南海北部神狐海域水合物赋存层位古环境和古生产率
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摘要
天然气水合物作为一种新型的清洁能源,其形成需要稳定的有机质供应。南海北部神狐海域为天然气水合物成藏的有利区域,2017年中国地质调查局在神狐海域水合物试采获得突破性成功。为了进一步了解古环境和古生产率对形成水合物有机质供应的影响,对南海北部神狐海域水合物钻探区SH3站位180～215mbsf(meters below the sea floor)层位,尤其是水合物主要赋存层位190～200mbsf的古环境、古生产率以及陆源碎屑物质的地球化学指标进行分析研究。研究表明水合物主要赋存层位陆源碎屑物质(TDM)输入增加,较高的陆源碎屑物质输入和次氧化的沉积环境共同造就了比较好的有机质的外部保存条件;同时较强的水动力条件,有利于藻类生物的繁殖,因此,生物成因有机质比较丰富,再加上神狐海域有比较良好的热解气的形成条件,这3个层面共同保证了神狐海域具有比较充足的有机质供应。
The accumulation of natural gas hydrate requires a stable supply of organic gas.The Shenhu area of the northern part of the South China Sea has been proved a favorable area for natural gas hydrates generation.In the year of 2017,the trial case of hydrate production made a breakthrough there.To further understand the influence of the paleo-environment and paleo-productivity onto organic preservation,this paper is specially devoted to the interval of 180-215 meters below the sea floor at the station of SH3,especially the horizon of 190-200 mbsf of the main hydrate storage in the Shenhu area.Studies on the Paleo-environment,redox environment and terrigenous detrital material input suggests that the input of terrigenous detrital material(TDM)increase in the hydrate-bearing horizons and the suboxic depositional environments.The two factors jointly created a favorable external condition for storage and preservation of organic matters.At the same time,the stronger hydrodynamic conditions are conducive to the production of algae,and the biogenic organic gas is relatively abundant.Together with the better conditions for the formation of thermogenic gas,there are enough gas sources for the formation of gashydrate deposits in the Shenhu area.
The accumulation of natural gas hydrate requires a stable supply of organic gas.The Shenhu area of the northern part of the South China Sea has been proved a favorable area for natural gas hydrates generation.In the year of 2017,the trial case of hydrate production made a breakthrough there.To further understand the influence of the paleo-environment and paleo-productivity onto organic preservation,this paper is specially devoted to the interval of 180-215 meters below the sea floor at the station of SH3,especially the horizon of 190-200 mbsf of the main hydrate storage in the Shenhu area.Studies on the Paleo-environment,redox environment and terrigenous detrital material input suggests that the input of terrigenous detrital material(TDM)increase in the hydrate-bearing horizons and the suboxic depositional environments.The two factors jointly created a favorable external condition for storage and preservation of organic matters.At the same time,the stronger hydrodynamic conditions are conducive to the production of algae,and the biogenic organic gas is relatively abundant.Together with the better conditions for the formation of thermogenic gas,there are enough gas sources for the formation of gashydrate deposits in the Shenhu area.
引文
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