地震可控震源非线性扫描应用初探

A TENTATIVE APPROACH ON SEISMIC VIBROSEIS NONLINEAR SWEEP

地矿部中国—联合国技术合作队

非线性扫描是用于可控震源地震勘探的一项新技术。它能控制输入信号的频谱,因而可用来提高输入信号的高频成份,补偿地层的衰减,提高地层分辨力;也可用来压制某一频率的规则干扰波(如面波、低频干扰)等。这对地层吸收大,低频干扰严重的地区的资料采集工作,特别是对于浅层高频地震勘探有着十分重要的意义。本文着重介绍我们在贵州南部碳酸盐岩地区的非线性扫描初步试验结果。

The "Nonlinear Sweep" is a new technique used in the "Vibroseis". It can control the frequency spectrum of input signal. So it can be used to increase the high frequency components of the input signal, compensate the attenuation of the layer and improve the resolution of the recording.Also, it can be used to suppress the disturbing wave which has a fixed frequency (e.g. ground roll, low frequency disturbance etc.). The Nonlinear Sweep is found very useful for data acquisition in the area where the stratigraphic absorption and low frequency disturbance are very serious. Especially it is true for conducting the shallow layer and high freguency seismic exploration.In this paper, the stress laid on is the description of initial test result of applying Nonlinear Sweep technigue to the carbonatite area in the southen part of Guizhou Province.