柴达木盆地未熟—低熟石油的生烃母质研究新进展  

Progress in the Organic Matter Study of Immature Oils in the Qaidam Basin

作　　者：周凤英[1] 彭德华 边立增[3] 黄第藩 王延斌[5] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]青海石油管理局研究院,西宁736202 [3]南京大学地球科学系,210093 [4]北京石油勘探开发研究院,100083 [5]中国矿业大学,北京100083

出　　处：《地质学报》2002年第1期107-113,T003,共8页Acta Geologica Sinica

基　　金：中国石油天然气总公司"九五"科技发展规划中研究项目(编号96006-17)

摘　　要：柴达木盆地古近系—新近系烃源岩具有有机质丰度低,而烃转化率却较高,主要形成于咸水、还原环境特点,明显有别于我国东部古近系—新近系的烃源岩。特别是目前在柴达木盆地已探明的石油资源中80％为未熟—低熟石油,更是与我国东部盆地古近系—新近系原油具有明显的不同。柴达木盆地目前已探明的石油资源中近80％为未熟—低熟石油。为了了解柴达木盆地这种异常富集未熟—低熟石油的根本原因,本文借鉴古生物学的研究方法,通过改进传统提取干酪根的方式,尽可能多地保留干酪根中原有的生物形态与结构,采用将干酪根与全岩光薄片的荧光显微组分相结合的研究方法,确定了柴达木盆地未熟—低熟石油主要的、真正的生烃母质是丛粒藻及颗石藻。There are low-richness organic matter and high hydrocarbon translation ratio of Tertiary hydrocarbon source rocks in Qaidarn basin. It was formed in environment of salt water and deoxidization. It's characteristic differ from eastern petroliferous basin of China. Especially, nearly 80 percent of the proved oil resources in Qaidam Basin are immature oil. In order to explain this anomalous feature, we have improved the traditional method of kerogan extraction and combined the determination of kerogan type with maceral analysis of thin-sec-tions of mudstone. Writers have identified Botryococoous and Coccolithophorida, which are enriched fatty acid. According to our research, it is concluded that Botryococoous and Coccolithophorida are the real organic matter that forms the immature oil deposits in the Qaidam Basin.

关 键 词：未熟-低熟石油 生烃母质 丛粒藻 颗石藻 柴达木盆地 烃源岩 

分 类 号：P618.13[天文地球—矿床学]