The main oil-bearing series in Youquanzi shallow oil reservoir in western Qaidam basin is Shangyoushashan formation of Neocene (N22), being a lithologic-structural reservoir.

• 柴达木盆地西部油泉子油田浅层油藏的主要含油层系为新近系上新统上油砂山组(N22),为岩性-构造油藏。