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地球化学异常已成为天然气水合物研究的重要手段之一,是地球物理方法研究的补充。最近的研究发现地球化学是识别海底天然气水合物赋存的一种很有效方法。由大洋钻探ODP钻孔取上来的柱状岩心和孔隙水的地球化学异常,已建立了一套较为完整、可靠的识别水合物方法,同时还通过海底浅层(<20m)沉积物和孔隙水以及底层海水的地球化学分析来识别海底可能存在的天然气水合物,研究海底＼浅层沉积物和孔隙流水中的氧、锂、硫、盐碱度、甲烷浓度异常、氯离子浓度等地球化学异常标志,帮助寻找水合物及碳氢流体活动异常,圈定水合物可能存在的异常区。
Geochemical anomalies have become one of the important means of gas hydrate research and are complementary to geophysical methods. Recent studies have found that geochemistry is a very effective method of identifying the presence of submarine gas hydrates. A more complete and reliable method of hydrate recognition has been established for the geochemical anomalies of columnar cores and pore water taken from ocean drilling ODP boreholes, as well as sediment and pore water in the shallow seafloor (<20 m) Geochemical analysis of the underlying seawater to identify possible gas hydrates at the seafloor to study signs of geochemical anomalies such as oxygen, lithium, sulfur, salinity, methane concentration anomalies, chloride ion concentrations in submarine shallow sediments and pore water , To help find hydrate and hydrocarbon fluid abnormalities, delineation of hydrate may exist abnormal area.