Prediction technologies and its application of reservoirs for gravity flow sedimentary in the middle Third Member of Shahejie Formation in Niuzhuang Area
The gravity flow sedimentary sand bodies of in rife lake basins has various genetic types.Rapid facies transition,relatively small sedimentary scale,complex formation mechanism and distribution pattern,deter-mines the complex seismic response characteristics of this type of reservoir.In this paper,the quality of exist-ing 3D seismic data is analyzed,and the seismic data body suitable for target processing is selected for research.The polarity of seismic data of the target layer is analyzed by means of seismic response characteristics of oil shale in the fourth member of the Eocene Shahejie Formation and the multi-well calibration of positive and nega-tive polar wavelets,which lays a foundation for target processing.According to the development characteristics of turbidite sand body and its geophysical response in the middle third member of the Eocene Shahejie Forma-tion of Niuzhuang oilfield,the theoretical and practical forward models of different sand body combinations are designed.By selecting different frequency wavelets to complete the forward experiment,the reasonable para-meters are determined to complete the three-parameter wavelet high-resolution target processing method,which shows remarkable results.The following conclusions are obtained:①the high frequency components of the processed seismic data are obviously broadened compared with the old data,the compounded wave decom-position is realized,the characteristics of the wave group are clear,and the synthetic record calibration also shows that the processed data is obviously better than the original pure wave data;②After processing,the conti-nuity of the data wave group is improved,and the energy relationship is clear,which is conducive to the identifi-cation of turbidite sand and other lithology;③ The processed data is conducive to calibration.Through multi-well calibration,the fine structure model and well constraint model are established to complete seismic inver-sion,and the results are in good agreement with the actual drilling.On the basis of detailed stratigraphic divi-sion and correlation as well as geological research,the formation slice is adopted to find out the vertical develop-ment and plane distribution of the 5～8 major oil-bearing sand bodies of the middle third member of the Eocene Shahejie Formation,and expand the sand body boundary in the meantime.This research provides a new idea for the precise characterization of gravity-flow sandstone reservoirs in rife lake basins.
polarity determinationthree-parameter waveletgravity flowcompounded wave decompositionwell constrained model inversion
万方数据
维普
