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A STUDY ON THE EFFECT OF GAS SHALE COMPOSITION AND PORE STRUCTURE ON METHANE SORPTION
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.jngse.2018.12.009
Santanu Bhowmik , Pratik Dutta

Abstract Ten moist, powdered European shale samples were analyzed for their sorption properties by volumetric method. The adsorption capacities were correlated to the shale organic types and maturity. The pore-size distribution obtained from low-pressure CO2 micropore adsorption was also correlated with the porosity and shale organic types. Furthermore, pore volume and average pore width were taken into consideration to determine the dominant parameters controlling adsorption. To identify the discrepancy between available and actual pore space for adsorption, helium and krypton gases were used for void volume estimation. Methane adsorption isotherms follow Langmuir Type I behavior and, in general, showed a positive trend with Total Organic Content (TOC) and Hg-porosity although some deviations were also observed. Low to moderate level of hysteresis between adsorption and desorption isotherms for some samples was visible, which may be attributed to the experimental uncertainty and existence of heterogeneous pores for shale-methane interaction. The low-pressure micropore adsorption analysis indicated dominance of nanopore and very fine micropores in the shale matrix structure along with associated microporosity of the clay materials. The observed “negative” adsortion or “decline” in adsorption isotherm are related to the mismatch of the available pore spaces for helium and methane. In general, He-calibrated isotherms showed higher levels of adsorption than the corresponding Kr-calibrated isotherms although the unit void volume for all samples follow a negative trend with the maximum methane capacity.

中文翻译:

页岩组成和孔隙结构对甲烷吸附的影响研究

摘要 通过体积法分析了 10 个潮湿的粉状欧洲页岩样品的吸附特性。吸附能力与页岩有机质类型和成熟度相关。从低压 CO2 微孔吸附获得的孔径分布也与孔隙度和页岩有机类型相关。此外,考虑孔体积和平均孔宽来确定控制吸附的主要参数。为了确定可用和实际吸附孔隙空间之间的差异,使用氦气和氪气来估计空隙体积。甲烷吸附等温线遵循 Langmuir I 型行为,总体上显示总有机物含量 (TOC) 和汞孔隙率的正趋势,但也观察到一些偏差。一些样品的吸附和解吸等温线之间存在低到中等水平的滞后现象,这可能是由于实验的不确定性和页岩-甲烷相互作用的非均质孔隙的存在。低压微孔吸附分析表明,在页岩基质结构中,纳米孔和非常细的微孔占主导地位,以及粘土材料的相关微孔。观察到的“负”吸附或吸附等温线的“下降”与氦气和甲烷的可用孔隙空间不匹配有关。通常,He 校准的等温线显示出比相应的 Kr 校准的等温线更高的吸附水平,尽管所有样品的单位空隙体积都遵循最大甲烷容量的负趋势。
更新日期:2019-02-01
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