Geological Modeling And Application Based On Petrophysical Classification

Baima middle area’s Chang8 reservoir in Xifeng oil field is a typical tight sandstone reservoir.Pore structure is complex,and vertical heterogeneity is very serious,single well production is low and production of single well declines quickly.Aimed at these existing problems,research of petrophysical facies is established on the basement of geology and development data.Based on the study of the diagenetic facies of the Chang 8 tight sandstone reservoir in the study area,the reservoirs with different pore structures were classified by the multi-parameter analysis method combined with the pore-permeability,nuclear magnetic and capillary pressure curves.Four types of petrophysical,The correspondence between the various phases and the characteristics of the logging curve is established,and the results are applied to the single well.The geological model considering the petrophysical facies is established by using the sequential indication simulation in stochastic modeling.It is found that the physical model of rock can distinguish the barrier layer and the blocking layer by comparison with the conventional lithologic model.Finally,the numerical results of reservoir A,B and C are predicted by numerical simulation of reservoirs.At the end of 30 years,the production efficiency of Class A reservoir is high while type C’s is low.The development of the program improved the flooding of Class A reservoirs and improved the recovery of Class B and C reservoirs,and increased the overall recovery from 19.3% to 19.2%,thus increasing the recovery of the study area rate.The results of the study can provide some guidance for the production of the work area.