Based on the definitions of unconventional gas reservoirs such as the tight gas, the shale gas and the coal bed methane, and the characteristics of the natural gas hydrate reservoir, the natural gas hydrate reservoir is defined as the natural gas hydrate accumulation with a certain amount of methane & other gases, migrated to appropriate strata with appropriate temperature and pressure, then stored in the formation/loose sediments in solid form, and the free gas accumulation directly associated with the natural gas hydrate accumulation. During the exploration and the evaluation of the natural gas hydrate resource, it is important to ascertain the free gas condition in the lower part of the natural gas hydrate accumulation. Characterized by the underlying free gas accumulation, the "solid-gas two-story-architecture style" natural gas hydrate reservoir is the current favorable exploitation target and the natural gas hydrate reservoir in Shenhu area is considered to be such kind of reservoir. When carrying out the resource evaluation and the test in the area, the natural gas hydrate accumulation and the free gas accumulation should be taken as a whole, which is expected to further improve the single well production and the economic benefits, promoting the exploration and the development of the natural gas hydrate.

natural gas hydrates reservoir  /  Shenhu area  /  exploration and evaluation  /  free gas  /  solid-gas two-story-architecture style