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川中地区上三叠统须家河组砂岩储层孔隙结构特征

Keywords: 川中地区,上三叠统,岩石类型,孔隙结构,孔隙类型

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Abstract:

?碎屑岩储层的孔隙特征是油气勘探开发中最重要的研究内容之一,更是气藏精细描述、储层综合评价的重要内容,通过采用铸体薄片观察、扫描电镜观察及压汞曲线分析等多种技术手段,对川中地区上三叠统须家河组储层的孔隙类型、孔隙组合及孔隙结构等方面进行了深入的研究。研究区须家河组储层孔隙类型可分为原生残余粒间孔、次生粒间溶蚀孔、粒内溶孔、铸模孔、晶间孔和微裂缝6种主要孔隙类型;孔隙结构可分为4种类型,即:ⅰ类粗歪双峰式—大孔中粗喉型、ⅱ类中歪双峰式—中孔中细喉型、ⅲ类细歪双峰式—中小孔细喉型和ⅳ类单峰式—小孔微细喉型,这4种孔隙类型分别对应残余原生粒间孔+粒间溶孔型、粒间溶孔+粒内溶孔型、溶孔+铸模孔型和微孔型孔隙组合类型;其中ⅰ类粗歪双峰式和ⅱ类中歪双峰式位于有利的峰点结构区,有利于油气的聚集,为中高产能储层孔隙结构。

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