Abstract: With respect to Wuerhe formation reservoir (Upper Permian), south District No.5 in northwest margin of Junggar basin, the reservoir description has been made with 2~D seismic data.Based on the reservoir framework description, 26 high-quality 2-D seismic profiles which travel through more holes have been selected in work area, the fine interpretation has been made on CHARISMA (Schlumberger Co.) and INTEGRAL (CGG Co.) exploration workstations.The data of seismic, logging, drill stem testing, and lab analysis were wholly used to undergo the structure and sedimentology description, lateral tracing of oil and gas bed, backward modelling of absolute wave impedance and porosity profiles, and studies in change of porosity in plane.Gas/oil contact and oil/water contact were determined by using varied information of seismic event and absolute wave impedance profile.The agreement between the above results and drilling results suggest that the fine reservoir description with 2 D seismic data in northwest margin of Junggar basin is feasible.

Key words: Karamay oilfield, South District No.5 reservoir, 2-D seismic profile, Reservoir description