Abstract
Hypersaline lake sediments are widely distributed in China and can be good sources for petroleum. The Palaeogene sediments of the Jianghan Basin in Eastern China are a typical example composed of salt lake evaporite-clastic facies in fault-subsided basins. Their organic matter is variable, but is dominated by Type II kerogen. The biological marker characteristics of core extracts and oils from the Jianghan Basin include: (i) low OEP values for n-alkanes and, occasionally, an even-odd predominance, (ii) a high concentration of phytane, (iii) a relatively high gammacerane/17α(H),21β(H)-hopane ratio and (iv) abundant, mainly nickel, porphyrins. Sample Guang-33 (K-33) is typical of the immature oils found in the Jianghan Basin. Geological and geochemical data both indicate that it was generated from source rocks in the maturity range R 0 0.45–0.55%. Its characteristics are similar to those of immature source rocks, with high concentrations of phytane, steranes, triterpanes and nickel porphyrins, and, for an oil, extremely low values for molecular parameters of maturity, such as C 29 20S/(20S + 20R) 14α(H),17α(H)-steranes, C 32 22S/(22S + 22R) 17α(H),21β(H)-hopanes and DPEP/(DPEP + Etio) porphyrins.
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