可控震源模拟频谱扫描

SIMULATION OF SPECTRAL SWEEP BY VIBROSEIS

地质矿产部西南石油地质局零五工程处

由于固定函数的非线性扫描在碳酸盐岩裸露地区应用不够理想,因此提出了可控震源模拟频谱扫描方法.这种方法克服了固定函数非线性扫描在复杂地区使用的局限性,使震源扫描信号频谱更加适应探区频率响应的特点,从而使震源具有增强有效波频段的能量和压制干扰波的能力.本文主要论述这种方法的基本思想和试验效果.另外,为了进一步解决碳酸盐岩地区较突出的针对性与适应性之间的矛盾,提出了组合模拟频谱扫描方法以及应用效果.

Since the application of non-linear sweep of fixed function in the carbonate exposed areas is not ideal enough, based on which the approach, to simulate spectral sweep by VIBROSEIS is suggested.The approach has overcome the limitations appsared as the fixed function non-linear sweep used in the geologically complex areas. As a consequence, it makes the source sweep signal spectrum all the more suitable to the characteristics of frequency response of the surveyed areas. Thus it enables seismic source to be more powerful in enhancing the frequency bands of effective wave and capable of suppressing the interference wave.The paper deals mainly with the basic concepts of the recommended approach and its positive result achieved. Also, for encouraging to make continued efforts with regard to resolving the fairly visible contradiction between the objective targets and ’adaptability’, which encountered in the carbonate areas, another approach named Composite Simulation Spectral Sweeping is put forward and its substantial result is expounded.