摘要
在准噶尔盆地内分布着多种类型的沙漠,它们占据了盆地中大部分的面积。沙漠区的中部、中南部的蜂窝状沙丘及南北向的大沙垄的地形条件最坏,使地震资料的质量受到影响。为了在此困难的地区内改进反射波法地震勘探的效果,在过去几年中进行了很多试验,取得了一定的效果.后来又在以往的测线上,采取了强化野外方法的措施,并用可控震源与炸药震源进行比较,取得了有意义的结果。进一步根据频率波数域振幅谱的分析,研究了干扰波的特征,并采取相应的二维滤波以消除干扰。同时,在频率域对叠加后的剖面进行频率扫描分析,对深层反射的低频特点的认识比以往深入一步,从而提示我们今后要在更低、更宽通频带的记录上研究它们。
Abstract
There are various types of sand dunes in Drungar Basin, distributed in a vast area of desert. Especially, in the central part of the basin, many huge sand dunes of closed shape or with North-south orientation form the worst relief in desert areas.In order to improve the quality of seismic data in above mentioned difficult areas, great efforts has been made during past several years. Recently, tests with even "stronger" field parameters with vibroseis and dynamite sources give better results than before.On the basis of this results, analysis of amplitude spectrum in F-K domain shows more detail characteristics of noises and reflections. Special measures are taken accordingly so to attenuate them and improve the S/N ratio.At the same time, frequency analysis in frequency domain reveals the extremely low frequency characteristics of deep reflections.
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