An analytical model to couple gas storage and transport capacity in organic matter with noncircular pores
An analytical model to couple gas storage and transport capacity in organic matter with noncircular pores
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非圆形孔隙有机质气体储运能力耦合分析模型
DOI：
10.1016/j.fuel.2020.117288
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发表时间：
2020-05
期刊：
影响因子：
7.4
通讯作者：
Wang Hui
中科院分区：
文献类型：
--
作者：
Sheng Guanglong;Zhao Hui;Su Yuliang;Javadpour Farzam;Wang Chenchen;Zhou Yuhui;Liu Jinghua;Wang Hui
扫描电子显微镜（SEM）图像说明了页岩储层有机质中可能的孔隙形状的多样性。具有不同几何形状的孔的尺寸为纳米级（10-100 nm），因此润湿表面积与孔体积（比表面积，SSA）的比率高。对于具有高SSA的系统，气体分子与孔壁之间的碰撞变得显著，因此，流体流动不主要由整体流动控制，即，流体-壁面相互作用变得重要。大多数页岩渗透率模型假设圆形纳米孔，导致渗透率预测不佳。提出了一种新的分析显孔隙度和渗透率模型，用于模拟具有非圆形纳米孔隙的页岩气藏的储气和渗透率。SSA和非圆形纳米孔的高度与宽度的纵横比都用于我们的模型中以耦合气体储存和输送能力。我们验证了我们的模型与渗透率值计算的孔隙网络模拟的五个页岩样品从中国江汉盆地。结果表明，纳米孔中的尖锐边缘可以显著地影响渗透性。例如，矩形纳米孔中的气流的非圆度偏差大于具有椭圆形横截面的等效纳米孔。在估算表观孔隙度和渗透率时，圆形横截面纳米孔的假设可能会产生高达55%的误差，具体取决于孔的几何形状。
Scanning Electro Microscope (SEM) images illustrate the variety of possible pore shape in organic matter of shale reservoirs. The size of the pores with different geometries is at nanoscale (10–100 s nm), hence the ratio of wetted surface area to the volume of pores (specific surface area, SSA) is high. For the systems with high SSA the collisions between gas molecules and pore walls become significant, therefore, fluid flow is not dominantly controlled by the bulk flow, i.e., fluid-wall surface interaction becomes important. Most shale permeability models assume circular nanopores that results in poor prediction of permeability. We present a novel analytical apparent porosity and permeability model to model gas storage and permeability in shale gas reservoirs with noncircular nanopores. The SSA and the aspect ratio of height to the width of noncircular nanopores, were both used in our model to couple gas storage and transport capacity. We validated our model with permeability values calculated from pore network simulations of five shale samples from Jianghan Basin of China. The results showed that sharp edges in nanopores could dramatically affect permeability. For examples, the noncircularity deviation of gas flow in a rectangular nanopore is more than an equivalent nanopore with elliptical cross-section. The assumption of circular cross-section nanopores in estimating apparent porosity and permeability could impose up to 55% error depending on the pore geometry.
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作者：
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