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地质论评  2004 

塔里木盆地塔中45井区碳酸盐岩储层的深部流体改造作用

Keywords: 碳酸盐岩储层深部流体萤石凝析气藏

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Abstract:

塔里木盆地塔中地区发育巨厚的下古生界海相碳酸盐岩,是该地区油气勘探的重要目标层系。塔中45井在上奥陶统灰岩储层内获得高产油气流。研究发现其含油气层段因萤石脉的改造而发育成为优质储层,这在已发现的塔中地区下古生界碳酸盐岩储层中为一独特储集体类型。综合多方面地质依据对萤石成因的分析结果表明,该储集层段是与该地区二叠纪岩浆作用有关的深部流体活动对碳酸盐岩储层改造的结果。深部流体通过溶蚀作用、交代作用和充填作用等对碳酸盐岩储层进行改造,形成深部流体改造型碳酸盐岩储集体。这一新的储集体类型的确立,对塔中地区下古生界碳酸盐岩层系油气勘探有着重要的现实意义。

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