Abstract3D basin modelling of a study area in Quadrant 30, UK North Sea was performed in order to elucidate the burial, thermal, pressure and hydrocarbon generation, migration and accumulation history in the Jurassic and Triassic high-pressure high-temperature sequences.Calibration data, including reservoir temperatures, pressures, petroleum compositional data, vitrinite reflectance profiles and published fluid inclusion data were used to constrain model predictions. The comparison of different pressure generating processes indicated that only when gas generation is taken into account as a pressure generating mechanism, both the predicted present day as well as palaeo-pressure evolution matches the available calibration data. Compositional modelling of hydrocarbon generation, migration and accumulation also reproduced present and palaeo bulk fluid properties such as the reservoir fluid gas to oil ratios. The reconstruction of the filling histories of both reservoirs indicates that both were first charged around 100 Ma ago and contained initially a two phase system in which gas dominated volumetrically. Upon burial reservoir fluid composition evolved to higher GORs and became undersaturated as a function of increasing pore pressure up to the present day situation. Our results indicate that gas compositions must be taken into account when calculating the volumetric effect of gas generation on overpressure.2
As part of the Australian Government’s Energy Security Initiative, a new tectono-stratigraphic and petroleum
systems study has been carried out in the Vlaming Sub-basin on Australia’s southwest continental margin. The study has included: biostratigraphic revisions for key wells; seismic interpretations of new and reprocessed data; geochemical assessments of key source rock intervals and liquid hydrocarbons; structural restoration of key seismic sections; and, 3D burial history modelling. Results have significantly improved our understanding of the Vlaming Sub-basin’s evolution and provide a basis for future exploration. New exploration opportunities in the southern Vlaming Sub-basin are open to explorers through the Australian Government’s 2008 Acreage Release.
Absolute Lichtausbezcten, Anregungsfunnlctdonem und IntensitbtsverhUltn(sse im He-, Ne-und Ar-Spektrum 6ei Anregung durch Atomstop d r n Geschwindigke2tsberdch von 0 bis 4500 Volt l)Von Vollcmar N e w m a f i n (Mit 11 Abbildungen) .
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