榆林地区奥陶系马五5亚段白云岩成因研究

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鄂尔多斯盆地奥陶系中组合马五;亚段白云岩是继靖边奥陶系风化壳气藏成功勘探以来的又一重要碳酸盐岩勘探领域,目前靖边西侧南北向厚层、带状展布的马五。亚段白云岩勘探效果良好。已经形成近千亿立方米的储量规模,而盆地东部榆林地区马五,亚段白云岩呈孤立岛状分布,其形成机理及分布规律制约着对该区白云岩体的钻探及综合研究。通过岩心和薄片观察,发现孤立岛状白云岩体与其之间的石灰岩沉积组构明显不同,前者的形成更多反映了有生物活动的参与。形成一些生物丘。后者更多反映了一种干旱气候条件下的机械或化学沉积。参考现今新近系生物岛礁石
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