ارزيابي مخزن بنگستان با نمودارهاي چاه و مدل سازي لرزه اي در ميدان نفتي اهواز

Reservoir quality evaluation utilizing wireline logs and seismic modeling for Bangestan group in Ahwaz field

Well logs and seismic sections provide main data for oil reservoir modeling. Generating synthetic seismogram is a method to calibrate these data. Characterization of Bangestan reservoir by well log analysis and seismic modeling was the goal of the present study. Bangestan is one of the Ahwaz Oil Field reservoirs. Ahwaz Field is located at the north side of Ahwaz city in the south of Iran. The major reservoirs in this field are Asmari, Bangestan and Khami Formations. In the first step of this study, several well logs (Neutron, Density, Sonic and Gamma ray) were digitized for more than fifty wells. These logs provided petrophysical information. Seismograms were generated by Geosyn software using sonic and density logs along the field on a seismic line. Petrophysical parameters calculated for this study using Excel software. Finally a synthetic seismic section was created and compared with petrophysical data such as porosity, volume of shale, lithology, etc. Interpretation of reflectorʹs behavior, study of the level of seismic parameters to capture geologic heterogeneities in synthetic seismograms, recognizing problems and prevents, analysis of the petrophysical parameters along the section and giving guidance for next studies on this reservoir constitute main results of this study. Porosity variation was recognized the most important factor in appearance of reflectors on the section and reflectors were shown that present zonation of Bangestan reservoir might be changed.