Abstract:There are two problems that affect simulation of seismic geophysical model for relief surface:one is size of contact surface of source and receiver with model;the other is coupling condition between the transducer and model surface. Using single and plane layer as a model,the paper observes the feature of energy and waveform produced by plane transducer with 3mm diameter and Pwave transducer with 5mm diameter. The multiple shot records for single layer and relief surface model are obtained by the array using hemispheric transducer with 6mm diameter for transmitting (or receiving) and plane transducer with 3mm diameter for receiving (or transmitting) respectively,and following knowledge is gained:①Pointconducted mode for spherical transducer is more suitable for transmitting;transducer has better result with broaden band than with narrower band when it's used as receiver;using plane transducer with smaller diameter can achieve better experimental results. ②The source and receiver have always some size,which requires to do some reasonable smoothing for relief model to ensure the possibility of acquiring data. ③In test of single layer and relief surface model,the events of direct and surface waves are not straight line;the events of reflected Pwaves on flat bottom interface of model are also relief;the amplitudes of surface and direct waves change greatly along with the relief surface,but the amplitudes of reflection waves from bottom interface change relatively smaller;in comparison with flat layer model,there are many interference waves under the useful waves,difficult to identify their source. ④The test only uses method for layout of transducer along the relief surface when plane transducer with small size is used;the method of layout of transducer along the relief surface and method of vertical layout have similar effects for spherical transducer,but the size of spherical crust may produce error of positioning precision.
魏建新, 狄帮让. 起伏地表地震物理模型测试技术[J]. 石油地球物理勘探, 2006, 41(6): 619-624.
Wei Jian-xin, Di Bang-rang. Test technique of seismic physical model for relief surface. OGP, 2006, 41(6): 619-624.