鄂尔多斯盆地甘泉地区烃源岩分子地球化学特征  

Molecular Geochemistry of Source Rocks in Ganquan Region of Ordos Basin

作　　者：陈立军[1] 师愉航 冷丹凤[1] 何文忠[1] 段玉良[1] 

机构地区：[1]延长油田股份有限公司勘探开发技术研究中心,陕西延安716000 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《延安大学学报（自然科学版）》2014年第1期74-77,共4页Journal of Yan'an University：Natural Science Edition

摘　　要：GC、GC-MS分析表明,甘泉地区延长组长4+5、长6和长7各烃源岩有机质饱和烃色谱为单峰型,Pr/Ph值较高,γ蜡烷指数较低,规则甾烷αααRC27-C28-C29构型均表现为"V"字型或偏"V"字型,即C27>C28<C29,表明生物来源为混源型,为低等水生生物和高等植物双重贡献,其中长7水体较深,且低等水生生物占比重大,有机质类型偏腐泥型;各烃源岩沉积环境为较低咸度水体,有机质演化程度为成熟-高成熟阶段。The results of GC and GC - MS indicated that chromatographic peak of hydrocarbon source rocks of Chang4 ＋ 5, Chang6 and 7 in Yanchang Formationg of Ganquan region was unimodal, Pr/Ph ratio is higher,T Wax alkyl was lower,steranes at^ctRC27 -C2s -C29 conformation were expressed as ＂V＂ shaped or partial ＂V＂ shaped, ie, C27 〉 C2s 〈 C29, which showed that the type of biological origin was mixed, as low aquatic organisms and higher plants double contribution. Chang7 water was deep, and low aquatic organisms proportion of biogenic material was major, organic type partial was sapropel ; depositional environment of the source rocks was the low salinity water, or- ganic matter evolution of them was into mature - high matura ~ta~

关 键 词：甘泉地区 烃源岩 生物来源 成熟-高成熟 

分 类 号：P618.11[天文地球—矿床学]