生物标志物苯并藿烷系列的新发现及其地化意义

蕾烷系列化合物的各类参数,已在石油地球化学研究中普遍应用,可有效地判断有机质类型及其成熟度。芳构藿烷发现有四芳和三芳藿烷,近年来又发现了一类新的单芳六环藿烷-苯并藿烷C₃2-C₃₅系列,它们分别检出于碳酸盐岩和原油（G.Hussler,1984）、磷酸盐和非磷酸盐沉积物（H.Belayouni,1984）、新疆准噶尔盆地侏罗系含煤地层埋深617.7-619.7米的黑色泥岩（盛国英、傅家谟,1985）、陕甘宁盆地侏罗系、上三叠统与石炭二叠系的碳质页岩和油页岩（黄汝昌、王广玉,未发表）中。笔者在酒西盆地下白垩统黑色泥岩中检出了C₃₂、C₃₃、C₃₅等苯并藿烷,更有意义的是,还首次鉴定出了C₃₁苯并藿烷,即C₂₉-降苯并藿烷,这进一步丰富了生物标志物的内容。

IDENTIFICATION OF A NOVEL SPECIES OF HEXACYLIC A ROMATIC HOPANOIDS AND DISCUSSION OF THEIR GEOCHEMICAL SIGNIFICANCE

Beazohopanoid series(C₃₁-C₃₅)have been studied and a new species-C₃₁ben- zohopane(CZB-norbenzohopane)was first identified in black mud-stones from 6 core samples in Jugi Basia(Lower Cretaceous Strata).They are particularly abun- dant in carbonaceous shales,which representative of acid medium in marsh enviro- meat, Though assumed to be formed in the early stage of diagenesis, from bacterial Cas hopanoid precusors, they might also be reserved in the later stage(up to the depth of 3700m).Two possible evolution mechnisms were proposed and the remark- able phenominon that the high concentration of benzohopanoids matches the low ra- do of Ts/Tm was observed, The ratio of C₃₁benzohopane/hopanes can be a new indicator of organic maturity,