The permeability and its horizontal anisotropy induce a critical influence on staged CH₄ output inhibition process. However, a quantitative evaluation of this influence has been rarely reported in the literature. In this work, the impact of horizontal anisotropic permeability on CO₂-ECBM was numerically investigated. The variation in the staged CH₄ output inhibition was analyzed. The ideal displacement profile of the CO₂-ECBM process was established for the first time. Moreover, the variation in CH₄ output of different wellbores was discussed. The results showed that 1) low-permeable or weak-anisotropic reservoirs were not conducive to enhanced CH₄ recovery owing to long inhibition time (> 1091 days) and high inhibition level (> 36.9%). As permeability and anisotropy increased, due to the accelerated seepage of free water, the hysteresis time and inhibition time could decrease to as short as 5 days and 87 days, respectively, and the inhibition level could weaken to as low as 5.00%. Additionally, the CH₄ output and CO₂ injection could increase significantly. 2) Nevertheless, high permeability and strong anisotropy easily induced CO₂ breakthrough, resulting in lower CH₄ production, CO₂ injection and CO₂ storage than expected. While maintaining high efficiency of CO₂ storage (> 99%), upregulating CO₂ breakthrough concentration from 10% to 20% might ease the unfavorable trend. 3) Along the direction of fluid flow, the ideal displacement profile consisted of CO₂ enriched bank, CO₂ and CH₄ mixed bank, CH₄ enriched bank, and water enriched bank, whereas a remarkable gap in the displacement profiles of the dominant and non-dominant seepage directions was observed. 4) The potential of CH₄ output might vary greatly among different wellbores. The producers along the dominant seepage direction held more potential for CH₄ recovery in the short-term, while those along the non-dominant seepage direction avoided becoming invalid only if a long-time injection measure was taken for the injectors. These findings pave the way to understand fluid seepage in real complex reservoirs during CO₂-ECBM and conduct further field projects.

渗透率及其水平各向异性对阶段性CH ₄输出抑制过程产生关键影响。然而，文献中很少报道这种影响的定量评估。在这项工作中，数值研究了水平各向异性渗透率对CO ₂ -ECBM的影响。分析了阶段性CH ₄输出抑制的变化。首次建立了CO ₂ -ECBM工艺的理想驱替曲线。此外，还讨论了不同井筒CH ₄产量的变化。结果表明：1）低渗透或弱各向异性油藏抑制时间长（>1091天）、抑制水平高（>36.9%），不利于提高CH _{4采收率。}随着渗透率和各向异性的增加，由于自由水渗流加速，滞后时间和抑制时间可分别缩短至短至5天和87天，抑制水平可减弱至低至5.00%。另外，CH ₄产量和CO ₂注入量可以显着增加。2）然而，高渗透率和强各向异性很容易引起CO ₂突破，导致CH ₄产量、CO ₂注入和CO ₂封存低于预期。_{在保持高CO 2}储存效率（> 99%）的同时，将CO ₂突破浓度从10%上调至20%可能会缓解不利趋势。3)沿流体流动方向,理想驱替剖面由CO ₂富集岸、CO ₂与CH ₄混合岸、CH ₄富集岸、富水岸组成,而主导与富水岸的驱替剖面差距较大。观察到非主导渗流方向。4）不同井筒CH ₄产出潜力可能存在较大差异。沿主导渗流方向的生产井在短期内具有更大的CH 4 回收潜力，而沿非主导渗流方向的生产井只有对注入井采取长期注入措施才能避免失效_{。这些发现为了解 CO 2} -ECBM 期间真实复杂储层中的流体渗流并开展进一步的现场项目铺平了道路。