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Characteristics of Rearranged Hopanes of Hydrocarbon Source Rocks in Saline Sedimentary Environment: A Case Study of the Songliao Basin

The Songliao Basin, one of the biggest continental petroliferous basins in eastern China, is a Mesozoic– Cenozoic fault-depressed and fault-subsided basin developed on the Hercynian fold basement. Generally, rearranged hopanes are considered to be formed by claymediated acidic catalysis under oxic or suboxic environment, whereas high abundance of rearranged hopanes were found in hydrocarbon source rocks and crude oils that are derived from salty environment in the Songliao Basin. This phenomenon rarely happens all over the world. This work analyzed hydrocarbon source rocks of the Songliao Basin to identify four different series of rearranged hopanes, and investigate their relationships with biomarkers and trace elements that can reflect the salinity and oxidation-reduction of sedimentary environment, in an effort to reveal the distribution and characteristics of rearranged hopanes from brackish water.