【摘要】 <正> 自从 E.E.Bray 和 E.D.Evans(1961)发现近代沉积物中正构烷烃具有奇碳优势,而在成熟生油岩和原油中这种优势趋于消失这一特点之后,奇碳优势的消失被普遍地认为是生油岩业已成熟的重要标志之一。但七十年代以来,我们发现我国东部现代沉积物中不仅存在高碳数奇碳优势正烷烃,也存在偶碳优势正烷烃。作者对采自我国东部海洋、湖泊、三角洲和河流现代沉积物以及现代生物的近80个样品的饱和烃分析资料作了综合研究。这些地区分属两个不同的气候带。松辽盆地属温带半干燥气候带,其更多还原

【Abstract】 Comprehensive study is made on saturated hydrocarbon for 80 samples col-lected from modern sediments and organisms in seas,lakes,deltas and riversin eastern China.The n-alkane from modern sediments of semi-arid climatic zones (from Song-liao Basin to the Yellow Sea) in north China is mainly represented by a singlepeak with an odd-even predominance and a high-carbon major peak.Thisdistribution pattern is similar to that of the n-alkane of Artemisia from modernorganism in Songliao Basin,implying that the organic matters were derivedfrom continental plants.The distribution pattern of n-alkane in modern sediments of the semi-humid climatic zone (along the middle to lower reaches of the Yangtzi River and theEast China Sea paralic area) in south China is quite complicated,and representedby single or bimodal peak,partly with even carbon predominance.The modernsediments with normal alkane characterized by even carbon predominance werenot deposited in a strongly reduced environment,and microorganism remouldingmight play an important part in the formation of even carbon predominance.更多还原