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湘鄂西地区下寒武统牛蹄塘组页岩气聚集条件及含气性影响因素

Marine Origin Petroleum Geology(2018)

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Abstract
以钻井、野外露头测量、实验测试数据为资料依据,通过对湘鄂西地区下寒武统牛蹄塘组页岩有机碳含量、热演化程度、矿物含量、储集特征等的分析,认为牛蹄塘组页岩全区分布,富有机质页岩发育于牛蹄塘组中下部,分布稳定,厚度介于40~150m之间;有机碳含量高,介于2.0%~14.64%之间;热演化程度高,主体大于2.0%以上,综合评价页岩品质好.等温吸附实验表明,牛蹄塘组页岩具有较强的天然气吸附能力.现场解吸实验表明,牛蹄塘组含气量整体偏低且氮气含量高.多期构造运动的改造和大型通天断层的发育是影响牛蹄塘组页岩含气性的主要因素,过高的热演化程度对含气性亦有一定影响.
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Key words
Western Hu'nan,Western Hubei,Cambrian,Niutitang Formation,Shale gas,Influencing factor
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