Gas hydrates, dominated by methane, are commonly found in hydrocarbon seep environments, and are recovered in piston and gravity cores from marine sediments. With the presence of hydrocarbons and other geological and geophysical parameters, gas hydrates may often lead to hydrocarbon seepage identification. The importance of directly analyzing the gas hydrate in the field will enable archiving the original gas composition present within the system while minimizing any potential for loss during transport and handling. By measuring the content of C₁–C₅ in the gas hydrate embedded in surface sediments, it is possible to obtain an indication of the thermogenic character. Several gas hydrates from different basins were analyzed and compared with gas in the associated sediment to assess variability. The results show that, when present, gas hydrates can affect the sediment gas composition due to fractionation. Identifying and analyzing gas hydrate in the field is advantageous to better understand the gas source.

以甲烷为主的天然气水合物通常存在于碳氢化合物渗漏环境中，并从海洋沉积物的活塞和重力岩心中回收。由于存在碳氢化合物和其他地质和地球物理参数，天然气水合物通常可能导致碳氢化合物渗流识别。在现场直接分析天然气水合物的重要性将能够存档系统中存在的原始气体成分，同时最大限度地减少运输和处理过程中的任何潜在损失。通过测量 C ₁ –C ₅的含量在埋藏在表层沉积物中的天然气水合物中，可以获得热成因特征的指示。对来自不同盆地的几种天然气水合物进行了分析，并与相关沉积物中的天然气进行了比较，以评估变异性。结果表明，当存在天然气水合物时，会因分馏而影响沉积物气体组成。现场识别和分析天然气水合物有利于更好地了解气源。