Comprehensive Evaluation Of Chang 6 Reservoir In 38 Area Of Wuqi Oil Field

38 Area of Wuqi Oil field is located in the central and southern part of Shaanbei slope —the secondary structural unit of Ordos basin.This paper mainly studies Chang 6 reservoir,because the geological conditions in this oil region are complicated,the oil layer is high,the lateral and vertical heterogeneity are strong and the reservoir is large in scale.Therefore,This paper conducts comprehensive evaluation to Chang 6 reservoir,and providing the basis for the further development plan.This oil region is located in the delta sedimentary environment,which belongs to the delta front subfacies sedimentary,they are underwater distributary channel,river channel flank and divergent bay microfacies,the underwater distributary channel is the main sedimentary environment of sand body in the oil region.The lithology of Chang 6 reservoir is mainly light gray,gray green,gray mesograin and fine feldspar sandstone.The diagenesis types mainly include the compaction,pressolution and cementation.The types of porosity are dominated by intergranular pore and dissolution pore.The average porosity of the chang 6 reservoir is 10.0%,and the average permeability is 0.54×10-3μm2.The interlayer heterogeneity of reservoir shows strong,The interlaminar and plane heterogeneity of reservoir show ordinary.Based on the reservoir characteristic,permeability,porosity,sand body thickness,displacement pressure,median radius,sedimentary microfacies and lithology are selected as reservoir evaluation parameters,and the reservoir was divided into three types,the typical wells of three categories were analyzed.In summary,the chang 61 and chang 62 reservoir are chosen as the implementation layer for the further development plan,because there are abundant type I and type II reservoir.