Study on key techniques for identifying sand bodies in high-precision 3D seismic exploration of sandstone-type uranium deposit:An example from the HLJ region in Songliao basin
After intensive survey work for sandstone-type uranium deposits,it is necessary to finely characterize target sand body and determine the connectivity of sand body in exploration stage.In this paper,the key techniques were explored and formed for sand body identification based on high-precision 3D seismic data of HLJ region based on the feature of sandstone type uranium deposits of sandstone and mudstone interbedded,poor continuity,and small scale sand body.Firstly,high-resolution processing techniques including prestack noise suppression,combined deconvolution,and prestack time migration were applied to improve signal to noise ratio and resolution of data.Then,sensitive parameters of lithology were determined through rock physics analysis of logging data.Finally,multi-parameter lithology inversion was applied to effectively identify target sand body based on the sensitive lithologic parameters resistivity.The steps of processing and interpretation constitutes the key techniques for sand body identification.The practical application effect proved that established techniques was effective and feasible to identify the thin interbeded sandstone and mudstone in case of the acoustic impedance overlay of sandstone and mudstone,which are quite prospective in future application.
high-precision 3D seismic explorationsandstone-type uranium depositsand body identificationhigh-resolution processing with high fidelity and amplitude preservationmulti-parameter lithology inversion
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