南海北部神狐海域水合物赋存层位古环境和古生产率  

Paleo-environment and paleo-productivity of the hydrate reservoirs in the Shenhu area of northern South China Sea

作　　者：谢瑞 邬黛黛[1,2,4] 孙甜甜 杨飞 杨睿 刘丽华[1] 吴能友 XIE Rui;WU Daidai;SUN Tiantian;YANG Fei;YANG Rui;LIU Lihua;WU Nengyou(Key Laboratory of Gas Hydrate,Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences. Guangzhou 510640,China;Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences,Guangzhou 510301,China;University of Chinese Academy of Sciences. Beijing 100049,China;Evaluation and Detection Technology Laboratory of Marine Mineral Resources. Qingdao National Laboratory for Marine Sciences and Technology.Qingdao 266071 , China;Key laboratory of Gas H yd rale,Ministry of Natural Resources,Qingdao Institute of Marine Geology. Qingdao 266071,China)

机构地区：[1]中国科学院天然气水合物重点实验室中国科学院广州能源研究所,广州510640 [2]中国科学院南海生态环境工程创新研究院,广州510301 [3]中国科学院大学,北京100049 [4]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266071 [5]自然资源部天然气水合物重点实验室中国地质调查局青岛海洋地质研究所,青岛266071

出　　处：《海洋地质与第四纪地质》2019年第2期134-145,共12页Marine Geology & Quaternary Geology

基　　金：中国科学院南海生态环境工程创新研究院创新发展基金"南海水合物成藏条件对比和甲烷渗漏预警研究"(ISEE2018YB03);广东省促进经济发展专项资金(海洋经济发展用途)"南海天然气水合物高效开采与控制技术研究"(GDME-2018D002);青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室开放基金"南海北部陆坡天然气水合物生成实验模拟与原位表征"(KC201703);中国科学院青年创新促进会(2014321)

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.

关 键 词：古环境 古生产率 神狐海域 天然气水合物 

分 类 号：P736.22[天文地球—海洋地质]