Novel saturated hexacyclic C34 and C35 hopanes in lacustrine oils and source rocks

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Abstrakt

Novel C34 and C35 hexacyclic hopanes having side chains with a pentacyclic or hexacyclic ring at C-22 are abundant in lacustrine oils and source rocks but almost absent from marine oils. The corresponding C34 and C35 hexacyclic hop-17(21)-enes were identified in thermally immature mudstones from Vietnam cored in the 500m deep ENRECA-3 well. All the novel hexacyclic compounds were unambiguously identified by comparison with synthetic standards. Traces of heptacyclic hopanes were detected in a lacustrine oil from Thailand. The C34 and C 35 hexacyclic hopanes have much longer gas chromatography (GC) retention times than the corresponding pentacyclic hopanes. They are isomerized faster at C-22 than the pentacyclic hopanes and their 22S/(22S+22R) ratio values at equilibrium are much higher (0.8 for C34). Precursors could be penta- and hexafunctionalised hopanoids in cyanobacteria and methanotrophs.

OriginalsprogEngelsk
Sider (fra-til)107-118
Antal sider12
TidsskriftOrganic Geochemistry
Vol/bind87
DOI
StatusUdgivet - 1 okt. 2015

Programområde

  • Programområde 3: Energiressourcer

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