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Thermal modelling of petroleum source rocks in Prinos-Kavala basin

Kokaraki Ourania-Maria

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Year 2019
Type of Item Master Thesis
Bibliographic Citation Ourania-Maria Kokaraki, "Thermal modelling of petroleum source rocks in Prinos-Kavala basin", Master Thesis, School of Mineral Resources Engineering, Technical University of Crete, Chania, Greece, 2019
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Prinos-Kavala basin is the only geological area in Greece where oil and gas are being produced for more than twenty years. The geology and stratigraphy of this particular offshore area are well-known, because many geological and geophysical surveys and studies have been conducted due to the high interest for hydrocarbon exploration. Nowadays, a powerful tool for oil and gas companies in order to evaluate prospects and reducing investment risk in hydrocarbon exploration is basin modelling. Basin modelling is a forward simulation of geological history, hydrocarbon generation, expulsion, migration, and accumulation in a sedimentary basin applying a wide variety of data, such as well data, seismic sections, outcrops, etc.The objective of this thesis is to perform 1D basin modelling in three selected well locations within the Prinos-Kavala basin. The investigation centred upon the reconstruction of temperature and maturity histories of the examined well locations in order to address questions like if, when, where, and how much, and what type of hydrocarbons have been generated and expelled by the assigned source rocks in each well. Moreover, during this project, a sensitivity analysis was conducted in order to test the influence of some input data and boundary conditions as well as to assess the resultant effect on the simulated temperature and maturity histories.A lack of data imposed certain limitations on the produced 1D models resulting to a not completely representative modelling of the study area. However, a reasonable first estimation of past conditions and thermal and maturity histories was achieved. It was found that the assigned source rock formations of Pre-Prinos 3 and Pre-Prinos 1 have generated hydrocarbons in all well locations. Well K-1 seems to have the most mature source rocks with the highest present-day transformation ratio (55.60%) and is the only well in which the source rock has reached peak oil expulsion, which started at 0.44Ma.Sensitivity analysis results indicated that timing and duration of the erosional event between the Evaporitic and Post-Evaporitic sequences, the original thickness of eroded sediments, the paleo water depth boundary condition and the source rock characteristics (TOC and HI) do not affect the temperature and maturity histories. On the contrary, the heat flow boundary conditions plays an important role to the temperature and maturity modelling.

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