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<br />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].
Highlights
Structural changes of methylphenanthrene (MP) isomers in sediments are pretty well understood
For example, fourteen samples of biodegraded crude oils originating from Sakhalin Island (Russia) oil fields were recently classified, according to maturation degree based on maturity parameter MPI 3, into three groups [1]
Two novel parameters of crude oil maturation based on tricyclic aromatic fraction constituents are proposed: MPI 3 + 1/PAI 1 and [2(2-MP + 3-MP) + P]/1-MP
Summary
Structural changes of methylphenanthrene (MP) isomers in sediments are pretty well understood They were found to consist mainly of the transformation of α-isomers (1-MP and 9-MP) into thermodynamically more stable β-isomers (2-MP and 3-MP), as well as dealkylation of both α- and β-isomers yielding phenanthrene (P). Important maturation parameters based on crude oil tricyclic aromatic fraction constituents resulted from the investigation of these reactions [2,3]. 2002 al-Farabi Kazakh National University [9], MP-P maturation parameters are useful and important in correlation studies of biodegraded crude oils. Investigating the same fourteen samples of biodegraded oils, it was shown that the content of phenanthrene in the tricyclic aromatic fraction, [P], may be successfully used for the assessment of crude oil maturity. High maturity crude oils were suggested to contain more than 14% phenanthrene, crude oils of moderate maturity between 7 and 14%, and crude oils of low maturity less than 7% phenanthrene in the tricyclic aromatic fraction [1]
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