In order to understand the pore structures of the Middle Jurassic Xishanyao Formation in the Junggar Basin, 11 shale samples from a single well were picked and were subjected to several analyses including mineralogy, (programmed) Rock-Eval pyrolysis for geochemical and N₂ adsorption for pore structure analysis. The results showed that the mean value of total organic carbon (TOC) content of these samples is around 1.54% while T_max varies between 429 to 443°C, indicating they are in the oil window. Mineral assemblages of the samples is mainly quartz and clay (illite, chlorite and kaolinite). Moreover, negative correlations between the K-feldspar/plagioclase and micro-mesopore volume was found, depicting that few of such pore sizes exist in these two abundant minerals. In contrast, micro, meso and macro pores all were detected in clay minerals. Particularly, the pores with radii of around 5.35 nm were abundant in clay minerals and there was not a robust relationship between the organic matter, surface area and pore volume. Finally, fractal analysis was performed to better delineate heterogenous characteristics of pore structures which showed that D₂ (representing the larger pores) is greater than D₁ (smaller pores). In addition, the differences between the fractal dimensions of the adsorption and desorption (D_2d–D_2a) branches to better interpret the hysteresis, was defined. The positive correlation between the (D_2d–D_2a) and the meso-macro pore volume, pointed out that the meso-macro condensation is the main reason for hysteresis that was observed in N₂ adsorption experiments in the Xishanyao Shale samples.

为了了解准gar尔盆地中侏罗统西山窑组的孔隙结构，从单口井中采集了11个页岩样品，并进行了矿物学分析，（程序）岩石-Eval热解的地球化学分析和N ₂吸附分析。孔结构分析。结果表明，这些样品的总有机碳（TOC）含量平均值约为1.54％，而T _max在429至443°C之间变化，表明它们在油窗内。样品的矿物组合主要是石英和粘土（伊利石，绿泥石和高岭石）。此外，发现钾长石/斜长石和微中孔体积之间存在负相关关系，这表明在这两种丰富的矿物中几乎没有这种孔径存在。相反，在粘土矿物中都检测到了微孔，中孔和大孔。尤其是，粘土矿物中半径为5.35 nm左右的孔丰富，有机物，表面积和孔体积之间没有牢固的关系。最后，进行分形分析以更好地描绘孔结构的异质性，结果表明D ₂（代表较大的孔）大于D ₁（毛孔较小）。此外，定义了吸附和解吸分支的分形维数（D _2d –D _2a）之间的差异，以更好地解释磁滞现象。（D _2d –D _2a）与细观宏观孔隙之间的正相关关系，指出细观宏观凝结是西山窑页岩样品在N ₂吸附实验中观察到的滞后的主要原因。