Characteristics and indication of hydrocarbon-generating organisms in sub-salt Majiagou Formation of well T112, central and eastern Ordos Basin - Yinuo ZHANG; Dongdong ZHANG; Liubin WEI; Wenhui LIU; Pingping SHI; Xiaofeng WANG; Qian ZHANG; Yining LI; Zhicheng JIN (Shiyou shiyan dizhi, 2025)