海陆过渡相页岩含气性及气体地球化学特征——以鄂尔多斯盆地山西组页岩为例

发布时间：2018-05-03 19:49

  本文选题：页岩气 + 海陆过渡相　； 参考：《中国矿业大学学报》2017年04期

【摘要】：鄂尔多斯盆地二叠系山西组海陆过渡相页岩是重要的页岩气勘探层位,为了深入研究山西组海陆过渡相页岩含气性及气体地球化学特征,选取2口钻井岩芯样品进行了现场解析气量测定、解析气组分和稳定碳同位素分析以及相关有机地球化学分析,认为山西组海陆过渡相页岩具备页岩气生成的良好地质条件.研究结果表明:山西组页岩有机质丰度较高(TOC为1.73%~3.09%),干酪根类型为Ⅲ型,并处于成熟—高成熟演化阶段;解析气中,甲烷体积分数为80.07%~96.29%,平均值为88.79%,甲烷和乙烷的碳同位素值分别介于-49.2‰~-36.9‰和-17.1‰~-15.4‰之间,碳同位素均具有δ~(13)C_1δ~(13)C_2的正序分布特征,属于有机热成因气;山西组页岩解析气含量平均值为0.38 m3/t,处于已具备页岩气生产能力的四川盆地五峰组—龙马溪组页岩解析气含量范围之内,表明鄂尔多斯盆地山西组海陆过渡相页岩具有较好的页岩气勘探潜力.
[Abstract]:Marine and continental transitional shale of the Permian Shanxi formation in Ordos Basin is an important shale gas exploration horizon. In this paper, two core samples are selected to determine the gas volume in situ, analyze the gas composition, stable carbon isotopes and related organic geochemistry. It is concluded that the marine and continental transitional shale of Shanxi formation has good geological conditions for shale gas generation. The results show that the abundance of organic matter in Shale of Shanxi formation is 1.73 and 3.09, the type of kerogen is type 鈪，

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