【作者】 何家雄； 卢振权； 张伟； 苏丕波； 李晓唐；

【Author】 He jia-xiong;Lu zhen-quan;Zhang wei;Su pi-bo;Li xiao-tang;CAS Key Laboratory of Marginal Sea Geology,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences;Oil and Gas Survey,China Geological Survey;Guangzhou Marine Geology Survey,Ministry of Land and Resource;

【机构】 中国科学院边缘海地质重点实验室； 中国地质调查局油气资源调查中心； 国土资源部广州海洋地质调查局；

【摘要】 海洋地质调查及勘查钻探表明,南海北部陆坡深水区天然气水合物资源丰富,是我国深水海域天然气水合物资源勘探最佳战略选区。天然气水合物成矿成藏条件与油气成藏条件虽然存在差异,但亦存在共同之处,即均需要有充足烃源供给及烃源供给系统输送与有利聚集场所的时空耦合配置。本文根据南海北部陆坡深水区构造沉积演化特点及油气地质条件与多年来油气及水合物勘探成果,深入分析研究了油气及天然气水合物气源构成特点与流体运聚输导系统特征,同时根据地质地球物理及地球化学分析,综合判识剖析了气源供给运聚通道系统类型与高压低温天然气水合物稳定带的时空耦合配置关系,并结合油气地质及天然气水合物成矿成藏基本地质条件,总结和建立了南海北部陆坡深水区"生物气源自生自储扩散运聚型"、"热解气源断层裂隙输导下生上储运移渗漏型"和"热解气源底辟及气烟囱输导下生上储运移渗漏型"三种成因类型的天然气水合物成矿成藏模式,以期能为南海北部深水区天然气水合物资源预测及有利勘查目标评价优选等提供决策依据与指导。更多还原

【Abstract】 Marine geological survey and exploration drilling shows that the deep-water area of northern slope in the South China Sea has abundant natural gas hydrate resources and it is considered to be the best natural gas hydrate exploration strategic constituencies in deepwater area of our country. Although there are differences of formation conditions between natural gas hydrates reservoirs and petroleum accumulation, they also have some requirements in common, both of them need the spatiotemporal coupling configuration between sufficient hydrocarbon source supply,source supply transportation system and favorable gathering places. Based on the tectonic sedimentary evolution, petroleum geological conditions,and years of oil/gas and gas hydrate exploration results of the northern South China Sea continental slope areas, this paper deeply analyzed the gas sources composition of petroleum and gas hydrate,and the characteristics of fluid migration transporting system, at the same time, according to the analysis results of geology, geophysics and geochemistry, the space-time coupling configuration relationship between the types of gas migration channel system and the gas hydrate stability zone that is characterized by high pressure and low temperature are also dissected synthetically. What’s more, combining the basic geological conditions of oil/gas and gas hydrate reservoir, three models of natural hydrate formation and accumulation in northern slope deep-water area of South China Sea were summarized and established,they are "biogenic gas accumulate in place by way of self –generation and self-bearing", "thermal gas accumulate offsite through faults and fractures by way of lower-generation and upper storage","thermal gas accumulate offsite through mud diapir and gas chimney by way of lower-generation and upper storage". This paper hopes to provide decision-making basis and guidance for the prediction of natural gas hydrate resources and the favorable exploration target evaluation in the deep water area of the northern South China Sea.更多还原