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首页> 外文期刊>Chemical engineering journal >Evaluation of the density and thickness of adsorbed methane in differently sized pores contributed by various components in a shale gas reservoir: A case study of the Longmaxi Shale in Southeast Chongqing, China
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Evaluation of the density and thickness of adsorbed methane in differently sized pores contributed by various components in a shale gas reservoir: A case study of the Longmaxi Shale in Southeast Chongqing, China

机译：在物流储层中各种组分的不同尺寸孔隙中吸附甲烷密度和厚度的评价 - 以中国东南部的龙马西页岩为例

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摘要

To investigate the densities and thicknesses of adsorbed methane in a shale gas reservoir, the Lower Silurian Longmaxi Shale in Southeast Chongqing was selected as a case study to establish models of the pore size distributions contributed by various components (PSDCVC), the amounts of methane adsorbed by various components (AMAVC) and the density and thickness of methane adsorbed by various components (DTMAVC). Based on the results of total organic carbon, carbon content in organic matter (OM), X-ray diffraction, methane isothermal adsorption and low-temperature nitrogen adsorption measurements, the pore size distributions and the amount of methane adsorbed by OM, clay and other minerals were calculated using the PSDCVC and AMAVC models. The average densities and thicknesses of adsorbed methane in pores with widths of < 2 nm, 2-5 nm, 5-10 nm, 10-20 nm, 20-50 nm, 50-100 nm and 100-200 nm associated with OM, clay and other minerals under various conditions (i.e., temperatures of 30-70 degrees C and pressures of 1-10 MPa) were calculated using the DTMAVC model. The calculated data for the three analyzed samples using the PSDCVC and AMAVC models were compared with experimental results to determine the uncertainties of the two models. The density and thickness values of adsorbed methane in pores with various widths associated with OM, clay and other minerals decrease with increasing temperature and pore width and increase with increasing pressure. At the same temperature, pressure and pore width, the density and thickness values of adsorbed methane differ significantly among pores contributed by OM, clay and other minerals, exhibiting a decreasing trend from OM to clay to other minerals.
机译：为了研究Shale气体储层中吸附的甲烷的密度和厚度，选择了东南部的下硅兰龙米星页岩作为建立由各种组分（PSDCVC）贡献的孔径分布模型的案例研究，吸附的甲烷量通过各种组分（AMAVC）和由各种组分吸附的甲烷的密度和厚度（DTMAVC）。基于总有机碳的结果，有机质中的碳含量（OM），X射线衍射，甲烷等温吸附和低温氮吸附测量，孔径分布和OM，粘土和其他吸附的甲烷量使用PSDCVC和AMAVC模型计算矿物质。与OM相关的宽度<2nm，2-5nm，5-10nm，10-20nm，20-50nm，50-100nm和100-200nm的孔中吸附甲烷的平均密度和厚度。使用DTMAVC模型计算粘土和各种条件下的其他矿物质（即，30-70℃的温度和1-10MPa的压力）。将三个分析的样品计算使用PSDCVC和AMAVC模型的计算数据与实验结果进行了比较，以确定两种模型的不确定性。具有与OM，粘土和其他矿物质相关的各种宽度的孔中吸附的甲烷的密度和厚度值随着温度和孔径的增加而降低，随着压力的增加而增加。在相同的温度，压力和孔宽度下，吸附的甲烷的密度和厚度值显着不同，粘土和其他矿物贡献的孔隙中，表现出从OM到其他矿物质的粘土的降低趋势。

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