摘要
应用GC、GC/MS技术,系统分析研究了鄂尔多斯盆地演武高地镇28井区长3油层组原油的生物标志化合物组成及地球化学特征,结果表明:生烃母质提供者既有菌藻类,又有陆源高等植物,且后者贡献较大;原油形成于弱氧化—弱还原的淡水环境;原油为成熟原油(C29甾烷和C31藿烷异构体参数接近或达到平衡,重排甾烷/规则甾烷值和Ts/(Tm+Ts)值较高,正构烷烃CPI值接近于1,甲基菲指数较高)。
Twelve crude oils from the Zhen 28 Well field in the Ordos Basin were systematically analyzed and the geochemical characteristics of biomarkers in these samples were studied. The distribution and composition of the biomarkers indicate： the distribution of normal alkane and tricyclic terpanes shows that homoneneae and higher plants contribute to organic material, and the latter is the main contributor; the values of Pr/Ph, Pr/nC12 and Ph/nC18 reflect that crude oils are generated in a low oxidizing-low reducing depositional environment; the content of gammacerane in crude oils suggests that crude oils are generated in a fresh water depositional environment; the parameters of C29 steranes and C31 hopanes isomers also reach equilihrium value, the value of diasteranes/regular-steranes and Ts/（Tm＋Ts） are high, CPI is close to 1, and the methylphenanthrene index suggests respectively that crude oils are in the mature stage.
出处
《天然气地球科学》
EI
CAS
CSCD
2008年第5期718-721,共4页
Natural Gas Geoscience
关键词
演武高地
长3油层组
原油
生物标志化合物
地球化学特征
Yanwu highland
Chang 3 oil layer group
Crude oil
Biomarker
Geochemical characteristics.
