摘要
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。
Abstract
Comprehensive study is made on saturated hydrocarbon for 80 samples col-lected from modern sediments and organisms in seas,lakes,deltas and rivers in 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 single peak with an odd-even predominance and a high-carbon major peak.This distribution pattern is similar to that of the n-alkane of from modern organism in Songliao Basin,implying that the organic matters were derived from 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 the East China Sea paralic area)in south China is quite complicated,and represented by single or bimodal peak,partly with even carbon predominance.The modern sediments with normal alkane characterized by even carbon predominance werenot deposited in a strongly reduced environment,and microorganism remoulding might play an important part in the formation of even carbon predominance.
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