In the process of shale coring, the gas adsorption will increase the flow resistance of gas inside the core, which will inevitably affect the accuracy of shale gas loss. To clarify the underlying effects of seepage flow and related factors during shale desorption, we conducted an experimental study on the influence of methane on seepage resistance of fractured shale and matrix shale under different adsorption pressures. Changes in reservoir fluid and deformation resulting from CH₄ saturation adsorption resulted in changes in shale permeability. This study investigated six adsorption durations (2, 4, 6, 12, 18, and 24 hours) under adsorption pressures of 5, 9, and 13 MPa in shale samples. During each cycle, different injection pressures (2 to 6 MPa) were applied, and seepage resistance of shale samples was measured by the transient method. The results showed that the permeation resistance of the sample decreased significantly after adsorption of CH₄ reached saturation and decreased with increasing CH₄ adsorption duration. Compared with matrix shale samples, fractured shale samples were shown to have more suitable pore microcracks and higher CH₄ affinity. Therefore, fractured samples were found to have higher permeability resistance and higher adsorption capacity compared to matrix shale. The permeability flow of a sample had a negative exponential relationship with confining pressure, and stress sensitivity increased with increasing CH₄ adsorption time. The model representing gas loss indicated a positive correlation between change in impermeability and the flow of escaped gas on the core surface. A significant reduction in the impermeability of the core will result in a significant reduction in shale gas loss.

在页岩取芯过程中，气体的吸附会增加岩心内部气体的流动阻力，不可避免地影响页岩气损失的准确性。为了阐明页岩解吸过程中渗流的潜在影响及相关因素，我们进行了甲烷对不同吸附压力下页岩和基质页岩抗渗性影响的实验研究。CH ₄引起的储层流体变化和变形饱和吸附导致页岩渗透率发生变化。这项研究调查了页岩样品在5、9和13 MPa吸附压力下的六个吸附持续时间（2、4、6、12、18和24小时）。在每个循环中，施加不同的注入压力（2至6 MPa），并通过瞬态法测量页岩样品的抗渗性。结果表明，样品的渗透阻力在CH ₄吸附达到饱和后显着降低，并随着CH ₄吸附时间的延长而降低。与基质页岩样品相比，裂缝性页岩样品显示出更合适的孔隙微裂纹和更高的CH ₄亲和力。因此，与基质页岩相比，发现破裂的样品具有更高的抗渗透性和更高的吸附能力。样品的渗透流与围压呈负指数关系，应力敏感性随CH ₄吸附时间的增加而增加。代表气体损失的模型表明，不渗透性的变化与岩心表面逸出的气体流量之间呈正相关。岩心不可渗透性的显着降低将导致页岩气损失的显着降低。