Ga/C 30 H shows a decreasing trend in crude oils from the west to the east in the Xiaoliangshan Sag and Mangya Sag of the northwest Qaidam Basin, indicating a gradual decrease in the water stratification degree ( Figure 7 ).
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Geochemical Characteristics and Significance of Molecular Markers in the Paleogene-Neogene Crude Oils of the Northwest Qaidam Basin.
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The ratio of Pr/Ph shows an increasing trend in crude oils from the west to the east in the Xiaoliangshan Sag and Mangya Sag of the northwest Qaidam Basin, indicating a gradual increase in the degree of oxidation ( Figure 7 ).