The study of the oil source in Xiaoliangshan Sag, Northwestern Qaidam Basin, China

摘要

The geochemical characteristics of the crude oil in the northwestern and southwestern Qaidam Basin and the Tertiary source rocks of Xiaoliangshan Sag were compared and analyzed. The results show that the Tertiary source rocks of N_1 and E_3~2 are the best two sets of source rocks in Xiaoliangshan Sag. The crude oil of the northwestern Qaidam Basin is sourced from nearby Xiaoliangshan Sag rather than Mangya Sag. The crude oil of N_2~2 in the shallow strata of Nanyishan, Jiandingshan and Xiaoliangshan are mainly sourced from the source rocks of N_1; while the crude oil of E_3~2 in the deep strata is mainly sourced from the source rocks of E_3~2.