Research Of Geometry Optimizing Design Methods Based On Geology Object

Collection of seismic data, especially designing an appropriate geometry for theworking area, is the most important part in geophysical engineering, and high-qualitydata determines the results of indoor processing and interpretation. In recent years,domestic exploration gradually moves to the Midwest of our country. As commongeometry designs cannot achieve a satisfied result in complex exploration area in thewestern, the optimization of geometry design is very important and need to bereformed and innovated. Based on the illumination analysis theory, this paperanalyzes and verifies the acquisition parameters of the geometry through thesimulation results towards the underground geological targets, in order to guide theoptimizing of geometry designs, and receive high-quality seismic data and imagingresults.The traditional geometry design is based on the horizontal stack theory, and thistheory is according to the assumption of uniform horizontally layered medium. As thefocal point of the domestic exploration gradually transferring from the eastern flatlandto the western mountainous areas, the traditional geometry design method is no longerapplicable to the complex geological structure. Based on the ray theory firstly, thispaper applies the piecewise iterative method to calculate the ray paths. This methodcalculates the middle point at the random interface according to Fermat’s principle,with multiple iterations until the accuracy is satisfied. For the theoretical geologymodel, the simulation by the specific geometry is implemented, and every shot of theray paths is calculated. By studying the distribution of reflection points, it is foundthat the ray-tracing method is not fixed for the complex geological structure, and lotsof ray path is bending and distorted.For this reason, this study chooses the wave equation of the illumination analysismethod in the exploration of the complex areas, in order to achieve the optimizingdesign of the geometry for the geological targets in the complex areas. At first, we study the seismic potter, and solve the wave equation through the basic geologicalmodels. Then we descript the Kirchhoff integral solution of the wave equationanalogously according to the principle of Huygens-Fresnel, and obtain the expressionabout the source against any point in the space of the wave field. Based on this, thispaper derives the bi-directional illumination formula under this expression bybreaking down the wave downward field which sources excited and the wave upwardfield that receivers received. It could be received the wavelength of the energydistribution in the target layer interface, which is gotten by the illumination analysistowards the theory of the geological model, can be used to analyze the rationality ofthe geometry. The study forms the circuit of the geometry optimizing design based onthe geology objects.This paper uses the circuit of the geometry optimizing design to analyze atwo-dimensional model of a Zhun-dong work area in western based on theillumination of the wave equation. And according to the illumination results, thispaper analyzes the energy situation of the target layer to achieve optimized geometry.Use the optimized geometry for the data collection, we can obtain high-quality andfirst-hand information. And from the processing section, the imaging of the targetlayer is clear, and it achieves the desired effect. This paper also uses the circuit of thegeometry optimizing design to analyze a three-dimensional model of a western workarea to optimize the geometry. Firstly, using the illumination analysis of the waveequation to get the optimized geometry, we could test the rationality of the threedimensional geometry further, and then adopt the ray tracing method to execute theillumination based on the three-dimensional ray tracing for this work area. What ismore, we analyze the CRP fold of the different target layers to see its rationality, andfor the geological targets, we use the three-dimensional geometry which is finallyconfirmed. Through the obtained information from the actual three-dimensionalcollection, the data have a high quality, and the information of each target layer isrich.