Benzo[b]naphthothiophenes and alkyl dibenzothiophenes: molecular tracers for oil migration distances

Marine and Petroleum Geology
By: , and 

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Abstract

The secondary migration of petroleum is one of the most critical geological processes responsible for the accumulation of hydrocarbons in a sedimentary basin. Pyrrolic nitrogen compounds such as carbazoles and benzocarbazoles are thought to be practical molecular indicators for estimating relative migration distances of oil. In light oils or condensates, however, considerable analytical errors are usually caused by low concentrations of NSO-compounds. Here we show that polycyclic sulfur aromatic hydrocarbons such as dibenzothiophene, C1∼C3 alkylated dibenzothiophenes and benzo[b]naphthothiophenes, which are present in relatively higher concentrations than the pyrrolic nitrogen compounds, exhibit changes in both absolute and relative concentrations that correlate with migration distances. The polycyclic sulfur aromatic hydrocarbons related parameters — benzo[b]naphtho[2,1-d]thiophene/{benzo[b]naphtho[2,1-d]thiophene + benzo[b]naphtho[1,2-d]thiophene} (abbreviated as [2,1]BNT/([2,1]BNT+[1,2]BNT) and the concentration of total dibenzothiophenes plus benzo[b]naphthothiophenes — are proposed by this paper to trace the oil migration distances.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Benzo[b]naphthothiophenes and alkyl dibenzothiophenes: molecular tracers for oil migration distances
Series title Marine and Petroleum Geology
DOI 10.1016/j.marpetgeo.2014.06.012
Volume 57
Year Published 2014
Language English
Publisher Elsevier
Contributing office(s) Central Energy Resources Science Center
Description 15 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Marine and Petroleum Geology
First page 403
Last page 417
Country China
Other Geospatial Tarim Basin;Tahe Oil Field