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盆地后期改造中油气运散的效应--鄂尔多斯盆地东北部中生界漂白砂岩的形成

马艳萍  刘池洋  王建强  赵俊峰  房建军  桂小军  喻林 

摘 要:国内外不同时代砂岩漂白现象的研究表明,漂白砂岩形成均与有机流体的参与有一定联系.因而,可将其作为烃类曾经运移、聚散的线索,预测在其附近可能有(古)油、气藏存在或遭改造破坏.鄂尔多斯盆地在后期改造过程中油气赋存状态发生了重新调整.通过对鄂尔多斯盆地东北部中生界漂白砂岩的主量元素、稀土元素分析和岩石学特征研究,初步确定该区漂白砂岩形成于酸性还原环境.其岩石学特征主要表现为较高的高岭石含量及黄铁矿含量,同时氧化铁边部颜色较中心浅;主量分析结果证实漂白砂岩的Al2O3含量较高,Fe3+/Fe2+较低;稀土元素分析结果显示,无论是岩心样品还是露头样品,都存在Eu负异常,均指示了还原环境的特征.综合研究表明,鄂尔多斯盆地东北部中生界砂岩漂白现象指示了天然气的逸散作用.
关键词:漂白砂岩;天然气逸散;中生界;鄂尔多斯盆地
分类号:TE112.1 文献标识码:A

文章编号:0253-9985(2006)02-0233-06

Effects of hydrocarbon migration and dissipation in later reformation of a basin: formation of Mesozoic bleached sandstone in northeastern Ordos basin

Ma Yanping  Liu Chiyang  Wang Jianqiang  Zhao Junfeng  Fang Jianjun  Gui Xiaojun  Yu Lin 

 

基金项目:国家重点基础研究发展规划(973)项目(2003CB214607);长江学者和创新团队发展计划资助项目(IRT0559)
作者简介:马艳萍(1976-),女,博士生,盆地动力学
作者单位:马艳萍(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 
     刘池洋(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 
     王建强(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 
     赵俊峰(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 
     房建军(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 
     桂小军(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 
     喻林(西北大学,大陆动力学国家重点实验室,含油气盆地研究所,陕西,西安,710069) 

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