Investigation of the molecular and isotopic response to deposition, thermal maturity, hydrocarbon generation, and expulsion : A multidisciplinary approach based on the Cenozoic sequences on Svalbard

• Published in: Geological Society, London, Special Publications
• Main Author: Dörner, Markus
• Other Authors: orcid:0000-0002-9236-1836
• Format: Doctoral or Postdoctoral Thesis
• Language: English
• Published: The University of Bergen 2020
• Subjects: Frysjaodden; Svalbard
• Online Access: https://hdl.handle.net/1956/22229

Understanding the generation, expulsion and migration of hydrocarbons and the associated effects on the molecular composition of generated products plays a major role in petroleum system analyses. The presented PhD study is based on a research well from the Central Tertiary Basin of Svalbard which has not been investigated in detail previously. The core material from this well is of exceptional quality. A comprehensive depositional reconstruction of the lithologies of the research well has been established by combining inorganic and organic geochemistry. Shedding a light on the effects of sulphate reduction on the preserved organic matter quality supported a better understanding of the depositional settings and natural quality limitations on the present-day organic matter concentration. The effects of thermal maturity on the organic matter and on selected biomarker compounds as well as on molecular maturity proxies has been investigated. The implementation of multivariate statistics has led to the creation of a novel unitless biomarker maturity trend. Molecular fractionation effects associated with the expulsion and migration of hydrocarbons have been investigated. The findings show that polar compounds and asphaltenes were preferentially retained in the organic rich layers of the lower Frysjaodden Fm. On the other hand, the expelled hydrocarbons have migrated upwards and mainly consist of saturated compounds of low polarity. The development of an advanced maturity-based back calculation approach made it possible to calculate the amounts of hydrocarbons that have been generated, expelled and migrated with respect to their initial organic matter quality and quantity. In addition to the geoscientific investigations, two analytical methodologies have been developed in the course of this PhD project. The first methodology involves the multiple detector coupling to a single gas chromatograph in order to enhance the data density per injection and significantly reduce the sample preparation work for organic geochemical ...