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海域天然气水合物的聚集和分布呈现出明显的不均匀性。本文运用“天然气水合物油气系统”的理论和斱法,从墨西哥湾、布莱克海台、水合物脊、南海海槽等国际典型水合物赋存区的稳定条件、气体组分和来源、流体运移、沉积条件四个斱面解剖各区水合物的成藏控制因素。通过分析和对比认识到水合物赋存区的范围相对较小,海底温度和压力可视为均一条件,热成因气和生物成因气均可作为水合物的气体来源,同一个区域内的气体组分相对稳定,但有利沉积体和为含气流体运移提供通道的运移条件,也即“天然气水合物运聚体系”是控制水合物分布的关键因素。南海北部陆坡神狐海域水合物储集于颗粒相对较粗、孔隙空间相对较大沉积体中,而下部的气烟囱和断层极成了神狐海域的含气流体运移通道,这种有利的运聚体系有机结合可能是天然气水合物富集的关键因素。因此,针对水合物储集体的精细沉积学解释和流体运移通道的解剖,可能是南海北部陆坡天然气水合物勘探中需要引起重视的一个斱向。
The accumulation and distribution of gas hydrate in the sea area show obvious inhomogeneity. In this paper, using the theory and method of “gas hydrate system”, from the stability conditions, gas components and sources in the typical hydrate occurrence areas such as the Gulf of Mexico, Black Sea platform, hydrate ridges and the South China Sea trough, Fluid migration, sedimentary conditions four surface dissection hydrate formation control factors. Through analysis and comparison, it is recognized that the hydrate occurrence area is relatively small, and the seafloor temperature and pressure can be considered as uniform conditions. Both the thermal genetic gas and biogenic gas can be used as the gas source of hydrate, and the gas group in the same area The relatively stable, but favorable depositional and migration pathways for the transport of gas-bearing fluids are known as “gas hydrate transport system ” is the key factor in the control of hydrate distribution. Hydrocarbons in the Shenhu area on the northern slope of the South China Sea accumulate in relatively coarse particles and relatively large pore spaces, while the lower gas chimneys and faults have become gas migration channels in the Shen Fox waters. The organic combination of migration and accumulation system may be the key factor of gas hydrate enrichment. Therefore, the fine sedimentary interpretation of the hydrate reservoirs and the dissection of the fluid transport channels may be one aspect that needs attention in the exploration of gas hydrate on the northern slope of South China Sea.