Research Of Reservoir Prediction Based Upon Petrophysics Parameter Forward Modeling

With the gradual development of exploration technology,the direction of exploration has also changed,the exploration goal from the traditional looking for structural oil and gas reservoirs gradually shift to find lithologic reservoirs. While the prediction of lithologic oil and gas reservoirs has paid great attention to the quality of underground elastic parameters. In this thesis, we study the K area of lithologic stratigraphic oil and gas reservoirs with complex geologic structure and low seismic data,and formulate a set of research program suitable for the area.Different reservoir prediction methods are adopted for different geological conditions and data quality. In the K study area, the tectonic deformation is weak, the type and quantity of the structural traps are small and the amplitude is low, and the reservoir reflection is weak, the seismic resolution is low,the over-point is difficult to be identified. If the prestack is used,the quality of the seismic data did not meet the requirements. Therefore, this paper studies the reservoir prediction method based on post - stack inversion.According to the characteristics of the study block, the petrophysical parameter forward modeling, the seismic post-stack inversion technique and the seismic attribute analysis technique are used synthetically. Well logging is closely related to petrophysical analysis and reservoir inversion, and the characteristics of logging and the geophysical laws reflected can be demonstrated by systematic analysis of petrophysics. On the one hand, through the rock physical parameters of the forward technology can correct the well information of the defect information, through the calculation, reconstruction of the perfect longitudinal, shear wave velocity and density and other information, a greater degree of effective use of workplace wells, Provide sufficient research data for subsequent reservoir prediction. On the other hand,using the fluid replacement technique, we can study the geophysical response characteristics in different fluid medium environments. At the same time, through the analysis of the sensitivity of petrophysical parameters, the parameters of sand and shale are identified and compared, and the direction of subsequent reservoir inversion is pointed out.In this thesis, the post-stack inversion method based on petrophysical analysis is used to describe the spatial distribution and distribution characteristics of favorable reservoirs in the study area,and the planar distribution characteristics of thin reservoirs in the study area .Combining the analysis and extraction of various seismic attributes to constrain the uncertainties of reservoir prediction results , To form a set of suitable for the depth of the buried, the thickness of the reservoir, the upper part of the existence of the shield area of favorable reservoir prediction techniques and methods.