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中文摘要：
目的分析鄂尔多斯盆地侏罗系直罗组沉积相类型、平面展布及其演化特征。方法以露头和钻井资料为基础,进行相标志识别,垂向序列、测井相、古生物化石及元素地球化学特征分析,并结合地层厚度、砂岩厚度、砂岩层数及砂岩百分含量等区域制图进行研究。结果直罗组下段以辫状河、曲流河沉积为主,东北部发育三角洲沉积。上段以辫状河、曲流河、三角洲和湖泊沉积为主。结论直罗组沉积早期盆地周缘地貌高差较大,物源供给充分,气候较温暖湿润。晚期沉积时,周缘地貌高差减小,气候干旱,物源供给不足,聚煤条件完全丧失。直罗组缺乏边缘相,沉积中心残存不全,表明原始盆地边界尚远。直罗组下段辫状河道砂岩具有良好的渗透性、连通性和成层性,是砂岩型铀矿和石油的良好储层。
英文摘要：
Aim To analyse the characteristics of sedimentary facies＇type,distribution and its evolution of Jurrasic Zhiluo formation in Ordos basin.Methods Based on the outcrops and well data,kinds of analysis such as sedimentary facies marks,vertical sequence,well logging facies,ancient life fossils and element geochemistry are studied in combination with mapping of stratum thickness,sandstone thickness,layer number of sandstone and percentage of sandstone.Results It＇s considered that the main sedimentary facies of lower member of Zhiluo formation are braided river,meandering river system and few delta in the residual basin,while that of the upper member are mainly braided-meandering river,delta and lacustrine system.Conclusion During deposition of lower period,there were higher geographical differences,abundant provenance supply,warm and moist climate.During deposition of late period,there were lower geographical differences,lack of provenance supply.Favourite climate suited for coal accumulation was lost.Being scarcing of marginal facies and fragmentary depocenter demonstrates that the original boundary of basin is distant.The sandstone deposited in braided channel of lower member of Zhiluo formaion has excellent permeability,connectedness and well bedding,so it is the well reservoir of sandstone-type uranium deposits and hydrocarbon.
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