Gas hydrates are regarded as one of the most promising alternative sources of energy, which have the potential to address the energy demand of a contemporary society. Based on the field explorations in the Eastern Nankai Trough (Japan), a multilayered hydrate reservoir model has been conceptualised and its behaviours during depressurisation production are simulated. This model incorporates the effects of the initial reservoir temperature and permeability on the mechanism of hydrate dissociation, which in turn affects the gas production. It is shown that the dissociation process is largely affected by the initial temperature distribution within the reservoir layers, and the ‘warmer’ reservoirs show (consistently) higher production potential. Furthermore, the gas production could be improved significantly, by increasing the permeability of the wellbore region, which can be achieved through the fracturing process. The close match between the simulation results and the field tests is noteworthy. The proposed multilayered model would be quite useful for analysing the efficacy of the ‘production strategy’, in most real-life situations.

中文翻译：

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日本南海海槽东部水合物储层 (AT1) 产气模拟

天然气水合物被认为是最有前途的替代能源之一，具有满足当代社会能源需求的潜力。基于东南开海槽（日本）的现场勘探，多层水合物储层模型已经概念化，并模拟了减压生产过程中的行为。该模型结合了初始储层温度和渗透率对水合物分解机制的影响，进而影响天然气产量。结果表明，离解过程在很大程度上受储层内初始温度分布的影响，并且“较暖”的储层显示出（始终）较高的生产潜力。此外，天然气产量可以显着提高，通过增加井筒区域的渗透率，这可以通过压裂过程来实现。值得注意的是模拟结果与现场测试之间的密切匹配。在大多数现实生活中，所提出的多层模型对于分析“生产策略”的功效非常有用。