【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。规则甾烷C27>C28<C29呈"L"字型分布,说明原油母质以水生生物为主。甾烷成熟度参数C29-ααα20S/(20S+20R)和C29-αββ/(αα+ββ)均大于0.2且小于0.4,萜烷成熟指标OEP值平均值为1.2,都说明油砂原油演化程度处于低成熟阶段。研究为柴北缘地区多元化的油气勘探提供了科学依据。更多还原

【Abstract】 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.更多还原