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OALib Journal期刊
ISSN: 2333-9721
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陆相页岩孔隙类型、特征及油气共聚过程探讨——以辽河坳陷西部凹陷为例
Keywords: 陆相页岩,宏观孔隙,微观孔隙,油气共聚,聚集过程
Abstract:
？借助岩心描述、氩离子抛光扫描电镜对以辽河坳陷西部凹陷为代表的陆相页岩中不同尺度储集空间类型、特征进行了研究，并探讨了页岩油气的聚集过程。结果表明，研究层段发育溶蚀孔缝、构造缝等有利于页岩油聚集和运移的大孔径孔洞和裂缝。扫描电镜下，研究层段发育无机矿物孔、有机质孔及微裂缝3种微观孔隙类型，其中低成熟度条件下大孔径有机质孔的形成主要与有机酸的溶蚀改造有关。对微裂缝的研究表明，有机质边缘和内部可以发育多种形态裂缝，而有机质内部生排烃裂缝的大量发育则是陆相低成熟度页岩与南方高成熟度页岩的重要区别。研究区陆相页岩有机质正处于生油气高峰阶段，油气共存，聚集机理较为复杂。吸附态页岩气主要赋存于有机质和黏土矿物内外表面，溶解态页岩气则主要在原油的携带下逐渐在整个页岩段的宏观、微观孔隙中富集，并将油气在页岩层段的聚集过程分为以生物气聚集、油气微观聚集、油气宏观聚集和页岩层段富集为特征的4个阶段。
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