Abstract Four rearranged hopane series were simultaneously detected in oils from the Muglad Basin, one of several rift basins on the Central African Shear Zone (CASZ). The series are identified as having the structure of 17α(H)-diahopane (D series), 18α(H)-neohopane (Ts series), early eluting rearranged hopane (E series) and 21-methyl-28-norhopanes (Nsp series). The four rearranged hopane series exhibit strong positive correlations. The slope and intercept of the linear equation in plots of C29D/C29H vs C30D/C30H are 1.10 and 0.003 respectively, possibly implying identical biological origins and formation mechanisms. The relatively low slope ( Δ G ) calculated by density functional theory (DFT), the thermodynamic stabilities of C30 isomers follow the order C30D > C30H > C30E.

中文翻译：

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原油中四种重排藿烷系列的鉴定、分布及地球化学意义

摘要 在中非剪切带 (CASZ) 上的几个裂谷盆地之一的穆格莱德盆地 (Muglad Basin) 的石油中同时检测到四个重排的藿烷系列。该系列被确定为具有 17α(H)-己二醇 (D 系列)、18α(H)-新藿烷 (Ts 系列)、早期洗脱重排的藿烷 (E 系列) 和 21-甲基-28-降藿烷 (Nsp 系列) 的结构）。四个重排的藿烷系列表现出很强的正相关。C29D/C29H 与 C30D/C30H 图中线性方程的斜率和截距分别为 1.10 和 0.003，可能意味着相同的生物起源和形成机制。通过密度泛函理论（DFT）计算的相对较低的斜率（ΔG），C30异构体的热力学稳定性遵循C30D>C30H>C30E的顺序。