| The study area is located on the Xingshugang structure in the tertiary tectonic belt in the middle of Daqing Placanticline,Songliao Basin.The target strata is F?-F? layers of Fuyu reservoir in the fourth member of Quantou Formation of early cretaceous.Nowadays,Daqing oilfield has entered the later stage of development,and Fuyu reservoir,as an important layer for Daqing oilfield to continue production,has now become a research focus for development.Therefore,the fine anatomy of the reservoir,the analysis of the distribution characteristics of single sand bodies and the study of reservoir heterogeneity is of great significance.Based on logging data and oilfield history,using the "closed skeleton profile control contrast technology",the single sand body isochronous stratigraphic framework of Fuyu reservoir is established.Under the control of isochronous stratigraphic framework to analyze the sedimentary background,it is clear that 2 subfacies and 13 microfacies are developed in the study area.The logging characteristics are analyzed and the corresponding logging phase model is established.On this basis,the sedimentary characteristics of each unit and the distribution of sedimentary microfacies are described to analyze the sedimentary evolution law of the study area.Based on the above results,the reservoir heterogeneity of F?-F? layer was studied.By analyzing the characteristics of permeability parameters and the distribution of interlayers in the layer,the heterogeneity in the layer is studied;Through the comparison of interlayer parameter differences,clarify the distribution characteristics of the interlayer and affect the study of interlayer heterogeneity;By analyzing the sedimentary facies to study the plane heterogeneity,we can get the distribution law of the sand body plane distribution.The research shows that the F?11-F?24 layers are delta front subfacies;the F?31-F?23 layers are delta plain subfacies.Through the calculation of the permeability heterogeneity coefficient in the layer and the analysis of the distribution characteristics of the interlayer in the layer,it is concluded that the FI71-FI73 layer is relatively homogeneous;FI31-FI63 and FII11-FII23 are belong to medium heterogeneity;F?11-F?24 layers are strongly heterogeneous;By studying the characteristics of layering coefficient,sandstone density and barriers,it is known that the interlayer heterogeneity of the F?71,F?72 and F?11 layers is weak,the interlayer heterogeneity of F?11 layer,FI12 layer,FI33 layer,FI41 layer,FI42 layer and FII12 layer is strong;Through the analysis of the sand body geometry,size and physical property distribution characteristics on the analysis plane,it is concluded that the planes F?11-F?24 have strong heterogeneity,among which the planes F?22 andF?23 have the strongest heterogeneity;the F?31-F?63 layers and F?11-F?23 layers are moderate heterogeneity;F?71-F?73 layers are the weakest.Comprehensive analysis of intra-layer,inter-layer,and plane heterogeneity shows that sedimentary characteristics are the main controlling factors for reservoir heterogeneity.On the plane,the sedimentary microfacies control the geometry and physical properties of the sand body;In the vertical direction,changes in sedimentary microfacies lead to changes in porosity and permeability between sand layers,and the interlayer formed by deposition is also an important factor in the evaluation of reservoir heterogeneity.Through the above research,the analysis of sedimentary microfacies and reservoir heterogeneity of F?-F? layers in Xingbei X area is completed. |
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