下辽河西部坳陷锦128井藻类生物标志物(分子化石)的研究  

A RESEARCH ON ALGAL BIOMARKERS (MOLECULAR FOSSILS) FROM WELL 128 OF WESTERN DEPRESSION, XIALIAOHE, LIAONING

作　　者：刘志礼[1] 刘雪娴[1] 郑岳芳 

机构地区：[1]南京大学生物系,南京210008 [2]石油部辽河油田研究院,辽宁盘锦124010

出　　处：《古生物学报》1992年第1期53-62,143,共10页Acta Palaeontologica Sinica

基　　金：中国科学院兰州地质所生物气体地球化学开放研究实验室;国家自然科学基金

摘　　要：本文介绍下辽河西部坳陷下第三系锦128井5块样品生物标志物(主要是正烷烃及δ^(13)C值)的研究。其正烷烃碳数分布范围为C_(15)—C_(25),主峰碳为C_(15)、C_(16)或C_(17)。C_(21)+C_(22)/C_(28)+C_(29)比值很大,表明这些岩样有机质来源可能和海产藻类群落有关。5块样品OEP值依次分别为1.2487,0.9569,0.9394,0.9905和0.9889非常符合生油岩0.9—1.2的标准数值。正烷烃碳数范围主要在C_(10)—C_(25),苯馏分表现出低碳和中碳芳香烃优势,说明锦128井①—⑤样品属于高成熟度的油层,特别是J128-1,2,5的层位。以上这些数值正和沟鞭藻化石反映的油源丰度和成熟度相一致。本文结果证明用生物标志物判别石油母质来源、油层对比、油气丰度和成熟度乃是很有效的方法。The algal biomarkers (molecular fossils) of five core samples from Member 3 of the Lower Tertiary Shahejie Formation, in Well No. J128 of the western part of the Xialiaohe depression are studied by GC-R1A, GC-R3A, MAT 251. Results show that n-alkane covers a wide range of carbon distributions, commonly between nC_(10)—nC_(25), with very high ratios of C_(21)+C_(22)/C_(28)+C_(29). The carbon range of main peaks is in nC_(15), nC_(16), and nC_(17); it appears to originate from marine algal matter or indicates the marine biological influence in higer degrees. The benzene carbon, indicating the 5 samples from Well No. J128 appears to come from the petroliferous strata of high maturity The organic source abundance and maturity of crude oils are reflected by fossil dinoflagellates, etc., and therefore the authors consider that the biomarker method is also of significance to discrimination of the oil reservoir, abundance, and maturity of petroleum.

关 键 词：下第三系 生物标志物 沟鞭藻类 

分 类 号：Q914.82[天文地球—古生物学与地层学]