# Research on an Equivalent Algorithm for Predicting Gas Content in Deep Coal Seams
## 5 Example of Coal Seam Gas Content Prediction
### Basic Parameter Settings  
The Kailuan Group's mine engages in the extraction of coal seams with a thickness ranging from 1.5 to 4.0 m and a dip angle between 10 and 30 degrees. The primary type of coal being mined is coking coal, where Coal Seam 12 exhibits a volatile content of approximately 21%, an average residual gas content of 2.7 m\({}^{3}\)/t, an average monthly output of 52,000 tons from the stope face, and an anticipated initial depth for deep gas content at \(-\)600 m.  
Based on the predictive influence coefficient pertaining to gas emission within Coal Seam 12, a comprehensive assessment of the deep gas content prediction influence coefficient is presented in Table 4. Furthermore, the surplus coefficient k\({}_{\text{f}}\) utilized for the calculation of coal seam gas content has been designated as 1.1.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Influence Factor** & **Factor Subitem** & **Fine Sand** & **Medium Fine Sandstone** & **Medium Sandstone** & **Coarse Sand** & **Clay** & **Thick Mud** \\ \hline \multirow{2}{*}{Equivalent layer} & Basic quantity & & & & & & \\  & m\({}^{3}\)/min & 0.55 & 0.55 & 0.55 & 0.55 & 0.80 & 1.10 \\ \hline \multirow{2}{*}{Coal seam thickness} & \(<\)2 m & 0.95 & 0.95 & 0.95 & 0.95 & 0.95 & 0.95 \\  & 2\(\sim\)4 m & 1 & 1 & 1 & 1 & 1 & 1 \\  & \(>\)4 m & 1.05 & 1.05 & 1.05 & 1.05 & 1.05 & 1.05 \\ \hline \multirow{2}{*}{Dip angle of coal seam} & \(<\)15 & 1.05 & 1.05 & 1.05 & 1.05 & 1.05 & 1.05 \\  & 15\(\sim\)25 & 1 & 1 & 1 & 1 & 1 & 1 \\  & \(>\)25 & 0.95 & 0.95 & 0.95 & 0.95 & 0.95 & 0.95 \\ \hline \multirow{2}{*}{Gas gradient} & \(\leq\)600 m & 0 & 0 & 0 & 0 & 0 & 0 \\  & \(>\)600 & 0.2 & 0.2 & 0.2 & 0.2 & 0.25 \\ \hline \multirow{2}{*}{Synchronial zoning} & Synchronial axis & 0.7 & 0.7 & 0.7 & 0.7 & 0.7 & 0.7 \\  & Middle synchine & 0.8 & 0.8 & 0.8 & 0.8 & 0.8 & 0.8 \\  & Syracilmal margin & 0.9 & 0.9 & 0.9 & 0.9 & 0.9 & 0.9 \\ \hline \multirow{2}{*}{Anticlinal zoning} & Anticlinal axis & 0.7 & 0.7 & 0.7 & 0.7 & 0.7 & 0.7 \\  & Middle part of anticline & 0.8 & 0.8 & 0.8 & 0.8 & 0.8 & 0.8 \\  & Anticlinal margin & 0.9 & 0.9 & 0.9 & 0.9 & 0.9 & 0.9 \\ \hline \multirow{2}{*}{Basin zoning} & Bottom of Basin & 1.6 & 1.6 & 1.6 & 1.6 & 1.6 & 1.6 \\  & Central Basin & 1.5 & 1.5 & 1.5 & 1.5 & 1.5 & 1.5 \\  & basin margin & 1.6 & 1.6 & 1.6 & 1.6 & 1.6 & 1.6 \\ \hline \multirow{2}{*}{Major fault} & Middle part of fault & 1.2 & 1.2 & 1.2 & 1.2 & 1.2 & 1.1 \\  & Fault edge & 1.1 & 1.1 & 1.1 & 1.1 & 1.1 & 1.05 \\  & Rich fault & 1.25 & 1.25 & 1.25 & 1.25 & 1.25 & 1.25 \\ \hline \multirow{2}{*}{Number of small fault layers} & 1\(\sim\)2 & 1.05 & 1.05 & 1.05 & 1.05 & 1.05 & 1.05 \\  & 3\(\sim\)4 & 1.1 & 1.1 & 1.1 & 1.1 & 1.1 & 1.1 \\ \multirow{2}{*}{
\begin{tabular}{c} Subrament size \\ \end{tabular} } & \(\geq\)5 & 1.2 & 1.2 & 1.2 & 1.2 & 1.2 & 1.15 \\  & Reverse fault & 1.2 & 1.2 & 1.2 & 1.2 & 1.2 & 1.3 \\ \hline \hline \end{tabular}  
* Note: The equivalent sandstone zone adopts the parameters of fine sandstone.  
\end{table}
Table 4: Prediction influence coefficient of deep gas content in Coal Seam 12.