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Microscopic Pore Structure Characteristics and Methane Adsorption of Vitrain and Durain
Geofluids ( IF 1.7 ) Pub Date : 2020-11-22 , DOI: 10.1155/2020/8887230 Fu Yang 1, 2, 3 , Dongmin Ma 1, 3 , Zhonghui Duan 1, 2 , Dazhong Ren 1, 4 , Tao Tian 1, 2 , Dengke Liu 1, 5
Geofluids ( IF 1.7 ) Pub Date : 2020-11-22 , DOI: 10.1155/2020/8887230 Fu Yang 1, 2, 3 , Dongmin Ma 1, 3 , Zhonghui Duan 1, 2 , Dazhong Ren 1, 4 , Tao Tian 1, 2 , Dengke Liu 1, 5
Affiliation
During reservoir evaluation, the microscopic pore structure of low-rank coal is mainly characterized in order to study the coalbed methane diffuse and migration mechanisms and control. The low-rank coals are very different in pore type and size, so it is necessary to use various techniques to describe their pore structure. For vitrain and durain of the Coal Member of the Yan’an Formation from Huanglong Coalfield, their chemical composition and microscopic pore structure characteristics were studied, and the factors of influencing the pore size distribution (PSD) were explored. Obviously, vitrain and durain are different in chemical composition. Vitrain has higher moisture content, volatile yield, and vitrinite group content than durain. Vitrain and durain mainly contain vitrinite and inertinite, respectively. The pore structure characteristics (e.g., pore types and PSD) of vitrain and durain were systematically by mercury intrusion porosimetry (MIP), low-temperature nitrogen adsorption, and carbon dioxide (CO2) adsorption. The vitrain and durain samples with a micropore size of <2 nm were mainly tested on their specific surface area (SSA) and pore volume (PV). The results show that microporous vitrain has larger SSA and PV than microporous durain, while mesoporous and macroporous vitrain has smaller SSA and PV than mesoporous and macroporous durain. SSA is very positively correlated with PV. The ash content is negatively correlated with SSA and PV. The ash content influences microporous vitrain more greatly than microporous durain, but mesoporous and macroporous durain more greatly than mesoporous and macroporous vitrain. SSA is positively correlated with the vitrinite content of durain and negatively correlated with the inertinite and exinite contents of durain. However, SSA is negatively correlated with the vitrinite and exinite contents of vitrain and positively correlated with the inertinite content of vitrain. Vitrain has higher methane adsorption capacity, desorption rate, and recovery ratio than durain. There are parameters that are obviously affected by the micropore characteristics.
中文翻译:
Vitrain和Durain的微观孔隙结构特征和甲烷吸附
在储层评价中,主要表征低阶煤的微观孔隙结构,以研究煤层气扩散运移机制和控制。低阶煤的孔隙类型和大小差异很大,因此需要使用各种技术来描述它们的孔隙结构。对黄龙煤田延安组煤段的砂轮和砂轮进行化学成分和微观孔隙结构特征研究,探讨影响孔径分布(PSD)的因素。显然,vitrain和durain在化学成分上是不同的。Vitrain 比 durain 具有更高的水分含量、挥发物产率和镜质组含量。Vitrain和durain分别主要含有镜质体和惰性体。孔隙结构特征(例如 例如,通过压汞孔隙率法 (MIP)、低温氮吸附和二氧化碳 (CO2) 吸附,系统地分析了 vitrain 和 durain 的孔隙类型和 PSD。微孔尺寸 <2 nm 的 vitrain 和 durain 样品主要测试其比表面积 (SSA) 和孔体积 (PV)。结果表明,微孔vitrain比微孔durain具有更大的SSA和PV,而中孔和大孔vitrain的SSA和PV小于介孔和大孔durain。SSA 与 PV 非常正相关。灰分含量与 SSA 和 PV 呈负相关。灰分含量对微孔玻璃体的影响比微孔玻璃体大,但中孔和大孔玻璃体比中孔和大孔玻璃体更大。SSA与durain的镜质体含量呈正相关,与durain的惰性和非晶质含量呈负相关。然而,SSA与镜质体的镜质体和外质体含量呈负相关,与镜质体的惰性含量呈正相关。Vitrain 比 durain 具有更高的甲烷吸附能力、解吸率和回收率。存在明显受微孔特性影响的参数。
更新日期:2020-11-22
中文翻译:
Vitrain和Durain的微观孔隙结构特征和甲烷吸附
在储层评价中,主要表征低阶煤的微观孔隙结构,以研究煤层气扩散运移机制和控制。低阶煤的孔隙类型和大小差异很大,因此需要使用各种技术来描述它们的孔隙结构。对黄龙煤田延安组煤段的砂轮和砂轮进行化学成分和微观孔隙结构特征研究,探讨影响孔径分布(PSD)的因素。显然,vitrain和durain在化学成分上是不同的。Vitrain 比 durain 具有更高的水分含量、挥发物产率和镜质组含量。Vitrain和durain分别主要含有镜质体和惰性体。孔隙结构特征(例如 例如,通过压汞孔隙率法 (MIP)、低温氮吸附和二氧化碳 (CO2) 吸附,系统地分析了 vitrain 和 durain 的孔隙类型和 PSD。微孔尺寸 <2 nm 的 vitrain 和 durain 样品主要测试其比表面积 (SSA) 和孔体积 (PV)。结果表明,微孔vitrain比微孔durain具有更大的SSA和PV,而中孔和大孔vitrain的SSA和PV小于介孔和大孔durain。SSA 与 PV 非常正相关。灰分含量与 SSA 和 PV 呈负相关。灰分含量对微孔玻璃体的影响比微孔玻璃体大,但中孔和大孔玻璃体比中孔和大孔玻璃体更大。SSA与durain的镜质体含量呈正相关,与durain的惰性和非晶质含量呈负相关。然而,SSA与镜质体的镜质体和外质体含量呈负相关,与镜质体的惰性含量呈正相关。Vitrain 比 durain 具有更高的甲烷吸附能力、解吸率和回收率。存在明显受微孔特性影响的参数。