Characterization of the Qishn sandstone reservoir, Masila Basin–Yemen, using an integrated petrophysical and seismic structural approach

摘要: Abstract This study presents an integrated petrophysical and seismic structural analysis that is carried out to evaluate the reservoir properties of Qishn sandstone as well entrapment style hydrocarbons at Sharyoof field, Sayun-Masila Basin located east central Yemen. The rocks are dominated by clean porous permeable sandstones zones usually intercalated with some clay stone interbeds. As identified from logs, classified into subunits (S1A, S1B, S1C S2) different characteristics hydrocarbon potentiality. A number qualitative quantitative logging analyses used characterize identify its Dia-porosity, M-N, Pickett, Buckles plots, analogs lateral distribution maps in analysis. Shale volume, lithology, porosity, fluid saturation among most important deduced parameters. revealed S1A main hydrocarbon-bearing units. More specifically, unit best, it attains prolific saturations (oil “SH″ up 65) characteristics. An average ranges 4–21%, 16–23%, 11–19%, 0–65%, detected for unit, regarding shale total effective saturation, respectively. Meanwhile, S1B exhibits less (Vsh>30%, ϕEff (for units) indicated middle area NE–SW oriented closures. interpretation data had clarified structure represented a big horst bounded group step-like normal faults extreme boundaries (faulted anticlinal-structure). In conclusion, encountered oil seems be due combined effect stratigraphic position clastics their overlying thick-sealing sediments setting faulted anticlinal-structure associated bounding faults.