Study On Attribute Analysis And Application About Multi-azimuth Seismic Data

In the field of seismic exploration and development,as to the complex structure of reservoir exploration areas,the accuracy requirement of the exploration is becoming more and more higher.So geophysicists also develop technology from 2D to 3D even 4D and 5D,in order to obtain higher accuracy of seismic data,then comprehensive analysis of the reservoir and to predict the likelihood of oil.In addition,with the old oil region in the eastern part of our country enter the middle-late of exploration,the exploration of concealed reservoir era has come,and the 3D seismic exploration technology is discovered and proved the key technology of oil and gas reservoirs,but the conventional 3D seismic exploration due to the smaller the ratio of the lateral,narrow azimuth,makes some concealed reservoir exploration to be constrained.In recent years,three dimensional wide azimuth seismic exploration technology is prove to contain more abundant information about the geological structure because of the offset from small to large,uniform distribution and the distribution comprehensive,which will have a lot of help to identify high angle fracture,fault,channel structure and so on.So that geophysicists begin to pay attention to this technology.Actual wide azimuth seismic data have the big difference with the ideal wide azimuth seismic data.In the actual collection,the uneven arrangement of shot and geophone cause bin azimuth and offset folds uneven distribution,so we need to evaluate the earthquake observation properties quantitatively in order to analysis the uniformity of bin azimuth-offset quantitatively.In my paper,four evaluation criteria are established,they are the non-uniform degree of the fold number,the non-uniform degree of the offset,the deviation of the actual offset and ideal offset,the non-uniform degree of the offset in one group.Then I calculate the four evaluation criteria and do the comprehensive evaluation to the conventional observation system.On the basis of wide azimuth seismic data,the purpose of the azimuth processing is to correctly reflect the different azimuth angles' attribution difference caused by tectonics,thus we need to eliminate the differences caused by acquisition factors of azimuth,and keep the differences caused by anisotropic characteristics of the structure.This paper established some simple models,including fracture,fault,tilted strata,channel model,and analysis the attribution difference caused by those simple models.And 3D Luojia model is established according to Luojia work area,then forward to get 3D wide azimuth data,analysis attribute differences of different offset in the same azimuth,different azimuth at the same offset and the attributes differences caused by the different structure.By analyzing the attribute differences caused by different kinds of structure,this paper give the azimuth angle division method based on the geological target and based on the actual location data in both cases.Finally,the theoretical research is applied to LJ work area and YD work area.