Enhanced estimation of total organic carbon in the longmaxi shale formation using supervised machine learning with lithofacies characterization via K-means clustering - Shaukat Khan; Zhishui Liu; Zhiqiang Lu; Wakeel Hussain; Sohail Ahmed; Muhammad Sajid; Hafiz Hussain Ahmad; Obaidullah; Imdadullah (Carbonates and Evaporites, 2026)