*3.1. Materials*

The samples of the Lucaogou Formation in this study are from four cored wells (S1–S4) in the Jimsar Depression (Figure 1B). We selected 42 samples that met experimental needs. Their lithology includes tu ffaceous shale (also called siliceous shale), shale, dolomite, and dolomitic mudstone. Generally, the lithology can be divided into three lithofacies: tu ffaceous shale lithofacies, transitional lithofacies (also called mixed lithofacies), and carbonate lithofacies [41,42].
