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鄂尔多斯盆地深层寒武系烃源岩展布特征及其勘探意义

Keywords: 寒武系,勘探,鄂尔多斯盆地,深层,奥拉谷

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Abstract:

?鄂尔多斯盆地深层寒武系海相沉积是重要的勘探领域。从基础地质研究入手,通过系统研究盆地周边露头剖面及盆地内钻遇寒武系的探井资料、重点分析寒武系岩性岩相特征及分布特点、采集寒武系暗色岩石样品并进行toc、氯仿沥青“a”等分析测试。结果表明,鄂尔多斯盆地深层寒武系分布稳定,厚度约为50~800m,主要由缓坡—台地相碳酸盐岩及混积缓坡—深水相泥岩、碳酸盐岩组成|盆地南中部寒武系馒头组黑色泥岩及三山子组深灰色、灰黑色纹层状白云岩形成于还原环境,有机质含量相对较高(toc最高值为0.34%),具有一定的生烃潜力。寒武系及其暗色岩类在贺兰奥拉谷和歧山—延安奥拉谷厚度明显增大,toc值也明显增高,在环县、定边地区也有toc高值区出现,表明了奥拉谷是鄂尔多斯盆地寒武系主要烃源岩发育区,预测可与中央古陆隆起带及其斜坡区形成有效的生烃—聚集成藏组合,鄂尔多斯盆地寒武系是值得进一步研究和勘探的重要层系。

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