of hydrate. Finally, preliminary suggestions are made on the selection basis of the calibrated unit of shallow gas hydrate resources and educe the key problems in the resource evaluation methods for shallow gas hydrates.