Fig. 1. Distribution of bitumen in reservoir (well Antan 4×, 4 842.95 m)

Fig. 2. Raman spectra of bitumen in reservoirs

Fig. 3. Raman spectroscopic parameters of bitumen and Diagram of fitting peaks
(a): Raman spectroscopic parameters of bitumen (After Wilkins et al., 2014); (b): Diagram of fitting peaks; H is the peak height; W is the peak width of half maximum; S is the lowest height between peak D and peak G; H'/S is the saddle index

Fig. 4. Buried history of well Antan 4× of Yangshuiwu buried hill and stages of oil and gas accumulation

Fig. 5. Relationship between the evolution of organic matters maturity and hydrocarbon types (After Maria Mastalerz et al., 2018)