Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744759
Title: An organic geochemical study of the Jordanian Eocene Marl oil-shales
Author: Al-Alaween, Mohammad
ISNI:       0000 0004 7229 0166
Awarding Body: University of Newcastle upon Tyne
Current Institution: University of Newcastle upon Tyne
Date of Award: 2015
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Abstract:
Unconventional natural energy resources, such as oil shales, constitute significant petroleum exploration opportunities. One promising example, which was deposited in an extended shelf environment of the Campanian-Eocene southern Neo-Tethyan margin, is the organic-rich marlstone in Jordan. In this study, new high-resolution depth profiles of bulk and molecular geochemical proxies are presented, collected from three cores drilled in central Jordan. Despite pronounced fluctuations in total organic carbon (TOC) (min. 0.4, max. 36.8, av. 11.0 %) and total sulphur (TS) (min. 0.1, max. 8.7, av. 2.7 %), Hydrogen Index (HI) values between 500 and 900 (mg HC/g TOC), along with high abundances and variability of sulphur bearing organic compounds, indicate preservation of type IIS kerogen. Molecular maturity marker derived indices from both the saturate and aromatic fractions were interpreted' with the aid of multivariate statistics (PCA). The results suggest thermal maturity levels spanning from immature to the kerogen type IIS early oil window and good to excellent source rock potential, consistent with TOC/S relationships, Tmax, the amount and composition of bitumen, and petrographic observations. The hydrocarbon (HC) compound class (e.g. n-alkanes, isoprenoids, steranes, hopanes) distributions support a primary marine source of the organic matter (OM) with some minor but variable contributions from terrestrial OM precursors. Consistent with marine OM source, the petrographic observations suggest OM to have largely undergone intense bacterial reworking, resulting in amorphous OM (AOM) and rarely primary OM remnants. The presence of specific biomarkers for photic zone euxinia, bottom water anoxia, and water column stratification, including isorenieratane, lycopane, and gammacerane, confirm a strongly reducing and at times even euxinic depositional environment with intermittent more oxygenated periods. These overall extreme redox conditions, which developed within a shallow rather proximal shelf system, significantly enhanced the preservation potential of hydrogen-rich OM and, in the absence of a significant supply of reactive Fe, favoured the incorporation of sulphur into the OM.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.744759  DOI: Not available
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