Abstract:Fuyu oil bearing beds,as tight hydrocarbon reservoirs with low-porosity and ultra-low-permeability,are widely developed in the peripheral of Daqing,Songliao Basin.Channel sandbodies there are characterized by a narrow,thin,and poor distribution.It is very difficult to depict this kind of sandbodies only on the current sparse well patterns.Therefore,seismic principal components (PCA) and Fisher discriminant analysis are used for Fuyu reservoirs' research in the Block Fang 38.The following observations are obtained:①The PCA analysis is used for the dimension-reduction optimization of seismic attributes.The three-principal-component information at borehole accounts for 95.5% of the total variance of the original data.So the dimension of seismic attributes is reduced and the redundant information in multiple attributes is eliminated; ②The Fisher discriminant theory of multiple statistics is applied to the analysis of narrow channel sandbodies.Based on sandstone thickness at boreholes and the three-principal components at boreholes,Fisher sand and shale discriminant model is established,which not only integrates well-point sandstone thickness but also takes into account the spatial distance influence of seismic data.So the channel sandbody prediction is improved;③With sandstone thickness of 1.5,2,and 3 m,the accuracy rates of Fisher sand and shale discriminant model are 87.5%,88.9%,and 90%.And the ability to discriminate channel sandbody is even stronger.
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