Seismic Fine Interpretation And Reservoir Prediction Of Fuyu Oil Layer In Block B Of Pubei Oilfield

The characteristics of Block B,in Pubei reservoir,with lateral stratum changes fast,strong heterogeneity,complex structure,and the thickness of reservoir sand body is thin.In this paper,,putting forward the new method of fine structure interpretation in the process of fine seismic interpretation and reservoir prediction.Meanwhile,applying a new inversion method,combination of seismic,geological and logging data of geostatistics,to forecast the reservoir Fuyu.Deepening the understanding of the reservoir distribution,and giving suggestions for further well location evaluation.Firstly,the coherence cube combined with spectral decomposition technology is innovatively used to explain the structure and fault characteristics of the study area in detail.The top surface of fuyu oil reservoir shows an asymmetric anticline trap in the north to the west.The overall structural trend is:south height?-1255m?,north low?-1500m?,east high?-1400m?,west low?-2000m?.Top faults are developed,all of which are normal faults,and the fault trends are mainly NNW and NW.The fault distance is generally 20⁶0m,the inclination angle is 50°⁷0°,and the extension length is 0.5⁶.0km.Explain the local trap area of 45.05 km²/132 F?layer;F?layer 44.47 km²/115;40.92 km²/112 F?layer,local trap types is given priority to with block,fault nose and fault anticline.Secondly,based on the seismic,geological and well logging data,the wave impedance data,resistivity data and gamma data are obtained by using the relatively new geostatistics inversion method.The results show that the transverse F?oil group sand body changes quickly,sandstone thickness is up to 13 m,effective sandstone thickness is up to 6.5 m.F?oil group mainly vertical accretion of sedimentary sand body is given priority to,in the work area of the Midwest is development,sandstone thickness can be up to15 m,effective sandstone thickness can be up to 10 m.F?oil group set of the southwest and northeast development,up to 5 m sandstone thickness,effective sandstone thickness can be up to 4 m.Finally,through the analysis of lithological model and property model,it is determined that the physical porosity of fuyu reservoir is generally 4.0%¹5.0%,and the permeability is generally0.05⁷.00×10^-3?m²,which belongs to medium and low porosity and low permeability reservoirs.Eight favorable drilling targets were selected by comprehensive utilization of research results on deposition,reservoir,structure,inversion,logging interpretation and seismic properties.