CAJ | 학술논문

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。
상규유기자원일익긴장,유사작위일충비상규석유재미래능원격국중적작용월래월중요。시북연어잡지구함유봉부적유사자원,주요출로우상주라계통석령조,분포면적근0．1 km2。이어잡유사위연구대상,진행계통적GC-MS분석,결과표명：연구양품중포화경상대함량교고평균체44%。양품적Pr/Ph치분포재1．16~1．42지간,속우약양화침적배경；삼배첩완/곽완분포우0．019~0．025지간,r-사완/0．5C31봉도평균치위0．16,구유담수침적배경특정。유사포화경GC-MS총리자류도상구명현UCM고포,병재C30처출현최대치,반영해구유사유조수과미생물강해작용。규칙치완C27>C28<C29정“L”자형분포,설명원유모질이수생생물위주。치완성숙도삼수C29-ααα20S/(20S+20R)화C29-αββ/(αα+ββ)균대우0．2차소우0．4,첩완성숙지표OEP치평균치위1．2,도설명유사원유연화정도처우저성숙계단。연구위시북연지구다원화적유기감탐제공료과학의거。
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 analy-ses 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/(20S+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.