Abstract Gas hydrate reservoirs are considered as near-future energy resources in the world. As well as the many places in the world, there is also gas hydrate potential in the Mediterranean Sea. In this study, by using the literature data, it was aimed to understand whether the Mediterranean Sea includes necessary parameters for producible gas hydrate reservoirs. It was shown that the Mediterranean Sea contains all of these parameters (source gas, appropriate pressure and temperature, coarse sand potential, etc.). The only bottom-simulating reflections (BSRs) were detected in the Nile Delta of the Mediterranean Sea. In the conditions of these BSRs, the gas production potentials from Class 1 hydrate and Class 3 hydrate were analyzed by applying depressurization method with and without wellbore heating at 50 °C with HydrateResSim numerical simulator. It was observed that both gas hydrate layer in Class 1 and gas hydrate in Class 3 hydrate dissociated fully. However, the contribution of free gas layer in Class 1 hydrate on cumulative gas production was enormous so it was stated much more exploration studies are necessary in the Mediterranean Sea to detect Class 1 hydrates and BSRs. During the simulations, ice formations along the wellbores were not detected for both Class 1 hydrate and Class 3 hydrate. Hydrate reformation at 3.5 MPa and below 3.5 MPa in Class 3 hydrate was observed along the wellbore but the wellbore heating at 50 °C was enough to avoid gas hydrate reformation along the wellbore. The warm temperature of the sediments of the Mediterranean Sea was advantageous for effective depressurization. However, it was proved that methane-carbon dioxide replacement method is not applicable for the potential Mediterranean Sea gas hydrates due to the warm seafloor temperature (∼14 °C) of the Mediterranean Sea.

中文翻译：

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地中海尼罗河三角洲一级水合物和三级水合物产气数值模拟

摘要 天然气水合物储层被世界视为近未来能源。除了世界上许多地方，地中海也有天然气水合物的潜力。在本研究中，通过使用文献数据，旨在了解地中海是否包括可生产天然气水合物储层的必要参数。结果表明，地中海包含所有这些参数（源气、适当的压力和温度、粗砂潜力等）。在地中海的尼罗河三角洲检测到唯一的底部模拟反射 (BSR)。在这些 BSR 的条件下，1类水合物和3类水合物产气潜力采用HydrateResSim数值模拟器在50°C和不加井筒加热的情况下应用减压方法进行分析。观察到，1 类天然气水合物层和 3 类天然气水合物层均完全解离。然而，1 类水合物中游离气层对累积产气量的贡献是巨大的，因此认为需要在地中海进行更多的勘探研究来检测 1 类水合物和 BSR。在模拟过程中，对于 1 类水合物和 3 类水合物，沿井眼均未检测到冰层。3.5 MPa 及以下 3 的水合物重整。沿井眼观察到 3 类水合物中 5 MPa，但井眼加热 50 °C 足以避免沿井眼发生天然气水合物重整。地中海沉积物的温暖温度有利于有效减压。然而，由于地中海温暖的海底温度（~14°C），甲烷-二氧化碳置换法不适用于潜在的地中海天然气水合物。