The Prediction Of Thin Reservoirs Of Beach Bar In The ShuShanhe Formation Of Cretaceous In The YingMaili Area,in The Northern Tarim Basin

The detrital rocks of ShuShanhe formation in YingMaili Area have good oil and gas indication and great exploration potential.The present study shows that sandstone body of ShuShanhe Formation is deeply buried,sandstone body thickness is relatively thin,transverse distribution range is not explicit,the amount of drilling wells is small,and three-dimensional seismic research area coverage frequency is low,which have increased the difficulty of reservoir prediction in this area.In this paper,by utilizing seismic stratigraphy and seismic reservoir sedimentology theory as the instruction,proceeding seismic forward modeling analysis of geological model,and combining seismic waveform inversion and strata slice technology,forecasting the favorable sandstone body distribution qualitatively and quantitatively.Firstly,the sequence framework of seismic layer is determined by well seismic calibration.Then based on the actual drilling and logging data,the objective interval could be divided into five different types of lithology combination,establishing the model of one-dimensional forward seismic attributions on the basis of geological model and then summarizes three different lithology combination of seismic wave reflection mode;further using the Waveform indicator inversion method(SMI)with characteristics of phase-controlled and well-diluted to indicate waveform inversion of research area of 2256.25 krrm2,the inversion effect is validated by drilling and well logging,obtains high inosculation,which could be used to carry out the thin sandstone body prediction;finally predicting the sandstone body distribution through model qualitatively,combining with the slice of inversion attribute to predict sandstone body thickness and five huge favorable finger-distributed sandstone body is predicted comprehensively in YingMaili objective interval,and two suggested well locations are proposed.This study has obtained a good exploratory result in the method of thin sandstone body seismic prediction,which can provide a reference for oilfield exploration and deployment.