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Effect of the properties of Silurian shales from the Barrandian Basin on their methane sorption potential

机译：Barrandian盆地志留系页岩的性质对其甲烷吸附潜力的影响

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High-pressure methane sorption isotherms were measured on seven representative samples of Silurian shales from the Barrandian Basin, Czech Republic. Excess sorption measurements were performed at a temperature of 45 degrees C and at pressures up to 15 MPa on dry samples, using a manometric method. Experimental methane high-pressure isotherms were fitted to a modified Langmuir equation. The maximum measured excess sorption parameter (n(max)) and the Langmuir sorption capacity parameter (nL) were used to study the effect of TOC content, organic maturity, inorganic components and pore size distribution on the methane sorption capacity. The values of nmax ranged from 0.050 to 0.088 mmol. g (1), and the values of nL ranged from 0.068 to 0.133 mmol. g (1). The studied shale samples with random reflectance R-r of graptolite 0.56-1.76% had a very low TOC content from 0.34 to 2.37 wt% and dominant mineral fractions. Illite was the prevailing clay mineral (0-51%). Organic matter of the Silurian black shales was consisted of residues of graptolites, chitinozoans, two types of bitumen including dispersed and massive bitumens, recycled organic matter, and organic detritus. In the shales, the occurrence of fractures parallel with the original sedimentary bending was highly significant. A greater proportion of fragments of carbonaceous particles of graptolites and bitumens in the Barrandian shales had a smooth surface without pores. The sample porosity Por(calc) ranged from 4.6 to 18.8%. In most samples, the micropore volumes were markedly lower than the meso-and macropore volumes. No relation has been proven between TOC-normalized excess sorption capacities or the TOC-normalized Langmuir sorption capacities and thermal maturation of the shales. The methane sorption capacities of shale samples show a positive correlation with TOC and a positive correlation with the clay content. The assumption that the sorption capacity is a function mainly of the microporous system of shales was not confirmed. The highest sorption capacity was observed in shale samples with the lowest volume of micropores and the highest TOC content, indicating that the organic matter content and the microporosity of clay minerals are the principal factors affecting the sorption capacity of shale samples. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在来自捷克共和国巴兰迪安盆地的七个志留系页岩样品上测量了高压甲烷吸附等温线。使用测压法在干燥样品上于45摄氏度的温度和最高15 MPa的压力下进行了过量的吸附测量。将甲烷的高压等温线拟合为修正的Langmuir方程。使用测得的最大过量吸附参数（n（max））和Langmuir吸附容量参数（nL）来研究TOC含量，有机成熟度，无机成分和孔径分布对甲烷吸附容量的影响。 nmax的值在0.050至0.088mmol的范围内。 g（1），nL的范围为0.068至0.133 mmol。 g（1）。研究的页岩样品的滑石含量为R6-r的随机反射率R-r为0.56-1.76％，其TOC含量非常低，为0.34至2.37 wt％，并且占主要矿物质组分。伊利石是主要的粘土矿物（0-51％）。志留纪黑色页岩的有机物由残渣，奇脱藻岩，两种类型的沥青组成，包括分散的和块状的沥青，可循环利用的有机物和有机碎屑。在页岩中，与原始沉积弯曲平行的裂缝的发生非常重要。在Barrandian页岩中，较大比例的石墨石和沥青的碳质颗粒碎片具有光滑的表面，没有孔。样品孔隙度Por（calc）为4.6％至18.8％。在大多数样品中，微孔体积明显低于中孔和大孔体积。在页岩的TOC归一化的过量吸附能力或TOC归一化的Langmuir吸附能力之间没有关系。页岩样品的甲烷吸附能力与TOC呈正相关，与粘土含量呈正相关。没有证实吸附能力主要是页岩微孔系统的功能这一假设。页岩样品具有最小的微孔体积和最高的TOC含量，具有最高的吸附能力，这表明有机质含量和粘土矿物的微孔率是影响页岩样品吸附能力的主要因素。 （C）2017 Elsevier Ltd.保留所有权利。

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