Organic geochemistry of Jurassic-Cretaceous source rocks and oil seeps from the profile across the Adriatic-Dinaric carbonate platform

Details

Serval ID
serval:BIB_E554527F970A
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Organic geochemistry of Jurassic-Cretaceous source rocks and oil seeps from the profile across the Adriatic-Dinaric carbonate platform
Journal
Geologica Carpathica
Author(s)
Fiket Z., Alajbeg A., Strmic Palinkas S., Tari-Kovacic V., Palinkas L.A., Spangenberg J.E.
ISSN-L
1335-0552
Publication state
Published
Issued date
2008
Peer-reviewed
Oui
Volume
59
Pages
225-236
Language
english
Abstract
Organic geochemical and stable isotope investigations were performed to
provide an insight into the depositional environments, origin and
maturity of the organic matter in Jurassic and Cretaceous formations of
the External Dinarides. A correlation is made among various parameters
acquired from Rock-Eval, gas chromatography-mass spectrometry data and
isotope analysis of carbonates and kerogen. Three groups of samples were
analysed. The first group includes source rocks derived from Lower
Jurassic limestone and Upper Jurassic ``Leme'' beds, the second from
Upper Cretaceous carbonates, while the third group comprises oil seeps
genetically connected with Upper Cretaceous source rocks. The carbon and
oxygen isotopic ratios of all the carbonates display marine isotopic
composition. Rock-Eval data and maturity parameter values derived from
biomarkers define the organic matter of the Upper Cretaceous carbonates
as Type I-S and Type II-S kerogen at the low stage of maturity up to
entering the oil-generating window. Lower and Upper Jurassic source
rocks contain early mature Type III mixed with Type IV organic matter.
All Jurassic and Cretaceous potential source rock extracts show
similarity in triterpane and sterane distribution. The hopane and
sterane distribution pattern of the studied oil seeps correspond to
those from Cretaceous source rocks. The difference between Cretaceous
oil seeps and potential source rock extracts was found in the intensity
and distribution of n-alkanes, as well as in the abundance of
asphaltenes which is connected to their biodegradation stage. In the
Jurassic and Cretaceous potential source rock samples a mixture of
aromatic hydrocarbons with their alkyl derivatives were indicated,
whereas in the oil seep samples extracts only asphaltenes were observed.
Create date
26/09/2012 18:11
Last modification date
20/08/2019 16:08
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