streaming solvent cut -
direct fluorescence - прямая линейчатая флуоресценция? (словарь)
fluorescent cut -
natural cut -

Контекст:
Occasional, spotty, pale yellow to locally orange/yellow direct fluorescence was generally present down to XXXXm (cf: OWC at XXXXm (XXXX.3m TVDbrt) from wireline logs) with slow, dull white, streaming solvent cut. However, in the zone of poor to fair porosity between XXXX and XXXXm, occasional dark brown oil staining was present between grains and in vugs, giving spotty, pale yellow to orange/yellow direct fluorescence, instantaneous, bluish white fluorescent cut and faint, light brown natural cut.