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OALib Journal期刊
ISSN: 2333-9721
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东营凹陷北带沙四下亚段深层砂砾岩储层储集空间特征及成因机制
Keywords: 储集空间,成因机制,沙四下亚段,砂砾岩体,东营凹陷北带
Abstract:
？东营凹陷民丰洼陷北带沙四下亚段深层砂砾岩储层储集空间特征及成因机制认识不清的问题，给该地区油气勘探带来了极大的风险。综合运用薄片鉴定、扫描电镜观察、流体包裹体分析及岩心物性分析等多种技术方法，结合压力演化史、油气成藏史、有机质热演化史等研究成果，对东营凹陷北带沙四下亚段砂砾岩储层储集空间特征及成因机制进行了系统研究。结果表明，东营凹陷北带沙四下亚段砂砾岩储层储集空间以残余原生孔隙为主，相对含量占60%以上，含有少量的次生溶蚀孔隙及微裂缝。在早期异常高压、早期油气充注以及膏岩层的发育等多种因素的综合作用下，东营凹陷北带沙四下亚段砂砾岩储层原生孔隙得以有效的保存至深层，从而为油气聚集提供了优质的储集空间；沙四下亚段深层砂砾岩储层经历了酸性→碱性→酸性的溶解过程，溶解作用相对较弱，次生孔隙含量低，对储层物性的贡献量小。？
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