牛蹄塘组与龙马溪组页岩细观结构特征研究
投稿时间:2017-08-02  修订日期:2018-11-01  点此下载全文
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作者单位E-mail
陈天宇 东北大学 深部金属矿山安全开采教育部重点实验室 chen_tianyu0526@163.com 
李荣艳 东北大学 深部金属矿山安全开采教育部重点实验室  
周 密 东北大学 深部金属矿山安全开采教育部重点实验室  
王泽栋 东北大学 深部金属矿山安全开采教育部重点实验室  
肖智方 东北大学 深部金属矿山安全开采教育部重点实验室  
郑江捷 东北大学 深部金属矿山安全开采教育部重点实验室  
基金项目:学生创新能力培养与提升计划(03040022116001),国家自然科学基金(51609038),教育部基本科研业务费(N160104002)
中文摘要:我国页岩气储量居世界首位,随着能源的日益紧缺,页岩气开采尤为迫切。页岩内部的孔隙、裂隙结构不仅是页岩气的储存空间,更是影响页岩气产出的关键因素。针对湖南牛蹄塘组和四川龙马溪组页岩样品进行了细观观察,分析了两组页岩的层理、裂隙及孔隙特征,统计了两组页岩的孔隙尺寸及分布特征。实验结果表明:?牛蹄塘组页岩层理特征更为明显,沿层理发育有少量大孔;龙马溪组页岩层理特征不明显,层理多发育小孔;?牛蹄塘组页岩主要发育粘土矿物粒间孔和不同矿物粒间孔,龙马溪组页岩中主要发育不同矿物粒间孔;?两组页岩内主导孔隙直径小于20μm,龙马溪组页岩内直径小于20μm的孔隙出现的频次高于牛蹄塘组页岩相同尺寸孔隙的频次,龙马溪组页岩内直径大于20μm的孔隙出现的频次则高于牛蹄塘组页岩相同尺寸孔隙的频次。
中文关键词:牛蹄塘页岩  龙马溪页岩  裂隙  孔隙  细观特征
 
Study on microstructure characteristics of niutitang shale and longmaxi shale
Abstract:The reserve of Chinese shale gas ranks the first in the world. With the increasing shortage of energy, extracting shale gas is getting particularly urgent. The structure of pore and fissure inside the shale is not only the storage space of shale gas, but also the key factor of the export of shale gas. In this article. The shale samples of Hunan Niutitang Fm and Sichuan Longmaxi Fm were observed through microscope. The bedding, fracture and pore characteristics of the shale samples were analyzed, and the size and distribution feature of pores in the samples were recorded. According to the experimental results, the shale characteristics of Niutitang Fm which has a few macropore along the layer is more apparent, while the shale characteristic of Longmaxi Fm which is likely to appear micropore is not. The Niutitang Fm’s shale mainly develops the intergranular pores of clay minerals and the intergranular pores of different minerals, while the Longmaxi Fm’s shale mainly develops the intergranular pores of different minerals. The dominant pore diameter in the two shale is less than 20μm.The Longmaxi Fm’s shale shows a lower appearing frequency in pores with a diameter less than 20μm, compared to the Niutitang Fm’s. The Longmaxi Fm’s shale shows a higher appearing frequency in pores with a diameter more than 20μm, compared to the Niutitang Fm’s.
keywords:Niutitang Fm shale  Longmaxi Fm shale  fractures  pores  microstructure characteristics.
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