Investigation into the factors influencing tar-mat formation in petroleum reservoirs.

摘要

The main aim of the present thesis is to investigate the processes and mechanisms leading to tar-mat formation in petroleum reservoirs. Fields being investigated are: The geochemistry of asphaltenes relating to tar-mat occurrence in petroleum reservoirs; nitrogen functionality distributions in asphaltenes isolated from several oils from different source rock types; characterization of asphaltenes by pyrolysis-field ionization mass spectrometry; relationships between normal and isoprenoid alkyl groups in asphaltenes and associated crude oil alkanes - indications from gas-chromotography isotope ratio mass spectrometry; on the origin of tar-mats in petroleum reservoirs - introduction and case-studies and formation mechanisms for tar-mats; recognition and quantification of the effects of primary migration in a Jurassic clastic source-rock from the Norwegian continental shelf; influence of bitumen-2 on Rock-Eval pyrolysis. 36 refs., 68 figs., 38 tabs.