OALib Journal期刊
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渤南洼陷沙四上亚段储层异常高孔带及优质储层成因机制
Keywords: 渤南洼陷,沙四上亚段,异常高孔带,优质储层
Abstract:
?渤南洼陷沙四上亚段碎屑岩储层约3000~4000m的深度范围存在明显的异常高孔带。结合岩心实测物性数据,利用连续深度区间的孔隙度分布图和建立的孔隙度—深度拟合曲线确定异常高孔隙带识别标准和分布范围。综合铸体薄片数据、扫描电镜分析、地层压力数据等,从成岩溶蚀、异常高压和早期油气充注等方面阐释异常高孔带成因,并结合沉积微相、岩相和断裂发育等总结相对优质储层成因机制。研究认为储层异常高孔带的发育得益于异常高压对孔隙的保护、中成岩a期有机质低熟阶段的有机酸溶蚀增孔作用和早期烃类充注的保孔作用|异常高孔带的发育、原始沉积因素如优势沉积微相(扇三角洲前缘水下分流河道和分流河口砂坝等)和刚性颗粒(石英、长石和变质岩岩屑等)含量相对高值的中粗粒砂岩以及断裂的发育组成相对优质储层形成的主要条件。?
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