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High pressure sorption of various hydrocarbons and carbon dioxide in Kimmeridge Blackstone and isolated kerogen

机译：Kimmeridge Blackstone和分离的干酪根中的各种碳氢化合物和二氧化碳的高压吸附

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We have measured adsorption and desorption of methane, ethane, propane, n-butane, iso-butane and carbon dioxide in Kimmeridge Blackstone at high pressures at temperatures of 60, 90 and 120 degrees C. Sorption of various light hydrocarbons and carbon dioxide in the isolated kerogen at 60 degrees C was also investigated. In our measurements, we used the gravimetric method. Physical and chemical properties of samples were measured to provide insight into sorption. Methane, ethane and carbon dioxide sorption was measured to 150 bar. Due to low vapor pressure of propane at 60 and 90 degrees C, the sorption was measured to 15 bar at 60 degrees C and 30 bar at 90 degrees C, respectively. At 120 degrees C, propane sorption was measured to 30 bar. Similarly, n-butane and iso-butane sorption was studied to 5, 9.5 and 15 bar at 60, 90 and 120 degrees C, respectively. Compared to sorption of these gases at moderate pressure in our recent work, high pressure sorption shows more pronounced hysteresis and non-monotonic excess sorption. In this work, we use the adsorbed layer density, estimated from grand canonical Monte Carlo (GCMC) simulations, and the liquid density to compute the absolute adsorption and examine the difference between the two. The results show that the absolute adsorption estimated with the two densities is significantly different in methane but similar in the other species. The butanes, n-butane and iso-butane, despite close bulk densities have very different adsorption. The adsorbed layer densities by GCMC simulations are different by about 10% which partly account for the adsorption difference. Other mechanisms may be at play due to different shape of the two molecules.
机译：我们已经在60、90和120摄氏度的高温下测量了Kimmeridge Blackstone中甲烷，乙烷，丙烷，正丁烷，异丁烷和二氧化碳的吸附和解吸。各种轻质烃和二氧化碳在还研究了在60摄氏度下分离出的干酪根。在我们的测量中，我们使用了重量分析法。测量样品的物理和化学性质以提供对吸附的了解。甲烷，乙烷和二氧化碳的吸附测量为150 bar。由于丙烷在60和90摄氏度时的蒸汽压低，因此在60摄氏度和90摄氏度时吸附分别测量为15巴和30巴。在120℃下，丙烷吸附测量为30巴。同样，正丁烷和异丁烷的吸附量分别在60、90和120摄氏度下研究到5、9.5和15 bar。与我们最近的工作中在中等压力下吸附这些气体相比，高压吸附显示出更明显的滞后现象和非单调过量吸附。在这项工作中，我们使用从经典的蒙特卡洛（GCMC）模拟得出的吸附层密度和液体密度来计算绝对吸附力，并检查两者之间的差异。结果表明，用两种密度估算的绝对吸附量在甲烷中显着不同，而在其他物种中相似。尽管堆积密度接近，但丁烷，正丁烷和异丁烷具有非常不同的吸附。通过GCMC模拟得出的吸附层密度相差约10％，部分原因是吸附差异。由于两个分子的形状不同，其他机制可能正在发挥作用。

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