Ray Forward The Design Of The Study And Acquisition Parameters

Data collection is the prophase of the seismic prospecting , it's very important. Design of the receiver system affects the quality of seismic collecting data directly, and affects the imaging of underground construction. The routine design of the receive system is based on the horizontal interface. It is inadaptable for the complex construction. This paper gets a good cognition and result of application through the model-forwarding, analyzing the bins of common-reflection-point(CRP) and the fold numbers of CRP bins . Geometry parameter selection was optimized.Firstly we discuss gauss ray tracing and the two-point ray racing. The gauss-ray tracing have the dynamic and geometric character. It can compose the record by calculating the high frequency wave in transverse anisotropic medium , avoiding getting the accurate ray path. It is a very steady and effective method with little calculation time and a good precision. The two point ray tracing is based on the Snell theory and the Fermat 'minimum travel time principle', which advantages is that it can calculate the accurate ray path from the source to the receiver. But it is not much adaptable in the transverse anisotropic medium.Secondly this paper study the seismic wave when it crosses the interface. When the seismic wave travel from a small wave-impedance into a big wave-impedance , the energy changes with the angle between the ray and interface. Before the angle is less than the critical angle , the reflect-coefficient is real number , when the angle reaches the critical angle , It is a complex number . Studying the rule of the reflect-coefficient at the interface , simulating the seismic wave travel in the field beyond the critical angle , analyzing the wave polarity diversification, all the work provides a theory for the wide-angle reflection .Finally with the exploration geologic structure becoming more and more difficultly , the higher request is to design the parameters of the receiver system . This paper proposes a method for optimizing the parameters of geometry system . Based on the ray tracing for the built-model , discussing and analyzing the parameters of geologic aim such as the bin size , calculating the fold of aim layer's common reflection point, comparing the fold of CRP with the fold of common mid-point, the geometry system's parameters are adjusted to improve the low fold bins , the quality of data collection and effect of exploration .