南海深水海域近代沉积物中饱和烃的地球化学特征及其来源  

Geochemical Characteristics and Source of Hydrocarbon in Recent Sediments from Deep Sea Area of the South China Sea

作　　者：林卫东[1] 周永章[1] 沈平[2] 郝银全[3] 付善明[1] 

机构地区：[1]中山大学地球环境与地球资源研究中心,广东广州510725 [2]中国科学院兰州地质研究所,甘肃兰州730000 [3]中国石油勘探开发研究院,北京100083

出　　处：《中山大学学报（自然科学版）》2005年第6期123-126,136,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：全国高等学校博士学科专项科研基金资助项目(20040558050)

摘　　要：对南海深水海域(水深>130 m)的6个表层沉积物样中的饱和烃进行了测试,正构烷烃nC21-/nC21+一般小于0.6,意味着陆源高等植物生物蜡来源的正构烷烃占优势,CPI值比正常海洋沉积物明显偏低。较高含量的不溶复杂混合物(UCM)、iC16、iC18、植烷、姥鲛烷被检测到,地质构型藿烷、甾烷在甾萜类化合物中为优势组分,萜甾烷参数显示了较为成熟的信息。饱和烃的多种地球化学参数不同程度的显示了石油源有机质混入的迹象,混入的石油源烃可能主要来自人类活动和海底天然油苗。Saturated hydrocarbon of six recent sediment samples from deep sea water area of middle South China Sea was analyzed to elucidate sources of organic matter in recent marine sediments. The low （nC14 - nC20/high （nC21 - nC33） molecular weight n - alkane is generally smaller than 0.6, suggesting the major source of hydrocarbon may be continental plant wax. Acyclic isoprenoid alkane iC16, iC18, phytane, pristane and the relative high concentration of UCM （unresolved complex mixture） were detected. Geological hopane and sterane which show more maturity information are predominant compounds among triterpenoids . All those show the interfusion of petroleum hydrocarbon in recent sediments, which probably comes from human being activities and natural seepage.

关 键 词：南海 近代沉积物 饱和烃 石油源烃 来源 

分 类 号：P931.7[天文地球—自然地理学] P618.130.2