柴北缘鱼卡地区油砂有机地球化学特征研究  

The Geochemical Characterization of Oil Sand in Yuqia Area,the Northern Margin of Qaidam Basin

作　　者：曹占元[1] 梁晓飞[1] 张晓宝[1] 李俊武[2] 虎啸[3] 

机构地区：[1]甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,兰州730000 [2]成都理工大学,成都610000 [3]兰州大学,兰州730000

出　　处：《科学技术与工程》2015年第24期132-137,共6页Science Technology and Engineering

基　　金：甘肃省重点实验室专项(1309RTSA041)资助

摘　　要：常规油气资源日益紧张,油砂作为一种非常规石油在未来能源格局中的作用越来越重要。柴北缘鱼卡地区含有丰富的油砂资源,主要出露于上侏罗系统石岭组,分布面积近0.1 km2。以鱼卡油砂为研究对象,进行系统的GC-MS分析,结果表明：研究样品中饱和烃相对含量较高平均达44%。样品的Pr/Ph值分布在1.16~1.42之间,属于弱氧化沉积环境;三环萜烷/霍烷分布于0.019~0.025之间,r-蜡烷/0.5C31丰度平均值为0.16,具有淡水沉积环境特征。油砂饱和烃GC-MS总离子流图上具明显UCM鼓包,并在C30处出现最大值,反映该区油砂油遭受过微生物降解作用。Conventional oil and gas resources is less and less,oil sands as an unconventional petroleum is more and more important role in the future. Oil asnd is widely cropped out at Yuqia area of Qaidam Basin,The Jurassic Caishiling Formation is themain oil reservoir,The distribution area is nearly 0. 1 km2. The paper systemicly analyses Geochemical characteristics of oil sand by GC-MS,The results show that： The saturated hydrocarbon content is very high,the average is 44%; The distribution of Pr / Ph value between 1. 16 ~ 1. 42 belongs to the weak oxidation sedimentary environment,0. 019 Tricyclic terpanes / Huo alkane 〈0. 025 and Gammacerane is 0. 16,all samples in this study deposited in oxidation environment with freshwater lake facies. Oil sands saturated hydrocarbon GC-MS total ion flow graph has UCM drum kit,The oil sand are suffered biodegradation; Regular steranes C27 C28 C29 was ＂ L＂- shaped distribution,The source of organic matter is mixed,The organic Sources are mainly from aquatic organisms combined with abundant terrigenous input Secondly; Sterane maturity parameters that C29-ααα20S /（ 20 S ＋ 20R） and C29-αββ /（ αα ＋ ββ） are greater than 0. 2 and less than 0. 4,It can be seen that these samples have reached low maturation stage during their therma levolution. This study provides a scientific basis for the diversification of exploration of the northern margin of the Qaidam Basin.

关 键 词：油砂 地球化学特征 生物降解 成熟度 

分 类 号：P618.13[天文地球—矿床学]