The Study And Application Of Statics In Complex Area

With the development and exploration of shale gas,the static corrections have become the hot spots in south mountain regions where rich in shale gas.These regions are characterized by the large undulated terrain and the big near surface variation.Therefore,the conventional static corrections fail to eliminate the negative effects for the deep reflection caused by the complexity of the near-surface layer.In the thesis,in one hand,we study the near-surface complex mountainous model with the use of intermediate reference datum technology.Through the comparison of results,we can get some basic understanding of different intermediate reference datum parameters and further provide a reference for the statics of the real seismic data.On the other hand,in the thesis conventional high frequency static calculations fail to obtain good result in shale gas exploration in the southern mountainous area based on the first breaking times technology,which is due to the complex surface structure and the complicated relationships between the FB time and the offset.According to the characteristics of complex mountains,we explored the high frequency statics project based on the first breaking times theory for mountainous regions.The project including gather partitions and offset segments to build the fitting areas;surface fitting of the data;calculating the time difference to get the shot and receiver statics in common shot and receiver domain.Real seismic data processing verified the robustness of the project.