柴西地区上干柴沟组上段咸水湖相烃源岩生烃条件研究  

Study on Hydrocarbon Generation Conditions of Saline Lacustrine Source Rocks of the Upper Unit of the Upper Ganchaigou Formation in Western Qaidam Basin

作　　者：何金先[1,2,3] 段毅 张晓丽[1,2,3] 吴保祥[1,2] 徐丽[1,2,3] 

机构地区：[1]中国科学院地质与地球物理研究所兰州油气资源研究中心,甘肃兰州730000 [2]中国科学院油气资源研究重点实验室,甘肃兰州730000 [3]中国科学院研究生院,北京100049

出　　处：《矿产与地质》2011年第3期242-247,共6页Mineral Resources and Geology

基　　金：国家自然科学基金(编号:10772069;40872092)资助

摘　　要：柴西地区上干柴沟组上段(N12)烃源岩的沉积水体环境为咸水湖相。其烃源岩的有机质总体丰度不高;有机质类型主要有腐殖腐泥型和腐殖型,具体分布受烃源岩所处位置及沉积环境控制;有机质成熟度多为未成熟-低成熟;有机质的烃转化率较高,反映其大部分有机质已经进入生烃门限,少量已经进入生烃高峰期。其烃源岩具有咸化湖泊相未熟-低熟有机质生烃的特点,而其生烃机理很可能是藻类生物类脂物和细菌的早期成烃。柴西地区上干柴沟组上段(N12)烃源岩作为该区未熟-低熟石油主要源岩之一,具有非常大的勘探潜力。The sedimentary environment of source rocks of the upper unit of the Upper Ganchaigou Formation in Western Qaidam Basin was saline lacustrine facies.The overall organic matter abundances in source rocks of the Upper Ganchaigou Formation was low;the organic matter types were mainly humic-sapropelic type and humic type,and the types were controlled by the location and the sedimentary environment;the organic matter maturity was immature-low mature;the hydrocarbon conversion rate was high,and reflected that most of organic matter had entered the hydrocarbon generating threshold,and a little of organic matter had entered hydrocarbon generation peak.The source rocks of Upper Ganchaigou Formation in Western Qaidam Basin had characteristics of hydrocarbon generation in immature-low mature organic matter,and the hydrocarbon generation mechanism of immature-low mature source rocks might be that early-stage hydrocarbon generation was occurred in lipids of algae and bacterium.The source rock of the upper unit of the Upper Ganchaigou Formation in Western Qaidam Basin was one of the main source rocks of immature-low mature oil in this region and showed their great exploration potentiality.

关 键 词：有机质特征 生烃条件 咸水湖相 勘探潜力 柴达木盆地西部地区 

分 类 号：P5[天文地球—地质学]