Research On Favorable Sandbody Prediction Of Surennuoer Oilfield

The northern area of Wuerxun sag in Hailar Basin has complex tectonic background,sedimentary filling effect changes quickly and reservoir changes quickly on the transverse,which restrict the effective exploration of non-producing reserves together.Therefore,on the basis of comprehensive analysis of core,drilling,logging and 3D seismic data and the establishment of high resolution sequence stratigraphy framework,this study analysis the sedimentary facies features and the evolution of depositional systems of oil groupes,which predict the spatial distribution characteristics of sand body qualitatively;at the same time,this study uses geostatistics stochastic simulation inversion method combined with sparse pulse wave impedance inversion to simulate the reconstructed log curve of target intervals,which predict the spatial distribution characteristics of sand body quantitatively.Based on the drilling,logging and 3D seismic data,under the guidance of high resolution sequence stratigraphic theory,Nantun Formation and Damoguaihe Formation have been divided into three third-order sequences and seven oil groupes and the sedimentary characteristics has been studied by cores observation,detailed interpretation of logging and seismic data.The results showed that the northern area of Wuerxun sag mainly develops four types of sedimentary facies: fan delta,braided river delta,sublacustrine fan and lacustrine facies.The fan delta mainly develops in the steep slope zone,the braided river delta mainly develops in the gentle slope zone and the sublacustrine fan develops in the deep lake environment front of the fan delta.At the same time,based on the research of oiliness and physical properties of sedimentary microfacies,the braided river channel in sublacustrine fan and the distributary channel in delta front are the most favorable facies zones,the next is the mouth bars in delta front and turbidity sand in sublacustrine fan and the third rank is given to sheet sand in delta front.On the basis of standardization of well logging curve and analysis of curve sensitivity,this study adopts reconstructed log curve sensitive to lithology as the parameters of the inversion.Geostatistics stochastic simulation inversion method combined with sparse pulse wave impedance inversion has characteristics of high vertical resolution and high lateral resolution and the effect of reservoir prediction is good.The seismic inversion elaborates the spatial distribution characteristics of sand body.The results showed that the coincidence rate between inversion profile and well is high.