## 5 Conclusions  
An approximate analysis of No. 7 and No. 8 coal samples from the Shanxi Formation within the study area indicates these are gas coals characterized by low sulfur, low ash, low fixed-carbon, high volatile matter, and high calorific value. Coal quality correlation analysis reveals a significant negative correlation between ash yield and both fixed-carbon content and calorific value. Significant correlations exist between fixed-carbon and volatile matter yield, and between fixed-carbon and calorific value. A significant positive correlation is observed between total sulfur content and volatile matter yield. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**DHN** & **NCS** & **\(LLD\)** & **\(GR\)** & **\(AC\)** & **\(FC\)-\(PV\) (\%)** & **\(FC\)-\(MV\) (\%)** & **\(AE\) (\%)** & **\(RE\) (\%)** \\ \hline KZ-1 & 8 & 0.32 & 0.40 & 0.05 & 52.66 & 51.23 & 1.43 & 2.79 \\ KZ-4 & 8 & 0.32 & 0.39 & 0.04 & 52.74 & 54.41 & \(-1.67\) & \(-3.07\) \\ KZ-5 & 7 & 0.00 & 0.72 & 0.24 & 51.41 & 49.72 & 1.69 & 3.40 \\ KZ-8 & 8 & 1.00 & 0.11 & 1.00 & 51.56 & 52.08 & \(-0.52\) & \(-1.00\) \\ XZ-1 & 8 & 0.46 & 0.57 & 0.99 & 51.56 & 50.36 & 1.20 & 2.38 \\ XZ-3 & 7 & 0.34 & 0.40 & 0.14 & 50.13 & 47.61 & 2.52 & 5.29 \\ \hline \end{tabular}
\begin{tabular}{c c c c c c c c} \hline
**DHN**, & **\(\rho\)s** & **\(GR\)** & **\(AC\)** & **\(S_{\text{t,d}}\)-\(PV\) (\%)** & **\(S_{\text{t,d}}\)-\(MV\) (\%)** & **\(AE\) (\%)** & **\(RE\) (\%)** \\ \hline KZ-2 & 8 & 0.69 & 0.14 & 0.08 & 0.73 & 0.86 & \(-0.13\) & \(-15.12\) \\ KZ-5 & 7 & 0.52 & 0.44 & 0.04 & 0.65 & 0.65 & 0.00 & 0.00 \\ KZ-8 & 7 & 0.51 & 0.10 & 0.05 & 0.55 & 0.54 & 0.01 & 1.85 \\ XZ-1 & 8 & 0.30 & 0.42 & 0.06 & 0.65 & 0.63 & 0.02 & 3.17 \\ XZ-3 & 8 & 0.03 & 0.72 & 0.09 & 0.89 & 1.03 & \(-0.14\) & \(-13.59\) \\ XZ-7 & 7 & 0.67 & 1.00 & 0.07 & 0.63 & 0.59 & 0.04 & 6.78 \\ \hline \end{tabular}
\end{table} 
Table 6: Error analysis of fixed carbon content in coal. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**DHN** & **NCS** & **\(LLD\)** & **\(GR\)** & **\(CGS\)** & **\(Q_{\text{grad}}\)-\(PV\) (MJ/kg)** & **\(Q_{\text{grad}}\)-\(MV\) (MJ/kg)** & **\(AE\) (\%)** & **\(RE\) (\%)** \\ \hline KZ-1 & 8 & 0.32 & 0.40 & 0.07 & 30.38 & 36.56 & \(-6.18\) & \(-16.90\) \\ KZ-4 & 8 & 0.32 & 0.39 & 0.08 & 30.37 & 32.98 & \(-2.61\) & \(-7.91\) \\ KZ-5 & 7 & 0.00 & 0.72 & 0.00 & 29.93 & 29.02 & 0.91 & 3.14 \\ KZ-8 & 8 & 1.00 & 0.11 & 0.24 & 29.58 & 29.64 & \(-0.06\) & \(-0.20\) \\ XZ-1 & 8 & 0.46 & 0.57 & 0.12 & 29.93 & 30.53 & \(-0.60\) & \(-1.97\) \\ XZ-3 & 7 & 0.34 & 0.40 & 0.08 & 30.36 & 31.79 & \(-1.43\) & \(-4.50\) \\ \hline \end{tabular}
\begin{tabular}{c c c c c c c} \hline
**DHN**, & **\(\rho\)s** & **\(GR\)** & **\(AC\)** & **\(S_{\text{t,d}}\)-\(PV\) (\%)** & **\(S_{\text{t,d}}\)-\(MV\) (\%)** & **\(AE\) (\%)** & **\(RE\) (\%)** \\ \hline KZ-2 & 8 & 0.69 & 0.14 & 0.08 & 0.73 & 0.86 & \(-0.13\) & \(-15.12\) \\ KZ-5 & 7 & 0.52 & 0.44 & 0.04 & 0.65 & 0.65 & 0.00 & 0.00 \\ KZ-8 & 7 & 0.51 & 0.10 & 0.05 & 0.55 & 0.54 & 0.01 & 1.85 \\ XZ-1 & 8 & 0.30 & 0.42 & 0.06 & 0.65 & 0.63 & 0.02 & 3.17 \\ XZ-3 & 8 & 0.03 & 0.72 & 0.09 & 0.89 & 1.03 & \(-0.14\) & \(-13.59\) \\ XZ-7 & 7 & 0.67 & 1.00 & 0.07 & 0.63 & 0.59 & 0.04 & 6.78 \\ \hline \end{tabular}
\end{table} 
Table 7: Error analysis of total sulfur content in coal. \begin{table}
\begin{tabular}{c c c c c c c c} \hline
**DHN** & **NCS** & **\(LLD\)** & **\(GR\)** & **\(AC\)** & **\(FC\)-\(PV\) (\%)** & **\(FC\)-\(MV\) (\%)** & **\(AE\) (\%)** & **\(RE\) (\%)** \\ \hline KZ-1 & 8 & 0.32 & 0.40 & 0.05 & 52.66 & 51.23 & 1.43 & 2.79 \\ KZ-4 & 8 & 0.32 & 0.39 & 0.04 & 52.74 & 54.41 & \(-1.67\) & \(-3.07\) \\ KZ-5 & 7 & 0.00 & 0.72 & 0.24 & 51.41 & 49.72 & 1.69 & 3.40 \\ KZ-8 & 8 & 1.00 & 0.11 & 1.00 & 51.56 & 52.08 & \(-0.52\) & \(-1.00\) \\ XZ-1 & 8 & 0.46 & 0.57 & 0.99 & 51. Analysis of the response relationship between coal quality parameters (moisture, ash, volatile matter, fixed carbon, total sulfur, calorific value) and geophysical logging parameters indicates that a quantifiable relationship exists.