本申请拟以海域典型水合物分布区-东北太平洋卡斯凯迪亚聚合边缘(Cascadia)ODP204航次、IODP311航次和南海北部水合物赋存区钻井岩心样品为研究对象；以相应井中地球物理资料和组分弹性参数反演方法精确描述的井中水合物分布状态为参照；以ODP井中样品原有和南海井中样品实测分析的顶空气气态烃数据、相应位置井中样品的酸解烃及其微量甲烷同位素、ΔC(土壤碳酸蚀变)及其同位素指标的分析数据为基础，进行井中储层水合物精细分布状态与多种烃类地球化学指标特征的综合对比研究；旨在进一步认识：①各种烃类指标与水合物的赋存状态的明确对应关系和指示意义；②各种指标地球化学特征与水合物饱和度的量化关系；③从各种地球化学指标属性出发总结出针对不同类型水合物的最佳指标系列、指示意义和应用方法。成果对于提高海洋天然气水合物地球化学勘探的理论水平和在海洋水合物地球化学勘探中有重要的指导意义和实际应用价值。

The comparisons between Geochemistry characters of multiple hydrocarbons and distributions of gas hydrate in well area were studied. The study was developed in typical marine gas hydrate occurrence area, which was Cascadia Margin in IODP Expedition 311 and ODP Leg 204. The cores and geophysical logging data were used to finely describe the distributions of gas hydrate in well area. The gaseous hydrocarbon distribution characters in IODP Expendition 311 and northern South China Sea, distribution characters of acidolysis hydrocarbon and its methane isotope from cores and distributions of altered carbonate and its isotope were used to obtain the distribution of multiple hydrocarbons in well area. The comparison aimed to research the following contents: 1. the relations between the multiple hydrocarbons distributions and gas hydrate distributions; 2. the relation between the multiple hydrocarbons distributions and gas hydrate saturation; 3. the determination of optimal geochemistry index to indicate different types of gas hydrate. The research was valuable and important for the theory and application of geochemical prospecting of marine gas hydrate.