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OALib Journal期刊
ISSN: 2333-9721
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内蒙古东南部林西组页岩气聚集地质条件
Keywords: 内蒙古东南部,林西组,页岩气,聚集条件,有利分布
Abstract:
？内蒙古东南部地区油气勘探程度低，上古生界林西组分布面积广，厚度大，广泛发育暗色泥岩。受大地构造背景控制，该地区林西组被火山岩分隔呈ne—sw向条带状发育出露。页岩分布在平面上存在东部陶海和西部官地2个厚度中心，累计可达700m以上。林西组页岩以ⅱ2—ⅲ等腐殖型干酪根为主；有机质丰度中等，露头页岩样品平均toc值多分布在0.5%~1.0%之间，鲁d1井等局部地区toc值也可超过1.5%；有机质热演化程度相对较高，镜质体反射率(ro)通常超过2%；伊利石结晶度实验表明该页岩处于晚成岩阶段。微观薄片和扫描电镜观察到溶蚀孔、粒间孔和有机质孔等发育。x-衍射分析页岩中的石英和斜长石等脆性矿物含量高，黏土含量一般小于40%，且以伊利石和伊/蒙混层为主组成。综合分析认为该地区有一定的页岩气资源潜力，较有利地区分布在昆都—扎鲁特地区，但进一步勘探需结合重磁力、电法等辅助资料进行综合研究。？
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