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地球学报  2009 

藏北羌塘盆地羌资2井中侏罗统布曲组碳酸盐岩岩石学及储集物性特征

DOI: 10.3975/cagsb.2009.05.04

Keywords: 羌塘盆地,石油地质钻探,中侏罗统,碳酸盐岩,孔隙特征,储集物性特征

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Abstract:

本文讨论了羌塘盆地羌资2井中侏罗统布曲组碳酸盐岩岩石学及储集物性特征。碳酸盐岩主要有亮晶鲕粒灰岩、白云岩、泥晶灰岩,以及他们之间的过渡类型;储集空间主要有孔隙与裂缝两种类型,表现为孔隙—裂缝组合。孔隙可分为粒间溶孔、粒内溶孔、晶间孔、晶间溶孔、沿缝合线等分布的溶孔;裂缝可分为构造缝、构造—溶解缝、压溶缝和溶蚀缝。亮晶鲕粒灰岩孔隙度平均值1.084%,渗透率平均值0.0319×10-3mm2;白云岩孔隙度平均值1.77%,渗透率平均值0.1591×10-3mm2;储集物性特征均为低孔低渗、高排替压力、微-细喉道、分选中等-不好的负偏态细歪度特征。泥晶灰岩和过渡类型灰岩的储集物性特征与亮晶鲕粒灰岩和白云岩相似。最后,讨论了成岩作用对碳酸盐岩储集物性的影响,并认为成岩作用对储集物性的不利影响明显大于有利影响。

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