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首页> 外文期刊>Marine and Petroleum Geology >Heterogeneous nanoporosity of the Silurian Longmaxi Formation shale gas reservoir in the Sichuan Basin using the QEMSCAN, FIB-SEM, and nano-CT methods
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Heterogeneous nanoporosity of the Silurian Longmaxi Formation shale gas reservoir in the Sichuan Basin using the QEMSCAN, FIB-SEM, and nano-CT methods

机译：QEMSCAN，FIB-SEM和nano-CT方法研究四川盆地志留系龙马溪组页岩气储层的非均质纳米孔隙度

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Nanoporosity of a shale gas reservoir provides essential information on the gas accumulation space and controls the gas reserves. The characteristics of heterogeneous nanoporosity of four shale samples are analyzed by combining quantitative evaluation of minerals by scanning electronic microscopy (QEMSCAN), focused ion beam -scanning electron microscopy (FIB-SEM), and nano -CT. The representative elementary area (REA) is proposed by QEMSCAN to detect the imaging area that can represent the overall contents of minerals and organic matter. Combined with the statistics of pores in minerals and organic matter by FIB-SEM, the quantitative nanoporosity is obtained. The nano -CT is used to compare the total nanoporosity that was obtained by FIB-SEM. The results show that shale has distinct characteristics in nanoporosities due to the variation in organic matter and mineral content. The major pore sizes of the organic matter and clay minerals are smaller than 400 nanometers (nm), and the pore sizes of feldspar and pyrite are mainly 200-600 nm. The pore sizes for pores developed in quartz and carbonate minerals range from a few nanometers to 1000 nm. Furthermore, pores smaller than 400 nm mainly provide the total nanoporosity. The nanoporosities in the organic matter are approximately 17%-21%. Since the organic matter content (0.54%-6.98%) is low, the organic matter contributes approximately 5%-33% of the total nanoporosity in shale. Conversely, the nanoporosities in quartz and clay are generally lower than 3%. Since the mineral content (93.02%-99.46%) is obviously higher than the organic matter content, the minerals contribute approximately 67%-95% of the total nanoporosity in shale. (C) 2016 Elsevier Ltd. All rights reserved.
机译：页岩气藏的纳米孔隙度提供了有关天然气聚集空间的基本信息，并控制了天然气储量。通过结合扫描电子显微镜（QEMSCAN），聚焦离子束扫描电子显微镜（FIB-SEM）和纳米CT的矿物定量评估，分析了四个页岩样品的非均质纳米孔隙特征。 QEMSCAN提出了代表性基本区域（REA），以检测可以代表矿物质和有机物总含量的成像区域。结合FIB-SEM对矿物和有机质中孔隙的统计，获得了定量的纳米孔隙度。纳米-CT用于比较通过FIB-SEM获得的总纳米孔隙率。结果表明，由于有机质和矿物质含量的变化，页岩在纳米孔隙中具有独特的特征。有机质和粘土矿物的主要孔径小于400纳米（nm），长石和黄铁矿的孔径主要为200-600 nm。石英和碳酸盐矿物中形成的孔的孔径范围从几纳米到1000 nm。此外，小于400nm的孔主要提供总的纳米孔。有机物中的纳米孔隙率约为17％-21％。由于有机质含量较低（0.54％-6.98％），因​​此有机质占页岩总纳米孔隙度的大约5％-33％。相反，石英和粘土中的纳米孔隙率通常低于3％。由于矿物质含量（93.02％-99.46％）明显高于有机物含量，因此矿物质占页岩总纳米孔隙度的约67％-95％。 （C）2016 Elsevier Ltd.保留所有权利。

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