Based on the data of 30 biomarker indices of 39 crude oil samples and 29 source rock samples collected in the Jiyang Depression

Huabei Basin

the author screened these indices by generalized correspondence analysis. It is suggested that the 5α-C

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Sterane ββ/(αα+ββ) and 5α-C

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Sterane 20S/(20R+20S)are the main indices of crude oil maturity

while the relative abundance of rearranged Sterane

4-methylsterane and Tm/Ts are of secondary importance.