The Study Of Offshore Multi-azimuth Seismic Data Process And Reservoir Prediction Method

With the gradual refinement of exploration technology,the key point of oil and gas exploration has gradually turned to minor structural reservoir,stratigraphic reservoir and lithologic reservoir.Faced with this exploration mission narrow-azimuth exploration has been powerless.With the promotion and application of computer clusters,processing costs and cycle time of 3D seismic data have been greatly decreased,thus,seismic data processing and application of multi-azimuth have objective conditions.This study is based on seismic data of multi azimuth,it forms a set of processing and oil and gas detection technology of multi-azimuth seismic data.(1)For seismic data with different acquisition parameters,we establish a consistent processing technique system,for different azimuth angle,the method of matching and merging is developed.The focus of the dual azimuth data is good in velocity spectrum,by utilizing the data of dual azimuth,and refer to single data,velocity analysis and accurate velocity modeling can better establish the velocity of the whole work area,which improves the data imaging and the SNR and enhances the ability to identify fault,fracture and formation lithology changes.It brings a new idea for the collection and processing of 3D seismic data of offshore seismic exploration,and has a strong application value.(2)Three independent software developed by us,namely,P wave anisotropy fracture detection module,multi scale curvature fracture prediction module,nonlinear mutation fracture prediction module.The three software modules have graphical interface,and are fully compatible with Windows and Linux system.Moreover,they are easy to use,and have strong practical value.We establish the fracture prediction for multi azimuth data.The attributes of the differend azimuth data combine the advantages of the data,it can reveal the development characteristics of fault and fracture,and explains the contribution of the fracture to its pore.(3)We establish hydrocarbon detection technology for multi azimuth data,at the same time,we made a breakthrough in describing the gas geological boundary and determining the gas bearing scope.The attributes of the differend azimuth data can reveal the enrichment area of the fluid and the development characteristics of fault and fracture.And compared with the inversion results of multiple azimuth data,greatly improve the prediction reliability.(4)Our technology has been applied to multiple area in the South China Sea and East China Sea.And it has achieved very good geological effect,but also greatly improve the success rate of exploration.In short,the technology and software system adapt to the different characteristics of the area and the reservoir type.This research makes foreign companies no longer technology monopoly and has high scientific and practical value and application prospect.