Research On Seismic Predicition Technology Of Reservoir In Nanpu No.3 Structure And Its Application

The seismic reservoir identification method and technique is a way which comprehensively uses seismic,geological and logging and other data to reveal the macro and micro space geometrical morphology(reservoir's structure morphology,thickness and extension status,and so on),and the four relationships(lithology,electrical,physical property and oil-bearing relationships between reservoirs).With the promotion of Nanpu No.3 Structure's prospecting extent,structural-lithological and lithological reservoirs of middle-deep strata have been the focus of exploration targets.During the research,the reservoir seismic prediction method to the exploration work and main problems of the Nanpu No.3 Structure's tectonic zone reservoirs,and develop effective methods of reservoir prediction which are suitable for Nanpu No.3 Structure's tectonic zone have been studied.Considering the low-resolution of seismic data and low-accuracy of fine structure characterizations in Nanpu No.3 Structure's tectonic zone,edge detection of multi-scale structure oriented gradient properties,with some seismic attributes which could reflect the fault's plane distribution,such as the maximum amplitude along the layer,half energy,instantaneous frequency and bandwidth are applied in this paper,to make it clear for the region characteristic of fracture system profile,planar features and space combination by combining technologies of the frequency-division method,seismic coherence technique.Comprehensive application of these technologies can make the interpretation of the seismic data better.Constrain least-squares spectral analysis(CLSSA)is studied to improve seismic recognition of the thin reservoir,.Model and practical application show that this method has higher frequency resolution.On the basis of fine interpretation of strata and fracture system,the well-constrained sparse pulse inversion of seismic data is conducted.On this basis,wave impedance inversion processing and attribution optimization were took,and attribute to analysis on objective layers were extracted.Then the sand body's spatial distribution of each layer were described.Above methods,the fine interpretation technique which suited the small-scale fault in middle-deep strata in Nanpu No.3 Structure's tectonic zone has been developed.Not only the methods and processes of space distribution characterization and oil-bearing prediction,but technology series of wave impedance inversion have been established.Thus,the prediction of beneficial target in the region has been completed.