## 4 Results
### Characteristics of Mineral Composition
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Sample** & **Depth/m** & **Interval** & **S\({}_{0}\)/mg g\({}^{-1}\)** & **S\({}_{1}\)/mg g\({}^{-1}\)** & **S\({}_{2}\)/mg g\({}^{-1}\)** & **T\({}_{\text{max}}\)/\({}^{\circ}\)C** & **TOC/\%** \\ \hline Z1 & 4451.74 & Q\({}_{2}\) & 0.016 & 0.16 & 0.25 & 380.38 & 0.28 \\ Z2 & 4455.09 & Q\({}_{2}\) & 0.01 & 0.12 & 0.19 & 368.63 & 0.84 \\ Z3 & 4463.15 & Q\({}_{2}\) & 0.017 & 0.63 & 0.47 & 388.88 & 1.55 \\ Z4 & 4466.28 & Q\({}_{2}\) & 0.018 & 0.89 & 0.61 & 394.63 & 0.95 \\ Z5 & 4469.09 & Q\({}_{2}\) & 0.018 & 1.32 & 0.86 & 393.25 & 0.98 \\ Z6 & 4471.31 & Q\({}_{2}\) & 0.004 & 1.11 & 0.88 & 396.50 & 1.31 \\ Z7 & 4480.52 & Q\({}_{2}\) & 0.008 & 2.07 & 1.39 & 403.13 & 1.42 \\ Z8 & 4483.91 & Q\({}_{2}\) & 0.009 & 3.66 & 2.31 & 416.00 & 1.08 \\ Z9 & 4485.82 & Q\({}_{2}\) & 0.007 & 2.69 & 1.80 & 406.50 & 1.42 \\ Z10 & 4486.04 & Q\({}_{2}\) & 0.007 & 0.87 & 0.60 & 406.00 & 1.01 \\ \hline Z11 & 4502.42 & Q\({}_{1}\)\({}^{2}\) & 0.007 & 0.75 & 0.51 & 385.13 & 1.18 \\ Z12 & 4506.37 & Q\({}_{1}\)\({}^{2}\) & 0.009 & 0.37 & 0.36 & 372.38 & 1.23 \\ Z13 & 4548.07 & Q\({}_{1}\)\({}^{2}\) & 0.006 & 0.30 & 0.32 & 374.13 & 1.14 \\ Z14 & 4552.08 & Q\({}_{1}\)\({}^{2}\) & 0.007 & 0.27 & 0.29 & 368.00 & 1.49 \\ Z15 & 4554.15 & Q\({}_{1}\)\({}^{2}\) & 0.008 & 0.29 & 0.35 & 372.50 & 1.71 \\ Z16 & 4555.98 & Q\({}_{1}\)\({}^{2}\) & 0.005 & 0.20 & 0.26 & 366.00 & 1.48 \\ Z17 & 4558.01 & Q\({}_{1}\)\({}^{2}\) & 0.007 & 0.18 & 0.25 & 370.50 & 1.52 \\ Z18 & 4560.21 & Q\({}_{1}\)\({}^{2}\) & 0.009 & 0.16 & 0.22 & 365.50 & 1.38 \\ Z19 & 4572.46 & Q\({}_{1}\)\({}^{2}\) & 0.007 & 0.11 & 0.23 & 377.13 & 1.69 \\ Z20 & 4592.57 & Q\({}_{1}\)\({}^{2}\) & 0.005 & 0.13 & 0.25 & 371.13 & 2.30 \\ Z21 & 4612.22 & Q\({}_{1}\)\({}^{2}\) & 0.005 & 0.13 & 0.24 & 367.75 & 2.14 \\ \hline Z22 & 4749.16 & Q\({}_{1}\)\({}^{1}\) & 0.006 & 0.14 & 0.23 & 361.63 & 0.49 \\ Z23 & 4751.47 & Q\({}_{1}\)\({}^{1}\) & 0.004 & 0.28 & 0.61 & 397.50 & 2.25 \\ Z24 & 4756.96 & Q\({}_{1}\)\({}^{1}\) & 0.005 & 0.71 & 2.18 & 406.50 & 2.35 \\ Z25 & 4758.91 & Q\({}_{1}\)\({}^{1}\) & 0.004 & 0.56 & 1.97 & 402.50 & 1.93 \\ Z26 & 4761.15 & Q\({}_{1}\)\({}^{1}\) & 0.006 & 0.11 & 0.33 & 392.25 & 2.22 \\ Z27 & 4767.74 & Q\({}_{1}\)\({}^{1}\) & 0.008 & 0.09 & 0.26 & 393.75 & 2.28 \\ Z28 & 4769.68 & Q\({}_{1}\)\({}^{1}\) & 0.003 & 0.07 & 0.20 & 385.00 & 2.37 \\ Z29 & 4771.83 & Q\({}_{1}\)\({}^{1}\) & 0.002 & 0.07 & 0.19 & 384.50 & 2.02 \\ Z30 & 4773.93 & Q\({}_{1}\)\({}^{1}\) & 0.001 & 0.07 & 0.19 & 384.00 & 2.32 \\ Z31 & 4777.87 & Q\({}_{1}\)\({}^{1}\) & 0.001 & 0.07 & 0.19 & 384.38 & 2.23 \\ \hline \hline \end{tabular} Caption: Q\({}_{2}\): Qiong 2 member, Q\({}_{1}\)\({}^{2}\): Qiong 1-2 submember, Q\({}_{1}\)\({}^{1}\): Qiong 1-1 submember.  
\end{table} 
Table 1: Organic matter abundance content of shale samples from well Z201 of the Qiongzhusi formation in the southern Sichuan Basin. The primary magnetic processes in the Qiongzhusi formation shale of the Sichuan Basin include compaction, dissolution, replacement, and cementation. With burial depths generally below 5000 m, compaction is intense, often resulting in the fragmentation of brittle minerals into fine components and mineral fractures. The Qiongzhusi formation shale frequently exhibits argillaceous, siliceous, and calcareous cementation, with observable replacement of potassium feldspar by quartz. In terms of dissolution, feldspar dissolution in the Qiongzhusi formation shale is highly developed, featuring irregularly dissolved particle edges and intragranular dissolution pores.