柴达木盆地北缘微量元素含量及油气地质意义  

Trace Element Contents and Their Oil-Gas Geological Significance in Northern Margin of Qaidam Basin

作　　者：曾春林[1] 姜波[1] 尹成明 汪焰华[1] 鲍园[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《新疆石油地质》2009年第5期566-568,共3页Xinjiang Petroleum Geology

基　　金：国家油气专项(XQ-2004-01)资助

摘　　要：对柴北缘微量元素测试结果表明,Sc、Ti、Cr、Ni、Zn、Cs、La、Tb、Ho、Lu等元素在半深湖相中的含量明显高于其他沉积环境中的;微量元素同常量元素具有较强的相关性,Cr、Co、Cu、Ni、Cs、La以及La系元素与Ti、Fe呈正相关,而与K、Si、Al呈负相关;鱼25井Ni/Co比值平均为4.22,δCe值平均为3.9,均显示该地区中侏罗世为还原环境。微量元素垂向上的变化反映了鱼25井中侏罗世经历了2个完整的基准面上升-下降的旋回。经测试样品与标样的微量元素对比认为,柴北缘地区的砂岩为基性-中性物源。微量元素对沉积环境分析、找寻烃源岩和油气勘探具有重要意义。The testing results of trace elements in the northern margin of Qaidam basin show that contents of Sc, Ti, Cr, Ni, Zn, Cs, La, Tb, Ho, Lu in semi-deep lake facies are obviously higher than those in the other sedimentary settings; the Cr, Co, Cu, Ni, Cs, La and La series elements have positive correlations with Ti and Fe, but negative correlations with K, Si, Al; the Ni/Co ratio （4.22） and 8Ce value （3.9） from Well Yu-25 indicate that the Middle Jurassic is reducing environment. The vertical changes of the trace elements show that the Middle Jurassic in Well Yu-25 experiences two up-down base level cycles. Based on the comparison of trace elements between test samples and standard samples, the sandstone in the northern margin of Qaidam basin is believed to be basic-neutral provenance. It is suggested that trace element is of great significance in sedimentary environment analysis, searching for source rocks and oil-gas exploration.

关 键 词：柴达木盆地 北缘 微量元素 沉积环境 油气地质 意义 

分 类 号：P618[天文地球—矿床学]