地震勘探中次生干扰弹性动力学分析

Elastic dynamic analysis for secondary disturbances in seismic survey

西安交通大学建力学院,西安710049

School of Civil Engineering and Mechanics, Xi’an Jiaotong University, Xi’an 710049

地震勘探的次生干扰是普遍存在的,它严重影响了地震资料的品质。认识和分析这些次生干扰的内在本质和外在原因,是解决次生干扰问题的关键所在。用弹性动力学的理论,通过弹性波在波阻抗界面上的分布特点和振动系统受激励后的振动特点,对次生干扰产生的内在因素和外在客观条件进行了分析;提出了存在波动和振动两类次生干扰的观点,并对两类不同次生干扰的特点做了分析。

Secondary disturbances, which commonly exist in seismic prospecting, are harmful to seismic survey because they deteriorate the quality of seismic data. How to understand the internal and external factors that cause the secondary disturbances is the key to solve the problem. Based on the theory of elastic dynamics, the factors that cause the secondary disturbances internally and externally are discriminated through an analysis of the distribution of elastic waves at the interface of impedance and vibration characters of an excited vibrational system. Thus two types of interference are classified accordingly as fluctuation and vibration. The characters of different disturbances are discussed. Finally, an example of different secondary disturbances has been presented with real data.