天然气水合物是一种新型清洁和后续能源，对缓解人类面临的能源枯竭危机具有举足轻重的作用。在有关天然气水合物的研究中，天然气水合物的形成机理、赋存特征、分解机制和开采方法是研究的基础和核心内容。因此，本项目针对天然气水合物研究的基础和核心内容，以吉林大学地下水资源与环境教育部重点实验室物理模拟为基础，研究建立描述天然气水合物形成、分解过程的数学模型，运用TOUGH+HYDRATE软件进行求解。通过实验室物理模拟结果与数值模拟结果对比，修改相态描述的状态方程(EOS)，完善TOUGH+HYDRATE源代码，构建一套完善的天然气水合物形成和分解过程多相流数值模拟系统，为设计试开采方案提供准确可靠的可行性分析。本项目的研究内容是我国国民经济和社会发展中迫切需要解决的关键科技问题，具有很好的应用前景。

Natural gas hydrates is a novel clean and subsequent energy, which plays an important role in easing the crisis of exhausted resources. Among the studies on the natural gas hydrates, the basis and core involve the forming mechanism, occurrence characteristic, decomposition mechanism and mining method of natural gas hydrates. On the basis of the physical simulation in Key Laboratory of Groundwater Resources and Environment and considering the above mentioned topic, a numerical model to describe the formation and decomposition process of natural gas hydrates will be established by using TOUGH+HYDRATE software to solve the model. By comparing the physical simulation results in laboratory and numerical simulation results, the state equation for state description are modified, and the source code of TOUGH+HYDRATE are further improved. Then a numerical simulation system of multiphase flow on the formation and decomposition process of natural gas hydrates will be developed, which provides accurate and reliable feasibility analysis for the design of tentative mining scheme. The present study covers an urgently technological problem on the development of national economy and society, the research results will be of great benefit to the future energy development and application.