A model-based study of the filtering effects of thin-interbedded reservoirs on seismic reflection waves
The exploitation of thin-bedded and thin-interbedded hydrocarbon reservoirs has garnered increasing attention.However,seis-mic data of thin-bedded reservoirs exhibit low resolution,and conventional convolution models fail to simulate the complex wave field propagation phenomena in thin-bedded reservoirs,complicating the seismic prediction of such reservoirs.Hence,based on the transfer matrix method for layered media,this study developed a normal-incidence reflectance method.Using the new method,it conducted for-ward modeling on several typical thin-interbedded reservoir models.Then,the forward modeling results were analyzed through frequency spectrum analysis to explore the filtering effects of thin-interbedded reservoirs on seismic reflection waves.Compared to the transfer ma-trix method for layered media,the normal-incidence reflectance method is more applicable to the investigation of thin-interbedded reser-voirs under longitudinal wave incidence,significantly enhancing the forward modeling efficiency.Moreover,studying the reflection filte-ring effects of thin-interbedded reservoirs in the frequency domain somewhat eliminates the shortcomings of insufficient resolution in the time domain.The frequency spectrum analysis of thin-interbedded reservoir models shows that the normal-incidence reflectance method can effectively preserve the interbed information of thin-interbedded reservoirs.As revealed by the frequency spectrum analysis of the forward modeling results based on this method,the changes in the amplitudes and notch points of frequency spectrum curves can reflect the changes in the number of interbeds and sandstone-mudstone ratios in thin-interbedded reservoirs.This finding is critical for determi-ning the spatial distributions and properties of thin-bedded reservoirs in the fine-scale exploration of oilfields.
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