Application Of Digital Elevation Model In 3D Seismic Exploration Acquisition Design

In order to collect 3D seismic exploration data from undulating surface(loess plateau,desert and mountainous area),it’s necessary to avoid not only surface obstacles,but also high-altitude peaks and steep slopes(that is,avoid height and steepness).The aim of this thesis is to optimize the plan of avoiding height and avoiding steep slopes in the GZH 3D exploration area of Inner Mongolia desert area,to developdigital information processing techniques and methods for terrain attribute calculation analysis and feature extraction of digital elevation model suitable for seismic exploration and acquisition design,and to do research on the application principle and method of digital topographic information in 3D seismic data acquisition and observation design of undulating surface.The design of seismic exploration observation system under the condition of desert undulating topography is analyzed and studied,which should not only fulfil the data collection in the intended main deep layer,but also be focused on avoiding large areas of high and steep dune top,steep slope,beam and other areas where the signal-to-noise ratio(SNR)is very low,in order to plan optimizing shot points of acquisition and observation for data with a low SNR.The optimal design to avoid height and steepness of seismic exploration observation system of the digital ground model based on undulating topography and special geographic information is presented.The elevation digital model and other multivariate data are used.The topographic and geomorphological information of desert features such as dune top,ridge and steep slope is vectorized,and the digital model of terrain information of 3D exploration area is established,and the information platform with optimal design to avoid height and steepness of seismic exploration observation system is provided.The optimal design scheme to avoid height and steepness of seismic exploration observation system in the whole working area of acquisition and observation system is completed,which provides a scientific basis for the decision of exploration deployment.Through the application research of the exploration target area,many technics come into being:a method of terrain recognition and vectorization of the digital elevation model is formed;based on the digital elevation model,the optimization design methods of acquisition and observation to avoid height and steepness of 3D seismic exploration and observation of undulating surface are presented,and the optimal design of GZH 3D seismic exploration observation deployment in Inner Mongolia desert area is also completed.The method to apply digital elevation model which is suitable for the optimal design to avoid height and steepnessfor 3D acquisition and observation of undulating surface conditions is found,which provides a reference for the optimal design of 3D exploration in similar areas.It also provides a basis for further research on the application of digital elevation model for 3D seismic acquisition design.