金湖凹陷阜宁组低熟烃源岩饱和烃组成及其生源探讨  

Preliminary Study on Saturate Components Characteristics and Its' Origin of Fuling Formation Immature Source Rock in Jinghu Sag

作　　者：胡国艺[1] 冉启贵 王铁冠[2] 钟宁宁[2] 

机构地区：[1]石油勘探开发研究院廊坊分院,廊坊065007 [2]石油大学,北京100001

出　　处：《沉积学报》1997年第A12期138-141,共4页Acta Sedimentologica Sinica

基　　金：生物气体同位素国家重点开放实验室基金课题资助

摘　　要：本文应用气相色谱(GC)、色谱—质谱(GC-MS)和线性同位素质谱(GC-C-MS)分析技术对苏北盆地金湖凹陷下第三系阜宁组阜二段低熟烃源岩饱和烃组分及单体烃稳定碳同位素组成进行了深入地研究,发现甾烷类(特别是ααα(20R)-C_(29)甾烷)在饱和烃中含量很高,正构烷烃呈三峰型分布,以nC_(22)或nC_(20)为主峰。最后根据烃源岩有机显微组分和单体烃碳同位素组成特征认为正构烷烃中低碳数(<nC_(19))和中等碳数(nC_(19)—nC_(23))正构烷烃可能主要来源于菌藻类,高碳数(>nC_(23)正构烷烃主要来源于高等植物的蜡质;甾烷类(包括高丰度C_(29)甾烷)大部分可能主要由藻类贡献。The Saturate components characteristics and its' stable carbon isotope composition of individual n-alkanes of Fuling Formation immature source rock from Jinghu sag in SuBei Basin have been studied in detail by means of GC,GC -MS and GC - C -MS.As a result,the content of steranes(especiallyααα(20R) - C_(29) sterane) of saturate is very abundant.There are three major peaks in the distribution of normal alkanes.The highest peak is C_(22) or C_(20) normal alkane.According to the study of the maceral composition and the variation in stable carbon isotope of individual hydrocarbons,it is proposed that middle molecular weight(nC_(19)-nC_(23)) normal alkanes are derived from bacteria and algae and steranes(including abundent C_(29) sterane) mainly come from algae.

关 键 词：烃源岩 饱和烃 甾烷类 有机地球化学 油气藏 

分 类 号：P618.130.4[天文地球—矿床学]