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鄂尔多斯盆地东南部张家滩页岩元素地球化学、古沉积环境演化特征及油气地质意义

Keywords: 元素地球化学,沉积环境,张家滩页岩,鄂尔多斯盆地

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Abstract:

?页岩厚度、总有机碳含量、脆性矿物含量、物性等是页岩储层评价的关键参数,明显受其沉积环境控制。因此,分析页岩形成过程中的沉积环境对页岩储层评价和甜点预测具有重要意义。系统测试了鄂尔多斯盆地中南部y1井钻遇的张家滩页岩525组样品的40余种元素丰度,分析了其元素地球化学特征和页岩沉积环境的古气候、古水深、古盐度、古生产力、氧化还原特征。结果表明,自下而上张家滩页岩元素的丰度和比值呈周期性变化,指示其形成于温暖湿润、淡水—微咸水、缺氧等沉积环境,其中④单元发育在最潮湿的沉积环境,当时的水体最深、还原性最高,具有较高的古生产力。

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