CJ? Liquid fuels firanspot ?, refining, quality, storage) correspondence between the decrease in interfacial tension as a function of pH and the acid number of the original crude oils. Generally, low contact angles were observed at high and low pH values, whereas angles up to 47" were observed in the intermediate pH range. The contact angles did not show a direct correspondence with the acid numbers but gave the same trend as the corresponding whole crude oils (presented in a previous work). Observations from both interfacial tension and contact angle experiments emphasize the importance of acid structures, or acid types, present in the fractions compared to the acid concentrations. Acid characterization by gas chromatography with a mass sensitive detector (GC-MS) showed significant differences in the molecular structures for the acids dominating each of the three fractions. Fractions enriched in alkyl acids, phenols and cyclic acids were found to have impact on the wetting properties of the silicate surface, whereas fractions enriched in more complicated aromatic ring structures with high degree of carboxylic compounds did not affect the contact angle. FT-IR spectra of the acid extracts confirmed the results from the GC-MS analysis and showed correspondence to the acid numbers of the three crude oils.
in the Triassic and Late Jurassic. Coastal processes improved the reservoir quality of Upper Triassic ta Middle Jurassic sands during regressive periods. One exploration well within the basin and three wells surrounding the basin have produced oil shows, but no commercial discoveries have been made so far. During the review period of the present paper, an exploration well encountered oil and gas in Triassic sandstones in the southwestern segment of the basin. This is the first direct indication of a mature, oil-producing source rock in the Nordkapp Basin and will be important for future exploration of the basin.
02/02356
Source rock analysis and etroleum IIt eochemistry of the Trym discovery, R orwegian North Sea: a iddle Jurassic coal-sourced petroleum system