Application of waveform indication inversion based on compressive sensing in thin reservoir prediction
The effective sand body of Lower Shihezi Formation of Permian in Daniudi gas field in the eastern margin of Ordos Basin is tight,small in scale,thin in thickness,has strong reservoir heterogeneity and is severely overlapped in seismic wave impedance.In order to effectively describe the tight thin sandstone reservoir of Lower Shihezi Formation with 5-6 m,the main single sand body of Hel Member gas reservoir is selected as the research object.On the basis of seismic forward analysis,a technical combination of pre-stack gather data optimization and quality improvement+compressive sensing extension frequency+P-wave calibration+waveform indication GR inversion is formed.This technology combination organically combines the advantages of compressive sensing technology and waveform indication inversion technology,and is applied in the main single sand body of He1 Member gas reservoir.The prediction results show that the transverse and longitudinal resolution of the seismic profile is improved significantly,and the prediction results are more consistent with the geological sedimentary law,and are in good agreement with the real drilling,and the effective characterization of the 5-6 m tight thin sandstone is realized.This study provides a new method for thin reservoir prediction of tight sand gas reservoirs.
gather data optimizationcompressive sensingP-wave calibrationwaveform indication inversiontight thin reservoir prediction
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