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珠江口盆地北部钻井揭示了第三纪由陆至海的沧桑巨变。相应有机地化特征的变化是:陆源生物标志化合物减少,正构烷烃高碳数主峰向低碳数主峰转化,姥鲛烷优势逐渐被植烷优势取代,氯仿抽提物δ~(13)C渐增以及V卟啉/Ni卟啉某由小于1变至大于1等等。地化特征的规律性变化主要是沉积环境改变所引起的生源物差异输入和地化条件不同的结果,因而可以通过地化特征的综合分析判识沉积环境,并为沉积模式的建立和生油层的分布提供依据。
The drilling of the northern Pearl River Mouth Basin revealed the tremendous changes in the Tertiary from land to sea. The change of corresponding organic geochemical characteristics was that the terrigenous biomarkers decreased, the main peak of high carbon number of normal paraffins was transformed to the main peak of low carbon number, the superiority of pristane was gradually replaced by that of phytane, and the chloroform extract δ 13 C Increasing and V porphyrin / Ni porphyrin some change from less than 1 to more than 1 and so on. The regular change of geochemical characteristics is mainly the result of different input and geochemical conditions caused by changes in sedimentary environment. Therefore, the sedimentary environment can be identified through the comprehensive analysis of geochemical characteristics, Provide the basis for the distribution.