Phenanthrene and Methylphenanthrene Isomers in Maturity

Assessment of Biodegraded Crude Oils (Sakhalin, Russia)

Ksenija Stojanović1,2, Branimir Jovančićević1,3, Anatoly Golovko4, Julia Golovko4,

Galina Pevneva4, Olga Cvetković3 and Dragomir Vitorović1,3

1Department of Chemistry, University of Belgrade, P.O. Box 158, 11001 Belgrade, Yugoslavia

2Department of Medicine, University of Belgrade, Viљegradska 26, 11000 Belgrade, Yugoslavia

3Center of Chemistry, IChTM, Njegoљeva 12, 11000 Belgrade, Yugoslavia

4Institute of Petroleum Chemistry, 3 Academichesky Ave., 634021 Tomsk, Russia

Abstract

This paper is aimed at defining two new advantageous maturation parameters based on distribution and abundance of phenanthrene (P) and methylphenanthrene (MP) isomers in the tricyclic fraction of aromatic hydrocarbons: MPI 3+1/PAI 1 and [2(2-MP+3-MP)+P]/1-MP. The applicability of newly proposed parameters was checked by correlation analysis. Depth of the reservoir rock, diasterane maturation parameter, as well as several typical aromatic fraction maturation parameters were used for this purpose. The examined oils (fourteen samples from nine oil fields of Sakhalin Island, Russia), were of Miocene age and from reservoir rocks of relatively wide range of depths (73-2841 m). All samples represented biodegraded, or mixtures of biodegraded and nonbiodegraded oils [1].