Structural Interpretation And Favorable Area Prediction Of The Fourth Member Of Permian Lower Wuerhe Formation In Yanbei 1 Well Block

3D seismic data of YB 1 wells region is located in the west of the Junggar Basin,which is located in the western part of the Luliang Uplift.The west is close to the Mahu sag and the north is close to the Yingxi sag.In the early exploration was based on structural reservoir.With the exploration into the middle and later,subtle reservoirs,like stratum and structure-lithology reservoir,have draw more and more attention in the region.So predicting favorable reservoir and hydrocarbon distribution in the study area become the focus of the next step exploration work.This thesis is based on 3D seismic data of YB 1 wells region.It has done fine tectonic interpretation for Baikouquan Formation of Triassic,Under-Wuerhe 4 Formation and Under-Wuerhe 3 Formation of Permian.On the basis of interpretation,it has done reservoir prediction of Under-Wuerhe 4 Formation,and structural traps and lithologic traps are evaluated.On the basis of the implementation of the various types of traps,this thesis proposes well deployment advice according to the area forming rules.Based on the analysis of fine structural interpretation,seismic attribute analysis and seismic inversion,this thesis forecasts the region Under-Wuerhe Formation sand stratum.Combined with seismic,geological and logging data,this thesis has a detailed evaluation for the target stratum reservoir characteristics.This thesis believes that:l)The Permian faults are well developed in this area and most of them are NW-SE strike compressive reverse faults.The size of fracture generally be small;2)This area has developed a lot of river channel sand-based,whose reservoir is thick.Its seismic group features are clear.As a result,it is easy to identify;3)This thesis recognizes the fault-lithology trap of YB 1 well Under-Wuerhe 4 Formation.The shape of trap is under the control of the faults and lithologic pinch-out.The faults that control the shape of trap are Lunan Fault and West MD 2 well 1 Fault.Lunan Fault is large reverse fault that controls the structure and is toward NE-SW.The disconnected horizons are from Carboniferous System to Triassic system.The target fault displacement is 5?15m and the extended length is 12.18kn;4)The trap is located in updip direction of Mahu hydrocarbon-generating sag.The structure position is favorable.This trap can form reservoir where oil-gas generates undermeath and stores above.Under-Wuerhe 4 Formation traps has a good relationship with the fracture.They can form more favorable conditions.This place can be the main objective of further exploration.The study uses geology,logging data,drilling data and seismic data.With the integrated use of attribute analysis and inversion techniques,the thesis predicts Under-Wuerhe 4 Formation channel sand reservoirs in 3D seismic data of YB 1 well.It sums up a viable river comprehensive prediction method of sand reservoir.It provides a reference for the next exploration well deployment and development.