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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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川西丰谷构造须家河组四段钙屑砂岩优质储层控制因素
Keywords: 钙屑砂岩,特低孔特低渗储层,控制因素,沉积特征,成岩作用,构造运动,须四段
Abstract:
？钙屑砂岩在整个川西坳陷须家河组四段广泛发育，且普遍致密。采用铸体薄片、扫描电镜、物性分析和水岩实验等手段，对丰谷构造须四段钙屑砂岩的基本特征进行了分析，探讨了沉积环境、成岩作用和构造运动对该类型优质储层形成的控制作用.结果表明，研究区钙屑砂岩分选中等—好，成分成熟度低，主要的储集空间为粒间溶孔和残余粒间孔，属特低孔特低渗储层。沉积作用和成岩作用是钙屑砂岩优质储层形成的主控因素。其中，发育在高能相带、且碳酸盐岩岩屑含量高（＞90%）是钙屑砂岩优质储层发育的先决条件；而埋藏成岩过程中有机酸的溶蚀、烃类的早期充注和早期方解石胶结物的少量生成是钙屑砂岩优质储层孔隙保存及次生溶孔形成的关键。
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