## 3 Rock 3D Structure Creation
### Simulation Study of One-Way Entrance without Wall Seepage
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Entrance Surface** & \begin{tabular}{c} **Average Entance** \\ **Velocity (m/s)** \\ \end{tabular} & \begin{tabular}{c} **Exit** \\ **Surface** \\ \end{tabular} & \
\begin{tabular}{c} **Exit Velocity (m/s)** \\ \end{tabular} &
\begin{tabular}{c} **Average Exit** \\ **Velocity (m/s)** \\ \end{tabular} \\ \hline \multirow{4}{*}{X} & \multirow{4}{*}{34.583} & \(-\)X & 7.026 & \multirow{4}{*}{20.6018} \\  & & Y & 12.702 & \\  & & \(-\)Y & 15.977 & \\  & & Z & 35.866 & \\  & & \(-\)Z & 31.438 & \\ \hline \multirow{4}{*}{\(-\)X} & \multirow{4}{*}{42.748} & \(\chi\) & 5.269 & \multirow{4}{*}{17.6374} \\  & & Y & 26.690 & \\  & & \(-\)Y & 24.719 & \\  & & \(Z\) & 7.797 & \\  & & \(-\)Z & 23.712 & \\ \hline \multirow{4}{*}{Y} & \multirow{4}{*}{45.422} & \(\chi\) & 12.682 & \multirow{4}{*}{20.865} \\  & & \(-\)X & 29.116 & \\  & & \(-\)Y & 10.168 & \\  & & \(Z\) & 30.282 & \\  & & \(-\)Z & 22.077 & \\ \hline \multirow{4}{*}{\(-\)Y} & \multirow{4}{*}{43.740} & \(\chi\) & 28.140 & \multirow{4}{*}{20.1734} \\  & & \(-\)X & 17.460 & \\  & & \(\chi\) & 9.063 & \\  & & \(Z\) & 27.752 & \\  & & \(-\)Z & 18.452 & \\ \hline \multirow{4}{*}{Z} & \multirow{4}{*}{40.490} & \(\chi\) & 23.620 & \multirow{4}{*}{13.4746} \\  & & \(-\)X & 5.464 & \\ \cline{1-1}  & & \(14.505\) & \\ \cline{1-1}  & & \(-\)Y & 17.860 & \\ \cline{1-1}  & & \(-\)Z & 5.924 & \\ \hline \multirow{4}{*}{\(-\)Z} & \multirow{4}{*}{46.331} & \(\chi\) & 18.280 & \multirow{4}{*}{22.8756} \\  & & \(-\)X & 37.607 & \\ \cline{1-1}  & & \(31.675\) & \\ \cline{1-1}  & & \(-\)Y & 18.366 & \\ \cline{1-1}  & & \(Z\) & 8.450 & \\ \hline \hline \end{tabular}
\end{table} 
Table 11: The distribution of seepage velocity on each exit surface under different seepage entrance surface conditions. Y \(>-Z>-X\). This shows that the +X exit surface was the best percolation exit surface for the \(-Y\) entrance. A total of 29.62% of the fluid entering from the +Z plane flowed out from the exit of the \(-Y\) plane, and the proportion of the fluid at each exit plane was in the order of \(-Y>+X\) \(>+Y>-Z>-X\). This shows that the \(-Y\) exit surface was the best percolation exit surface of the +Z entrance. A total of 27.56% of the fluid that entered from the \(-Z\) plane flowed out from the exit of the +Y plane, and the proportions of the fluid at each exit surface were in the order of \(+Y>-X>+X>-Y>Z\). This shows that the +Y exit surface was the best percolation exit surface of the \(-Z\) entrance. The pore channel from the entrance surface to the optimal percolation exit surface is called the optimal percolation surface channel. The best seepage surface channels corresponding to different entrance surfaces are \(+X\rightarrow-Y\), \(-X\rightarrow+Y\), \(+Y\rightarrow-X\), \(-Y\rightarrow+X\), \(+Z\rightarrow-Y\), and \(-Z\rightarrow+Y\). Among the six groups of best seepage surface channels, up to 46.47% of the fluid passed through the \(-X\rightarrow+Y\) seepage surface channel. This value was the highest proportion of fluid passing through the seepage channels corresponding to all entrance surfaces. This pore channel was the easiest channel for fluid to pass through. From Table 11, it was found that due to the difference in pore structure development, the corresponding seepage velocities of different entrance faces were quite different. The velocity of the seepage entrance was between 34.58 m/s and 46.33 m/s, and the velocity of the seepage exit was between 13.47 m/s and 22.88 m/s. The order of the speed of each entrance surface was \(-Z>+Y>-Y>-X>+Z>+X\). The factor that affected the velocity of the entrance surface was the area of the pores participating in the seepage. The pore area of the entrance surface participating in the seepage characteristic was negatively correlated with the seepage velocity; that is, the +X pore area participating in the seepage characteristic in each seepage entrance surface was larger, and the pore development was better.