摘要：The sedimentary characteristics of the southwestern part of the Qaidam Basin are complex. So far, the sedimentary facies types and sedimentary models in the region are still controversial. In this paper, we use the rich core data, logging data, mineral test data and regional sedimentary tectonic background in the region to study the sedimentary model of the area. The results show that the lower segment of the Xiaganchaigou Formation (E31) is mainly the western source, followed by the northwest and southwest sources; the Shangganchaigou Formation (N1) is mainly the western source, followed by the northwest and southwest sources; The Xiayoushashan Formation (N21) is mainly the western source, followed by the northwest and southwest sources. The Xiayoushashan Formation (N21) is formed in the underwater environment under weak reduction-weak oxidation conditions; the Shangganchaigou Formation (Ni) is formed in the weak hydrodynamic environment under weak reduction conditions; and the Lower Ganchaigou Formation (E31) is formed in a strong hydrodynamic environment under oxidizing conditions. Finally, the sedimentary facies model of YJ No. 2 Oilfield was established. The YJ No. 2 oilfield developed a braided river and lake sedimentary system. The E31 reservoir is mainly a sedimentary system of the delta plain distributary channel, the E32 develops a lacustrine sedimentary system, the Ni reservoir develops a braided river sedimentary system, and the N21 reservoir mainly develops a braided river sedimentary system.
关键词：Qaidam Basin;core;logging data;mineral testing;sedimentary facies model
