Multi-Scale Pore System and Its Implication for Shale Oil Occurrence in Alkaline Lacustrine Mixed Sedimentary Shale Reservoirs: A Case Study from Fengcheng Formation, Mahu Sag, Junggar Basin - Yuanhao Zhang; Zhenxue Jiang; Jiaqi Chang; Zhiye Gao; Liliang Huang; Wenjun He; Chengju Zhang; Lei Chen; Qingqing Fan; Yunhao Han; Bolin Zhang; Chao Chen (Journal of Earth Science, 2026)