晋县凹陷赵7井原油中异常高丰度地芰烷化合物的检出及其稳定碳同位素组成

Occurrences and Distributions of Stable Carbon Isotopic Compositions of High Abundant Diginanes and Homodiginanes in the Crude Oil of Well Zhao7 in the Jinxian Sag,China

晋县凹陷赵7井原油中检出了异常高丰度的、具有5α,14β,17β(H)-立体构型(αββ-)的短链甾烷——地芰烷和甲基地芰烷。沉积环境是高丰富地芰烷和甲基地芰烷出现的重要影响因素。Requejo等报道的具有5β,14β,17α(H)立体构型(ββα-)的短链重排孕甾烷和重排升孕甾烷的出现,代表了过剩铁的沉积环境,研究区高丰度地芰烷和甲基地芰烷的出现,则代表了贫铁、硫过剩的沉积环境。

High abundant diginanes and homodiginanes with 5 α, 14β,17β（H） -stereochemistry （αββ-） were detected in the crude oil （2 280 m,Ek） of Well Zhao7 from the Jinxian Sag, Bohao Bay Basin, China. The specific, characterized depositional environment with high abundant sulfur and sulfate minerals play an important role in the occurrence of high abundant diginanes and homodiginanes. High abundant short-chain diapregnanes and diahomopregnanes with 5β, 14β, 17α （H） （ββa-） stereochemistry which reported by Requejo et al. （1997）, generally occurred in the depositional environment with enough iron minerals. On the contrary, high abundant diginanes and homodiginanes occurred in this study which indicates an environment with enough sulfur.