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OALib Journal期刊
ISSN: 2333-9721
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渝东南地区黔江凹陷五峰组—龙马溪组页岩储层特征及其对含气量的影响
Keywords: 渝东南地区,五峰组&mdash,龙马溪组,储层特征,微观孔隙,扫描电镜,含气性
Abstract:
？渝东南地区黔江凹陷五峰组—龙马溪组页岩气的勘探仍处于初级阶段，储层特征与含气性关系仍不明确，开展五峰组—龙马溪组页岩的储层特征及含气性的研究，对评价研究区页岩气资源潜力具有重要意义。通过采集该套页岩岩心样品，完成详细的储层特征分析和含气性分析测试，包括岩石薄片鉴定、x-射线衍射、toc分析、显微组分实验、氮气吸附实验、扫描电镜实验和现场解析等，结果表明，五峰组—龙马溪组页岩以黏土—粉砂级细粒沉积为主；页岩有机碳含量为0.22%~5.31%，成熟度为1.78%~2.93%，处于高—过成熟阶段，纳米级有机孔隙发育；矿物成分中脆性矿物含量为38.4%~86.7%，黏土矿物含量为12.1%~56.5%，其中微—纳米级无机孔隙较为发育，此外微裂缝的发育也对页岩气聚集和开发提供了有利条件。五峰组—龙马溪组页岩含气量为0.07~2.81m3/t，其底部富有机质页岩的含气量超过1m3/t。综合分析认为页岩toc值和石英含量越高、长石和绿泥石含量越低时页岩中孔隙及比表面积越大，页岩含气量越大。？
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