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岩性油气藏 ›› 2018, Vol. 30 ›› Issue (5): 29–39.doi: 10.12108/yxyqc.20180504
孟凡洋1, 陈科1, 包书景1, 李浩涵1, 张聪1,2, 王劲铸1
MENG Fanyang1, CHEN Ke1, BAO Shujing1, LI Haohan1, ZHANG Cong1,2, WANG Jinzhu1
摘要： 我国南方地区广泛发育厚度大、有机质含量高的下寒武统海相页岩，但影响页岩含气性的主控因素仍不明确。湘西北复杂构造区下寒武统牛蹄塘组页岩沉积厚度大且埋深适中，在优选出的慈利景龙桥向斜内钻探的页岩气参数井——慈页1井，富有机质泥页岩厚度为149 m，对岩心进行取样，并开展了总有机碳含量、镜质体反射率、矿物成分、储集物性等测试分析，揭示了牛蹄塘组页岩总有机碳质量分数平均为4.83%，底部总有机碳质量分数大于3.0%的连续优质页岩厚达37 m，页岩镜质体反射率（Ro）平均为3.28%。采用岩心直接解吸法测得牛蹄塘组页岩总含气质量体积为0.859 m3/t，天然气成分中甲烷质量分数平均为78.23%。通过分析湘西北慈利地区构造演化特征，并将慈页1井与周边钻遇的下寒武统页岩钻井关键参数进行对比，阐明影响湘西北地区下寒武统页岩含气性的主控因素为构造保存条件和页岩演化程度。南方雪峰山隆起、黄陵背斜和汉南古陆等古隆起周缘基底稳定，构造保存条件较好，页岩成熟度相对较低，是未来复杂构造区页岩气勘探的重点地区。
中图分类号:
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