固体物理模拟实验:波场观测

Solid physical analogue test: wave field survey

中国新星石油公司石油物探研究所,南京 210014

Research Institute of Geophysical Prospecting for Petroleum, CNSPC, Nanjing 210014

在固体物理模拟测试系统上,用自制的纵、横波换能器观测了简单的层状三维固体模型的透射和反射波场,得到了几种振型的地震记录剖面。通过分析记录剖面上各种波的同相轴发现,在固体物理模拟实验中,不但能很好地记录到各种报型的主振动波场,还能接收到换能器杂振动引起的波场。这种波场既取决于换能器本身的性能,也受耦合条件的影响,而且与偏振和测试方式有关,从而加剧了固体介质中波场的复杂性。文章充分利用高性能纵、横渡换能器,着重定性地分析了各种剖面中杂振动波场的传播机理,为固体物理模型实验提供了纵、横波波场的基本特征。在国内首次给出了多种振型的固体地震模拟记录剖面。

Transmitted wave field and reflection wave field of simple stratified 3D solid model are sur-veyed with our self-made P-and S- wave transducer on a solid physics analogue test system,through the survey seismic profiles of many mode shapes are obtained. In our analysis of waveevents on the seismic profiles,it is found that the wave field resulted from stray vibration of trans-ducer can be recorded while the wave field of different mode shapes resulted from principal vibra-tion is very well recorded in the solid physics analogue study. This wave field is determined by theperformance of transducer,coupling condition,the way of polarization and test method, which com-plicates wave field in solid media. In the paper with-the full application of high performance P - andS-wave transducer the emphasis is placed on the qualitative analysis of the propagation mecha-nism of stray wave field- So the basic features of P-and S - wave field are presented for solidphysics analogue study. For the first time in our country solid seismic analogue record profiles ofmany mode shapes are obtained through our work.